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Examining Same-Sex Couples Using Dyadic Data Methods

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Analytical Family Demography

Abstract

The increasing availability of population-level data on same-sex couples has given family demographers greater insight into the characteristics of same-sex couples in the United States as well as the implications of gender and sexuality for individual well-being across multiple outcomes. Whereas most nationally representative research on same-sex couples focuses on individuals, surveys such as the National Health Interview Survey (NHIS) can be used to construct couple-level data files, enabling researchers to consider how couple-level indicators and variables for both partners affect individual well-being. In this chapter, we detail the benefits of dyadic data methods for research on couples and demonstrate a dyadic data analysis of 1262 same-sex couples and 113,642 different-sex couples derived from the 2012 to 2016 NHIS person-level files. Specifically, we examine the effects of respondent gender × partner gender on: reported health status; partner education and reported health; and union status and reported health among those in same-sex versus different-sex couples. Our results suggest that analysis of same-sex couples using dyadic data methods yields more nuanced results than analyses of individuals. For instance, there is a significant positive association between partner college degree and reported health status that is greater in magnitude for women than men—but only if women are in different-sex relationships. In addition, cohabitation and marriage are similarly associated with health for men in same-sex relationships, but cohabitation is associated with poorer health for men and women in different-sex relationships. We conclude with suggestions for future research using dyadic data methods for research on couples.

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Notes

  1. 1.

    This also implies that standard panel-data regression approaches may be adapted for this purpose.

  2. 2.

    The results for the ordered probit models are available upon request.

  3. 3.

    Stata and R code for carrying out this analysis is available in the Appendix.

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Correspondence to Rhiannon A. Kroeger .

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Appendix 1: Syntax for Regression Analyses

Appendix 1: Syntax for Regression Analyses

1.1 Stata Syntax

*Empty Model for ICC mixed health || cid:, cov(exc) reml estat icc ****************************************************************** *Table 3 sort cid pid *M0 empty mixed health || cid:, nocon res(exc) reml

*M1 No Controls- No Interaction mixed health i.fem i.pfem || cid:, nocon res(exc) reml outreg2 using "table3", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) replace

*M2 No Controls- Add Interaction mixed health i.fem##i.pfem || cid:, nocon res(exc) reml outreg2 using "table3", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append

*WM lincom _cons+1.fem *MW lincom _cons+1.pfem *WW lincom _cons+1.fem+1.pfem+1.fem#1.pfem

*M3 Add dyad level control vars mixed health i.fem##i.pfem i.cohab i.numkids || cid:, nocon res(exc) reml outreg2 using "table3", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append

*M4 Add Respondent Controls mixed health i.fem##i.pfem i.cohab i.numkids i.coldeg i.race c.cage_p || cid:, nocon res(exc) reml outreg2 using "table3", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append

*M5 Add Partner Controls mixed health i.fem##i.pfem i.cohab i.numkids i.coldeg i.race c.cage_p /// i.coldeg_pid i.race_pid c.cage_p_pid || cid:, nocon res(exc) reml outreg2 using "table3", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append ***************************************************************** *Table 4 *M1- no interactions: mixed health i.fem i.pfem i.coldeg_pid i.coldeg i.race i.race_pid /// c.cage_p c.cage_p_pid i.cohab i.numkids || cid:, nocon res(exc)reml outreg2 using "table4", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) replace *M2- fem##coldeg mixed health i.fem i.pfem i.coldeg_pid i.fem##i.coldeg_pid i.coldeg i.race i.race_pid /// c.cage_p c.cage_p_pid i.cohab i.numkids || cid:, nocon res(exc) reml outreg2 using "table4", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *M3- pfem##coldeg mixed health i.fem i.pfem i.coldeg_pid i.pfem##i.coldeg_pid i.coldeg i.race i.race_pid /// c.cage_p c.cage_p_pid i.cohab i.numkids || cid:, nocon res(exc) reml outreg2 using "table4", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *M4- fem##pfem##coldeg mixed health i.fem##i.pfem##i.coldeg_pid i.coldeg i.race i.race_pid /// c.cage_p c.cage_p_pid i.cohab i.numkids || cid:, nocon res(exc) reml outreg2 using "table4", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *effect for MM is 1.coldeg_pid *effect for WM lincom 1.coldeg_pid+1.fem#1.coldeg_pid *effect for MW lincom 1.coldeg_pid+1.pfem#1.coldeg_pid *effect for WW lincom 1.coldeg_pid+1.fem#1.coldeg_pid+1.pfem#1. coldeg_pid+1.fem#1.pfem#1.coldeg_pid *WW vs MM lincom (1.coldeg_pid)-(1.coldeg_pid+1.fem#1.coldeg_pid+1.pfem#1. coldeg_pid+1.fem#1.pfem#1.coldeg_pid) *WW vs MW lincom (1.coldeg_pid+1.pfem#1.coldeg_pid)-(1.coldeg_pid+1.fem#1. coldeg_pid+1.pfem#1.coldeg_pid+1.fem#1.pfem#1.coldeg_pid) *WW vs WM lincom (1.coldeg_pid+1.fem#1.coldeg_pid+1.pfem#1.coldeg_pid+1. fem#1.pfem#1.coldeg_pid)-(1.coldeg_pid+1.fem#1.coldeg_pid) *MW vs WM lincom (1.coldeg_pid+1.pfem#1.coldeg_pid)-(1.coldeg_pid+1. fem#1.coldeg_pid) ***************************************************************** *Table 5 *M1- no interactions: mixed health i.fem i.pfem i.cohab /// i.coldeg i.coldeg_pid i.race i.race_pid c.cage_p c.cage_p_pid i. numkids /// || cid:, nocon res(exc) reml outreg2 using "table5", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) replace *M2- i.fem##i.cohab mixed health i.fem i.pfem i.cohab i.fem#i.cohab /// i.coldeg i.coldeg_pid i.race i.race_pid c.cage_p c.cage_p_pid i. numkids /// || cid:, nocon res(exc) reml outreg2 using "table5", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *M3- i.pfem##i.cohab mixed health i.fem i.pfem i.cohab i.pfem#i.cohab /// i.coldeg i.coldeg_pid i.race i.race_pid c.cage_p c.cage_p_pid i. numkids /// || cid:, nocon res(exc) reml outreg2 using "table5", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *M4- i.fem##i.pfem##i.cohab mixed health i.fem##i.pfem##i.cohab /// i.coldeg i.coldeg_pid i.race i.race_pid c.cage_p c.cage_p_pid i.numkids /// || cid:, nocon res(exc) reml outreg2 using "table5", excel symbol(***, **, *, +) alpha(0.001, 0.01, 0.05, 0.10) dec(2) append *effect for MM is 1.cohab *effect for WM lincom 1.cohab+1.fem#1.cohab *effect for MW lincom 1.cohab+1.pfem#1.cohab *effect for WW lincom 1.cohab+1.fem#1.cohab+1.pfem#1.cohab+1.fem#1.pfem#1.cohab *WW vs MM lincom (1.cohab)-(1.cohab+1.fem#1.cohab+1.pfem#1.cohab+ 1.fem#1.pfem#1.cohab) *WW vs MW lincom (1.cohab+1.pfem#1.cohab)-(1.cohab+1.fem#1.cohab+1.pfem#1. cohab+1.fem#1.pfem#1.cohab) *WW vs WM lincom (1.cohab+1.fem#1.cohab+1.pfem#1.cohab+1.fem#1.pfem#1. cohab)-(1.cohab+1.fem#1.cohab) *MW vs WM lincom (1.cohab+1.pfem#1.cohab)-(1.cohab+1.fem#1.cohab)

1.2 R Syntax

# TABLE 3 # M1.a <- lmer(health ~ 1 + (1 | cid), REML=TRUE, dat) summary(M1.a) # takes a while on this M1.b <- gls(health ~ 1, correlation = corCompSymm(form = ~1 | cid), dat) summary(M1.b) # faster M1.c <- geeglm(health ~ 1, id=cid, corstr="exchangeable", family='gaussian', data=dat ) summary(M1.c) M1 <- gls(health ~ fem + pfem, correlation = corCompSymm(form = ~1 | cid), dat) summary(M1) M2 <- gls(health ~ fem*pfem, correlation = corCompSymm(form = ~1 | cid), dat) summary(M2) M3 <- gls(health ~ fem*pfem + cohab + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M3) M4 <- gls(health ~ fem*pfem + cohab + numkids + race + cage_p, correlation = corCompSymm(form = ~1 | cid), dat) summary(M4) M5 <- gls(health ~ fem*pfem + cohab + numkids + race + cage_p + coldeg_pid + race_pid + cage_p_pid, correlation = corCompSymm(form = ~1 | cid), dat) summary(M5) # # TABLE 4 # #M3.1- no interactions: M3.1 <- gls(health ~ fem + pfem + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + cohab + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M3.1) #M3.2- femXcoldeg M3.2<- gls(health ~ fem + pfem + coldeg + coldeg_pid + fem*coldeg_pid + ace + race_pid + cage_p + rcage_p_pid + cohab + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M3.2) #M3- pfemXcoldeg M3.3<- gls(health ~ fem + pfem + coldeg + coldeg_pid + pfem*coldeg_pid + race + race_pid + cage_p + age_p_pid + cohab + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M3.3) #M4- femXpfemXcoldeg M3.4<- gls(health ~ pfem + coldeg + coldeg_pid + fem*pfem*coldeg_pid + race + race_pid + cage_p + cage_p_pid + cohab + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M3.4) # # TABLE 5 # #M1- All Controls- no interactions: M4.1 <- gls(health ~ fem + pfem + cohab + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M4.1) #M2- femXcohab M4.2<- gls(health ~ fem + pfem + cohab + fem*cohab + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M4.2) #M3- pfemXi.cohab M4.3<- gls(health ~ fem + pfem + cohab + pfem*cohab + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M4.3) #M4- femXpfemXcohab M4.4<- gls(health ~ fem*pfem*cohab + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + numkids, correlation = corCompSymm(form = ~1 | cid), dat) summary(M4.4) # equiv M4.4a <- geeglm(health ~ fem*pfem*cohab + coldeg + coldeg_pid + race + race_pid + cage_p + cage_p_pid + numkids, id=cid, corstr="exchangeable", family='gaussian', data=dat ) summary(M4.5a)

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Kroeger, R.A., Powers, D.A. (2019). Examining Same-Sex Couples Using Dyadic Data Methods. In: Schoen, R. (eds) Analytical Family Demography. The Springer Series on Demographic Methods and Population Analysis, vol 47. Springer, Cham. https://doi.org/10.1007/978-3-319-93227-9_7

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