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The EFFECT OF MATERNAL DRUG USE ON BIRTH WEIGHT:

The EFFECT OF MATERNAL DRUG USE ON BIRTH WEIGHT:. MEASUREMENT ERROR IN BINARY VARIABLES. INTRODUCTION.

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The EFFECT OF MATERNAL DRUG USE ON BIRTH WEIGHT:

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  1. The EFFECT OF MATERNAL DRUG USE ON BIRTH WEIGHT: MEASUREMENT ERROR IN BINARY VARIABLES

  2. INTRODUCTION • Joyce(1990) and Joyce, Racine and Mocan (1992) show that the dramatic rise in the aggregate rate of low birth weight among blacks in New York city between 1984 and 1988 is directly associated with the rise in illicit drug use. • According to Joyce , Racine and Mocan the estimates of self- reported prenatal drug use on birth weight are biased upwards by measurement error..

  3. PURPOSE • The primary purpose of this paper is to find the ways to correct for bias in the coefficients obtained from observed measure of prenatal illicit drug use on infant health. • The standard assumption that measurement error is random is relaxed. • The measurement error is discussed in the context of binary variables.

  4. The Model • This empirical model consists of structural production of infant health, where birth weight is used as a measure of infant health. • (1) Wi=B0 +B1Mi +B2Di +e • (2) di= Di-ui • (3) Wi=B0+B1Mi+B2di +B3ui +e • (4)Wi=a0+a1Mi +a2di+e

  5. Results • . (1) (2) (3) (4) (5) (6) (7) Any Drug Use -.104 -.072 (.021) -.057 (.024) Actual Use -.079 (.037) -.089 (.037) -.310 (.123) -.080 (.037) Reported

  6. Conclusion • In examining the effects of maternal drug use on birth weight , it was found out that observed maternal drug use results in an over estimate of the actual effect of drug use on birth weight. Using a predicted measure ,the true effect of drug use on birth weight was closely approximated.

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