Gray, Jo Anna

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Browsing Gray, Jo Anna by Subject "Fertility"

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    Cohort Effects on Nonmarital Fertility
    (University of Oregon, Dept of Economics, 2007-05) Stockard, Jean; Gray, Jo Anna; O'Brien, Robert; Stone, Joe A.
    The authors employ a newly developed method to disentangle age, period and cohort effects on nonmarital fertility ratios (NFR) from 1972 to 2002 for U.S. women aged 20-44 – with a focus on three specific cohort factors: family structure, school enrollment, and the ratio of men to women. All play significant roles in determining NFR and vary substantially for whites and blacks. Indeed, if black women and white women had cohort characteristics typical of the other group, age-specific NFRs for black women would decline markedly, while those for whites would increase markedly. Hence, cohort related variables contribute substantially to black-white differences in NFR in adulthood. Early family structure and education are particularly crucial in the racial differences. Most distinctively, while the impact of school enrollment on NFR is significantly negative for whites, the impact is significantly positive for blacks, perhaps due to the dominance of the “independence” effect.
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    Race Differences in Cohort Effects on Nonmarital Fertility in the United States
    (University of Oregon, Dept of Economics, 2008-01) Stone, Joe A.; Gray, Jo Anna; Stockard, Jean; O'Brien, Robert
    We employ newly developed methods to disentangle age, period and cohort effects on nonmarital fertility ratios (NFRs) from 1972 to 2002 for black and white women aged 20-44 in the United States. We focus on three cohort factors: family structure, school enrollment, and the sex ratio. For both blacks and whites, cohorts with less traditional family structures have higher NFRs. Other results differ by race. The impact of school enrollment on NFRs is significantly negative for whites, but significantly positive for blacks. The impact of sex ratio is significantly negative for blacks, but insignificant for whites. If black women and white women had cohort characteristics typical of the other group, age-specific NFRs for black women would decline markedly, while those for whites would increase markedly.
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    The Rising Share of Nonmarital Births Fertility Choice or Marriage Behavior? Response to Ermisch, Martin, and Wu*
    (Department of Economics, University of Oregon, 2008-09) Stone, Joe A.; Stockard, Jean; Gray, Jo Anna
    In a 2006 article in Demography, Jo Anna Gray, Jean Stockard and Joe Stone (GSSi)observe that among black women and white women ages 20 to 39, birth rates increased sharply for unmarried women over the period 1974 to 2000. But they also increased for married women, as well, and yet the total birth rate for married and unmarried women combined was essentially unchanged; ii)conclude that's since the total birth rate did not change, it seems obvious by inspection that the rises in unmarried and married birth rates could not have come from a general rise in fertility among women 20-39; iii)argue that these patterns are an example of a phenomenon called "Simpson's paradox", often illustrated by a joke, as told at Harvard, that when a student transfers from Harvard to Yale, mean intelligence rises at both places. Both means rise not because the average intelligence of the combined student bodies changed, but because the composition of the student body changed at each school; iv) conclude that between 1974 and 2000, sharp increases in the proportion of women who were single, termed the single share, or Su, changed the composition of the pools of married and unmarried women. The rising single share had a selection effect on the pools of married and unmarried women akin to the hypothetical student transfer from Harvard to Yale. Women with target fertility below the average for married women, but above the average for unmarried women, became less likely to marry than previously, so that mean birth rates for both groups rose over the period, and iv) using age/race-specific panel data, find parameter values strikingly consistent with those predicted by their illustrative model, and a dominant role for the selection effect of the single share in determining NFR on this. Recently Ermisch Martin and Wu (EMW) have challenged the GSS findings and conclusions. In this response GSS respond to the EMW challenges, and reaffirm the GSS results and conclusions.
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    The rising share of nonmarital births: A response to Ermisch, Martin, and Wu
    (University of Oregon, Dept of Economics, 2008-09) Gray, Jo Anna; Stockard, Jean; Stone, Joe A.
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    The Rising Share of Nonmarital Births: Fertility Choices or Marriage Behavior?
    (University of Oregon, Dept of Economics, 2004-11-01) Gray, Jo Anna; Stockard, Jean; Stone, Joe A.
    Much of the sharp rise in the share of nonmarital births in the United States has been attributed to changes in the fertility choices of unmarried and married women - in response, it is often argued, to various public policies. In contrast, we develop and test a model that attributes the rise to changes in marriage behavior, with no changes in fertility. A variety of empirical tests strongly supports this conclusion and invites focused attention to issues related to marriage behavior, as well as the interactions between marriage and fertility.
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    A tale of two shares: The relationship between the “illegitimacy” ratio and the marriage share
    (University of Oregon, Dept of Economics, 2004-06-11) Gray, Jo Anna; Stockard, Jean; Stone, Joe A.
    We develop a model of fertility and marriage that implies a magnified effect of marriage rates on the share of births to unmarried women. For U.S. data, plots and regression estimates support the prediction that the share of unmarried births is driven primarily by the square of the share of unmarried women. Our findings suggest that some of the emphasis on changes in fertility behavior in explaining the rising share of births to unmarried women might be productively redirected toward exploring the role and determinants of changes in marriage behavior. Moreover, previous studies of fertility behavior, to the extent that marital status is taken as given, may confound fertility and marriage behavior.