Fertility {AER} | R Documentation

## Fertility and Women's Labor Supply

### Description

Cross-section data from the 1980 US Census on married women aged 21–35 with two or more children.

### Usage

    data("Fertility")
    data("Fertility2")

### Format

A data frame containing 254,654 (and 30,000, respectively) observations on 8 variables.

morekids

  factor. Does the mother have more than 2 children?

gender1

  factor indicating gender of first child.

gender2

  factor indicating gender of second child.

age

  age of mother at census.

afam

  factor. Is the mother African-American?

hispanic

  factor. Is the mother Hispanic?

other

  factor. Is the mother's ethnicity neither African-American nor Hispanic, nor Caucasian? (see below)

work

  number of weeks in which the mother worked in 1979.

### Details

`Fertility2` is a random subset of `Fertility` with 30,000 observations.

There are conflicts in the ethnicity coding (see also examples). Hence, it was not possible to create a single factor and the original three indicator variables have been retained.

Not all variables from Angrist and Evans (1998) have been included.

### Source

Online complements to Stock and Watson (2007).

### References

Angrist, J.D., and Evans, W.N. (1998). Children and Their Parents' Labor Supply: Evidence from Exogenous Variation in Family Size American Economic Review, 88, 450–477.

Stock, J.H. and Watson, M.W. (2007). Introduction to Econometrics, 2nd ed. Boston: Addison Wesley.

### See Also

`StockWatson2007`

### Examples

    data("Fertility2")

    ## conflicts in ethnicity coding
    ftable(xtabs(~ afam + hispanic + other, data = Fertility2))

    ## create convenience variables
    Fertility2$mkids <- with(Fertility2, as.numeric(morekids) - 1)
    Fertility2$samegender <- with(Fertility2, factor(gender1 == gender2))
    Fertility2$twoboys <- with(Fertility2, factor(gender1 == "male" & gender2 == "male"))
    Fertility2$twogirls <- with(Fertility2, factor(gender1 == "female" & gender2 == "female"))

    ## similar to Angrist and Evans, p. 462
    fm1 <- lm(mkids ~ samegender, data = Fertility2)
    summary(fm1)

    fm2 <- lm(mkids ~ gender1 + gender2 + samegender + age + afam + hispanic + other, data = Fertility2)
    summary(fm2)

    fm3 <- lm(mkids ~ gender1 + twoboys + twogirls + age + afam + hispanic + other, data = Fertility2)
    summary(fm3)

[Package AER version 1.2-5 Index]