Stochastic duration and dynamic measure of risk in financial futures

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1063 COPY 2

FACULTY WORKIxNG
PAPER NO. 1063

Stochastic Duration and Dynamic iMeasure cf
Risk in Financial Futures

Andrew H. Chen
Hun Y. Park
K. John Wei

SEP"188* .

College of Commerce and Business Administration
Bureau of Economic and Business Research
University of Illinois, Urbana-Champaign

BEBR

FACULTY WORKING PAPER NO. 1063
College of Commerce and Business Administration
University of Illinois at Urbana-Champaign
July 1984

Stochastic Duration and Dynamic Measure of
Risk in Financial Futures

Andrew H. Chen
Southern Methodist University

Hun Y. Park, Assistant Professor
Department of Finance

K. John Wei
University of Mississippi

Digitized by the Internet Archive

in 2011 with funding from

University of Illinois Urbana-Champaign

http://www.archive.org/details/stochasticdurati1063chen

Abstract

Combining the contributions of Cox, Ingersoll and Ross (1979, 1981)
in stochastic duration of bonds and in equilibrium pricing of futures
contracts, this paper develops stochastic duration as a dynamic risk
measure for financial futures. Some simulation results are provided and
discussed.

Stochastic Duration and Dynamic Measure Of
Risk In Financial Futures

The introduction of futures contracts on several financial instru-
ments into the exchanges in the recent years has generated a great deal
of interests in studying the role of financial futures. Most of the
studies on financial futures have focused either on the empirical inves-
tigation of hedging effectiveness of financial futures or on deriving
optimal hedge-ratios in immunization strategies with financial futures
using Macaulay's duration as a risk measure. To the best of our knowl-
edge, no study on financial futures to date has explicitly examined the
validity of using the traditional duration or proposed any alternative
risk measure in the immunization strategies with financial futures.

As Leibowitz (1981) has demonstrated, there are two basic kinds of
yield-curve movements — parallel market shifts and yield-curve reshapings —
and they lead to fundamentally different types of volatility behavior in
the prices of financial futures. In particular, the prices of financial
futures have been shown to be extremely sensitive to the yield-curve re-
shapings even when the cash security's yield remains unchanged. The risk
embedded in a financial futures contract is not the same as that of a
cash security. Therefore, determining a proper risk measure in financial
futures is of significant importance if we attempt to devise effective
hedging strategies with financial futures in the management of bond port-
folios.

The traditional measures of duration, developed by Macaulay (1938)
and Hicks (1939), have been used as measures of basis risk of bonds and
as means to devise immunization 'strategies for bond portfolio management.

-2-

The concept of traditional measures of duration has also been extended

to assess the risk, of other financial assets such as common stocks and

2
financial futures." However, as Cox, Ingersoll and Ross (1979) (CIR

hereafter), and Ingersoll, Skelton and Weil (1978) have pointed out, the
traditional duration is a valid risk measure only for parallel shifts in
the entire yield-curve (i.e., preserving yield-curve shapings). There-
fore, applying the traditional measures of duration to financial futures
for immunization strategies (e.g., Chance (1982), and Kolb and Chiang
(1982)) might lead to improper results. CIR (1979) has developed a
"stochastic duration" which has been shown to be a superior alternative
for measuring the basis risk of bonds.

The purpose of this paper, combining the contributions of CIR (1979,
1981) in the stochastic duration of bonds and in the equilibrium pricing

of futures contracts, is to develop stochastic duration as a dynamic

3
risk measure for financial futures. It is our hope that this paper

will increase the understanding about the risk of financial futures and

thus give some insights for more efficient immunization strategies in

bond portfolio management. Section I reviews the literature on duration

of bonds. Section II develops the stochastic duration of financial

futures and shows some simulation results. Section III contains a brief

summary.

I. Duration of Bonds: Literature Review
Duration of a bond, originally developed by Macaulay and Hicks,
ed as a weighted average of times to maturity. The weight
assigned to each period is the present value of the cash flow for that
od divided by the current price of the security as follows:

-3-

D = 2 tC(t)P(t)/2 C(t)P(t) (1)

where C(t) is the stream of cash flows (coupons and principal repay-
ment) and P(t) is the present value of $1.00 to be received at time t.
Duration in (1) can also be expressed in the form of an elasticity:

-D = [(dB/B)/(dy/y)]/y = [dB/B] • [1/dy] (2)

— yt
where B = Z C(t)e and y is the continuously compounded yield-to-
maturity on the bond.

CIR (1979) has demonstrated that measuring the risk of a bond by
the elasticity given in (2), which is common in the bond market, is
faulty since the result in (2) cannot be used to make cross-sectional
comparisons of the riskiness of bonds (p. 52). In addition, Ingersoll,
Skelton and Weil (1978) has proved that the duration in (1) can be a
valid risk measure only when the entire yield curve is described by
proportional shape-preservation under interest rate changes (see also
CIR (1979) and Bierwag, Kaufman and Toevs (1982)). Thus it would be
misleading if we apply the concept of the traditional duration directly
to the financial futures contract since, as Leibowitz (1981) has shown,

the futures price is more sensitive to yield curve reshapings than to

4
parallel shifts.

As an alternative, CIR (1979) has proposed stochastic duration as
a dynamic measure of risk of bonds with units of time. This concept
of duration allows the yield curve changes in shape as well as location,
To derive the stochastic duration, CIR assumed that the instantaneous
compounding risk-free interest rate, r, follows the first-order auto-
regressive process as

-£-

dr = <(u - r)dt + a/7 dz (3)

where 1J is steady— state mean and < is the parameter for the speed of
adjustment toward u.

Based upon a general process for interest rate in (3), they derived
the stochastic duration as a proxy for basis risk of coupon bonds with
the units of time as follows:

D = G_1[-Br/B] = G_1[-E C(t)Pr(t)/2 C(t)P(t)] (4)

= G_1[E C(t)P(t)C(t)/S C(t)P(t)]

where P(t) = the price of a unit discount bond with time to maturity T

= A(T)exp[-rG(t)]

f ] 2<u/o2

., , ) 2y exp[(Y + < + X)x/2] {

K J |(Y - < + X)[exp(YT) - 1] + 2Yf

G(t) = 2/[< + X + Y Coth(YT/2)]
Y - [(< + X)2 + 2a2]1/2
-a = the parameter for the market's liquidity preference

r~1f \ 2 r .K_ir2 K + X"
G (x; = — Coth

Y LTx Y

CIR (1979) has compared the traditional duration in (1) with the
stochastic duration in (4), and concluded that the traditional duration
is not theoretically and empirically realistic.

II. Stochastic Duration of Financial Futures
Taking into account the marking-to-market effect in futures con-
explicitly, CIR (1981) has derived the equilibrium pricing for-
mula for the futures contract on a unit discount bond.

-5-

Let F(t,A) be the futures price as of time t for a contract with
the maturity date s on a discount bond paying one dollar at time T
(t < s < T), and let A = T - s and T = T - t to be consistent with the
notation in section I. Then the equilibrium price of this futures con-
tract is as follows:

F(t,A) = A(A)

where n(s-t) =

n(s-t)

G(A) + n(s-t)

2(< + X)

2<M/a

• exp

l(s-t)G(A)e-(<+X)(s-t)l
1 G(A) + n(s-t)

2M -(<+X)(s-tK

a (1 - e )

Using (4) and (5), the stochastic duration of the futures contract on

the discount bond (D^) can be derived as

F

D i G 1[-F /F]

r r

= G

-1

n(s-t)-G(A)e

-(<+X)(s-t)

G(A) + n(s-t)

(6)

= G X(x)

(5)

We can also develop the pricing formula for a futures contract on
a coupon bond since a coupon bond can be regarded as a portfolio of
discount bonds. Consider a coupon bond which pays n constant coupons
(C) with tfhe equal time interval (5) for the period A = T - s and prin-
cipal of one dollar at time T, i.e., A/6 = n. This coupon bond can be
thought of as a portfolio of n discount bonds (i = l,2,...,n). Let
F(t,iS) be the futures price on ith discount bond. The futures price
on the coupon bond as of time t (f(t)) can be written as

f(t) =

-6-

C Z F(t,iS) + F(t,n<5)
i=l

(7)

= C Z A(i5)
i=l

— ,2<p/a*

n(s-t)

G(i6) + n(s-t)

exp

ln(s-t)G(i6)e-(<+A)(s-t)[
G(iS) + n(s-t) C

+ F(t,n5)

Following the same procedure, using (4) and (7), the stochastic dura-
tion of the futures contract on a coupon bond can be written as

Df = G'Vfr/f]

- G

-1

CZF(t,l6)(T'(s-t>G^g^"(^)CS"t)| + F(t n,wn(S-t)G(n6)e-(<+X)

! ! G(i6) + n(s-t) ! + ^W G(n6) ; n(s_t)

)(s-t)

1

CEF(t,i6) + F(t,n6)

- G"1(x)

Equation (3) is the general form of stochastic duration for finan-
cial securities. For instance, if C is zero for discount bonds, then
(8) reduces to (6) and we have Df = Dp. In addition, when t is equal

s, a futures contract on a coupon bond becomes a cash coupon bond
and thus (8) reduces to (4).

Although the results in (6) and (8) appear to be complicated, their
•ractical application is not as restrictive as it Looks once the Para-

of the interest rate process in (3) are estimated. For illustra-
ion, we have simulated the stochastic durations of financial futures
using the parameter values in (3) estimated by CIR (1979).
Lme series of the weekly auction rates on 91-day Treasury bills
76, CIR has estimated < = .692, p = 5.623%, and a2 = .00608.

-7-

Table 1 presents the simulation results on stochastic durations of
futures contracts on discount bonds and coupon bonds with varying coupon
rates and time periods. We have assumed M = r and X (liquidity premium)
= 0 to see only the effects of uncertainty. We have also used the re-
version parameter, < = .692, in order to highlight the effect of interest
rate process with drift affecting the shape as well as the location of
the yield curve, as opposed to the random walk with zero drift affecting
the location only.

Table 1 demonstrates that the stochastic duration of futures con-
tracts on bonds decreases as coupon rate increases, which is consistent
with the duration of cash bonds. It also shows that as s-t becomes
longer for the given period of A, the stochastic duration becomes
smaller. This result is not surprising, since the futures contract as
of time t with the maturity date s on a bond maturing at time T can be
viewed conceptually as a portfolio going long in the bond with the
maturity date T and at the same time going short in the bond maturing
at time s. Thus, the duration of the futures contract can be inter-
preted as the difference between the duration of the bond maturing at
time T and the duration of the bond maturing at time s. In addition,
the results in Table 1 are consistent with the notion of CIR (1979)
that the stochastic duration need not be an increasing function of
maturity.

However, Table 1 is not directly comparable to CIR (1979) because
of the different underlying securities. Table 2 presents an indirect
comparison between the stochastic duration of cash bonds reported in
CIR (1979) and the stochastic duration of futures contracts on the same

-3-

bonds when Che time period until the maturity of the futures contracts
is extremely short. As expected, under this circumstance, they are
quite similar.

It is, however, important to note that the stochastic duration of
financial futures developed in this paper is very sensitive to the
reversion parameter. Table 3 demonstrates the sensitivity of the
stochastic duration to the reversion parameter <, This clearly indi-
cates that the effectiveness of the stochastic duration for practical
applications critically depends on correct estimates of parameters in
the interest rate process specified in (3).

Once the aforementioned stochastic durations for cash bonds and the
futures on the bonds are estimated, they can be utilized to calculate
the hedge ratios in the immunization strategies with financial futures.
Since the stochastic duration for financial futures developed in this
paper allows for parallel shifts as well as reshapings in the yield-
curve, it must be a better risk measure and it will provide a more
effective means in immunization strategies for bond portfolio manage-
ment. However, the focus of this paper is on developing stochastic
duration as dynamic measure of risk, of financial futures and thus the
effectiveness of the stochastic duration for such practical application
is beyond the scope of the current paper.

III. Conclusion

The concept of duration has been commonly used as a measure of
basis risk of bonds. However, the usefulness of the traditional dura-

i and its extentions is restrictive both theoretically and empiri-
cally because they are valid only for parallel market shifts in the

-9-

entire yield curve. Since the prices of financial futures contracts
are very sensitive to yield-curve reshapings, the traditional duration
provides little usefulness in immunization strategies with financial
futures. We have developed stochastic duration of a financial futures
contract as a proxy for its dynamic measure of risk, based on a more
realistic interest rate process allowing changes in shape as well as
location of the yield curve suggested by CIR (1979). The simulation
results confirm the validity of the aforementioned stochastic duration
as a risk measure for financial futures.

-10-

Footnotes

1See Bacon and Williams (1976), Chance (1982, 1983), Ederington
(1979), Hill and Schneeweis (1980), and Kolb and Chiang (1981, 1982).

2
See Boquist, Racette and Schlarbaum (1975), Bierwag (1977), Bierwag

and Kaufman (1979), Chance (1982, 1983), Khang (1979), Kolb and Chiang

(1981, 1982), and Williams and Pfeiger (1982).

3
Futures contracts do not require initial investment. Therefore it

seems difficult to interpret the duration of futures contracts. How-
ever, as CIR (1981) and Ingersoll (1982) pointed out, although not the
price of an asset, a futures price satisfies the same equilibrium as
asset prices. The payoffs of a futures contract can be duplicated by a
portfolio containing call and put options (see Black (1976)). Also, a
futures contract can be interpreted as a portfolio yielding positive and
negative cash flows (see Little (1984)): "A long position implies an
outflow at the delivery date and subsequent inflows from Che delivered
instrument" (pp. 285). In any case, the duration of a futures contract
can be defined as the duration of an asset, in much the same manner as
wealth fractions of futures contracts in investors portfolio are defined
in the literature (see Breeden (1979)).

4
See Kolb and Chiang (1982) for application of the concept of

Macaulay's duration to futures contracts.

All arguments about futures contracts (including derivation of
stochastic duration) have been done also for forward contracts. The
results on forward contracts are not reported here but will be avail-
able upon request.

6
Note that the duration of a futures contract on the discount bond

is not equivalent to the duration of the discount bond itself which is

equal to the maturity. Also, the correctness of (6) can be easily

checked by deriving the duration of cash discount bond with the

maturity, s-t

D _ G-l C(s)P(s-t)G(s-t)

s C(s)P(s-t)

= G"1[G(s-t)]

= s-t

'See CIR (1979) for the effect of <.

8
See Little (1984) for the interpretation of futures contracts in

much the same wav.

-11-

Ref erences

Bacon, P. and Williams, R. 1976. "Interest Rate Futures: New Tool
for the Financial Manager," Financial Management (Spring): 32-38.

Black, F. 1976. "The Pricing of Commodity Contracts," Journal of
Financial Economics 3: 169-179.

Boquist, J. A., Racette, G. A., and Schlarbaum, G. G. 1975. "Duration
and Risk. Assessment for Bonds and Common Stocks," Journal of
Finance 30: 1360-1365.

Bierwag, G. 0. 1977. "Immunization, Duration and the Term Structure
of Interest Rates," Journal of Financial and Quantitative Analysis,
Vol. 12 (December): 725-742.

and Kaufman, G. G. 1979. "Coping with the Risk of Interest

Rate Fluctuations: A Note," Journal of Business, Vol. 50 (July):
364-370.

and Toevs, A. L. 1982. "Single Factor Duration Models in a

Discrete General Equilibrium Framework," Journal of Finance 37:
325-338.

Breeden, D. T. 1979. "Futures Markets and Commodity Options," working
paper, University of Chicago.

Chance, D. M. 1982. "An Immunized-Hedge Procedure for Bond Futures,"
Journal of Futures Markets, Vol. 2: 231-242.

. 1983. "Floating Rate Notes and Immunization," Journal of

Financial and Quantitative Analysis 18 (September): 365-380.

Cox, J. C. , Ingersoll, J. E. Jr., and Ross, S. A. 1978. "A Theory cf
the Term Structure of Interest Rates," Graduate School of Business,
Stanford University.

'. 1979. "Duration and the Measurement of Basic Risk,"

Journal of Business 52: 51-61.

1981. "The Relation Between Forward Prices and Futures

Prices," Journal of Financial Economics 9: 321-346.

Ederington, L. H. 1979. "The Hedging Performance of the New Futures
Markets," Journal of Finance 34 (March): 157-170.

Hicks, J. R. 1939. "Value and Capital." Oxford, Clarendon Press.

-12-

Hill, J. and Schneeweis, T. 1980. "The Use of Interest Rate Futures
in Corporate Financing and Corporate Security Investment," pro-
ceedings of the International Research Seminar of the Chicago Board
of Trade (May).

Ingersoll, J. E. 1982. Discussion on "The Pricing of Commodity-Linked
Bonds," by E. S. Schwartz, Journal of Finance 37: 540-541.

, Skelton, J., and Weil, R. 1978. "Duration Forty Years

Later," Journal of Financial and Quantitative Analysis 13
(November): 627-650.

Khang, C. 1979. "Bond Immunization When Short-term Interest Rates
Fluctuate More Than Long-terra Rates," Journal of Financial and
Quantitative Analysis 14: 1085-1090.

Kolb, R. and Chiang, R. 1981. "Improving Hedging Performance Using
Interest Rate Futures," Financial Management 10: 72-79.

. 1982. "Duration, Immunization and Hedging with Interest

Rate Futures," Journal of Financial Research 5: 161-168.

Leibowitz, M. L. 1981. "The Analysis of Value and Volatility in
Financial Futures," Monograph of Solomon Brothers.

Little, P. K. 1984. "Negative Cash Flows, Duration and Immunization:
A Note," Journal of Finance 39: 283-288.

Macaulay, F. R. 1938. "Some Theoretical Problems Suggested by the
Movements of Interest Rates, Bond Yields and Stock Price Since
1856," National Bureau of Economic Research, New York.

Williams, A. 0. and Pfeiger, P. E. 1982. "Estimating Security Price
Risk Using Duration and Price Elasticity," Journal of Finance 37:
399-412.

D/206

Table 1

Stochastic Duration of Futures Contracts on
Discount Bonds and Coupon Bonds*

s-t
(Year)

.25
.25
.25

.25
.25
.25
.25
.25
.25
.25
.25
.50
.50
.50
.50
.50
.50
.50
.50
.50
.50
.50
.50
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
1.00
1.00
1.00
1.00
1.00
1.00
1.00

T-s=
(Ye

s=A |

aar) f~

0%

.25
.50
.75
1.00
1.50
1.75
2.00
5.00
10.00
15.00
20.00
.25
.50
.75
1.00
1.25
1.50
1.75
2.00
5.00
10.00
15.00
20.00
.25
.50
.75
1.00
1.25
1.50
1.75
2.00
5.00
10.00
15.00
20.00
.25
.50
.75
1.00
1.25
1.50
1.75

.2072

.2072

.4079

.4058

.6013

.5947

.7866

.7733

1.1304

1.0966

1.2876

1.2404

1.4345

1.3719

2.4144

2.1488

2.6186

2.2591

2.6252

2.2469

2.6254

2.2345

.1722

.1722

.3348

.3331

.4872

.4821

.6289

.6189

.7599

.7435

.8799

.8559

.9890

.9566

1.0875

1.0459

1.6541

1.5167

1.7512

1.5752

1.7542

1.5689

1.7543

1.5623

.1434

.1434

.2761

.2747

.3978

.3938

.5086

.5008

.6088

.5963

.6986

.6808

.7786

.7550

.8495

.8197

1.2285

1.1412

1.2884

1.1787

1.2902

1.1747

1.2903

1.1705

.1197

.1197

.2285

.2274

.3267

.3235

.4147

.4086

.4930

.4833

.5622

.5486

.6229

.6051

Coupon Rates

.2072

.2072

.4047

.4037

.5916

.5886

.7671

.7611

1.0815

1.0673

1.2196

1.2004

1.3449

1.3204

2.0613

1.9916

2.1733

2.1128

2.1793

2.1354

2.1819

2.1499

.1722

.1722

.3323

.3315

.4797

.4773

.6142

.6097

.7360

.7288

.8451

.8350

.9422

.9289

1.0278

1.0112

1.4688

1.4296

1.5299

1.4971

1.5331

1.5094

1.5345

1.5173

.1434

.1434

.2740

.2734

.3918

.3900

.4972

.4937

.5906

.5852

.6728

.6652

.7445

.7348

.8067

.7947

1.1100

1.0843

1.1497

1.1285

1.1518

1.1365

1.1527

1.1416

.1197

.1197

.2268

.2263

.3219

.3205

.4057

.4029

.4789

.4747

.5424

.5366

.5971

.5897

Table 1 (cont. )

s-t

T-s=A
(Year)

ConDon

Rates

(Year)

0%

4%

6%

H%

1.00

2.00

.6760

.6538

.6440

.6350

1.00

5.00

.9484

.8875

.8654

.8471

1.00

10.00

.9895

.9138

.8934

.8785

1.00

15.00

.9907

.9110

.8949

.8841

1.00

20.00

.9908

.9080

.8955

.8877

1.25

.25

.1000

.1000

.1000

.1000

1.25

.50

.1897

.1887

.1883

.1879

1.25

.75

.2695

.2669

.2657

.2645

1.25

1.00

.3402

.3353

.3330

.3308

1.25

1.25

.4024

.3948

.3912

.3879

1.25

1.50

.4567

.4461

.4412

.4367

1.25

1.75

.5040

.4901

.4839

.4782

1.25

2.00

.5449

.5278

.5203

.5133

1.25

5.00

.7490

.7042

.6879

.6743

1.25

10.00

.7790

.7236

.7086

.6976

1.25

15.00

.7799

.7216

.7097

.7017

1.25

20.00

.7799

.7194

.7102

.7044

*The value of parameters used in this table are r = p = 5.623%,

a - .00608 and < = .692.

Table 2

Stochastic Duration of Futures Contracts on Coupon Bonds
When s-t is Extremely Short Relative to A*

T-s=A
(Year)

Coupon

Rates

s-t

4%

6%

8%

(Year)

Futures

CIR

Futures

CIR

Futures

CIR

.01

5

3.67

3.81

3.41

3.52

3.23

3.34

.01

10

4.10

4.29

3.79

3.93

3.60

3.73

.01

15

4.05

4.24

3.81

3.95

3.66

3.81

.01

20

4.00

4.18

3.82

3.96

3.71

3.86

*Assumed that u = r - 5.623%, a*" = .00608 and < = 0.692. The column,
CIR presents the stochastic duration of cash coupon bonds with time to
maturity, A, which was calculated by CIR (1979).

Table 3

Stochastic Duration of Futures Contracts on
Discount Bonds for Different Values of <

s-t

T-s=A

(Year)

(Year)

< - .001

< = .100

< = .692

.25

.25

.2499

.2437

.2072

.25

.50

.4997

.4872

.4079

.25

1.00

.9990

.9733

.7866

.25

4.00

3.9867

3.8640

2.2281

.25

20.00

19.5546

17.3795

2.6254

.50

.25

.2498

.2376

.1722

.50

.50

.4994

.4747

.3348

.50

1.00

.9980

.9473

.6289

.50

4.00

3.9734

3.7341

1.5590

.50

20.00

19.1352

15.5427

1.7543

.75

.25

.2497

.2316

.1434

.75

.50

.4991

.4625

.2761

.75

1.00

.9970

.9221

.5086

.75

4.00

3.9602

3.6099

1.1684

.75

20.00

18.7390

14.1363

1.2903

1.00

.25

.2496

.2258

.1197

1.00

.50

.4987

.4507

.2285

1.00

1.C0

.9960

.8977

.4147

1.00

4.00

3.9471

3.4911

.9066

1.00

20.00

18.3639

13.0022

.9908

1.25

.25

.2495

.2201

.1000

1.25

.50

.4984

.4391

.1897

1.25

1.00

.9950

.8739

.3402

1.25

4.00

3.9341

3.3772

.7184

1.25

20.00

18.0078

12.0560

.7799

HECKMAN IX
BINDERY INC. |S

JUN95

R a To Plc^f N. MANCHESTER,
Bound -To -llcasi- |ND|ANA 46962