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# [OBG] Sexual selection explains sex and country differences in fluid g

When someone performs multiple regression, especially in case where there is few indep var, I always recommend to test for the presence of interaction (i.e., non linear relationship.

When you try the following :

COMPUTE sex_gdp_interaction=Difference*GDP.
EXECUTE.

REGRESSION
/DESCRIPTIVES MEAN STDDEV CORR SIG N
/MISSING LISTWISE
/STATISTICS COEFF OUTS CI(95) R ANOVA COLLIN TOL CHANGE ZPP
/CRITERIA=PIN(.05) POUT(.10)
/NOORIGIN
/DEPENDENT PISA_Score_Total
/METHOD=ENTER Difference GDP sex_gdp_interaction
/PARTIALPLOT ALL
/SCATTERPLOT=(*ZRESID ,*ZPRED)
/RESIDUALS DURBIN HISTOGRAM(ZRESID) NORMPROB(ZRESID).

The regress coeff for sex, gdp, and interaction are 0.170, 0.426, 0.185. It's clearly different from what you initially have (0.323, and 520). The gender effect has been divided by an half.

When you repeat the same procedure with pisa SD in dependent var., instead of having -0.490 and -0.147 for sex and gdp, you have -0.302, -0.030, -0.226 for sex, gdp, and their interaction, respectively. This means there is virtually no main effect of GDP, and its (direct) effect is only a matter of interaction, (i.e., the effect of GDP, while probably null at low value of sex difference, it increases as the sex difference increases).

Practioners should also and always check for normal distribution of the residuals. Hopefully, they look normal.

MR, in any case, is a sub-optimal way to "control" for covariates (or for what it means). If you need to look at the effect of GDP net of that of gender, you should better use male/female PISA as dependent var, separately, but if that means you have only 1 indep var, MR and bivariate correlation are not distinguishable methods (they produce the same results). For what I have seen, using SD or score for male/female separately makes no difference for the correlation with GDP.

[OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-04, 18:47:17
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-04, 21:25:33
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-04, 21:54:51
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-04, 22:58:00
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-04, 23:00:24
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-05, 07:19:04
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-05, 09:00:05
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-06, 01:02:26
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-06, 18:37:08
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-06, 23:18:01
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-06, 23:18:34
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Barleymow - 2014-Jul-06, 19:55:55
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-06, 20:16:38
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Emil - 2014-Jul-09, 16:51:13
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Philbrick Bastinado - 2014-Jul-09, 22:35:01
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Peter Frost - 2014-Jul-06, 22:14:07
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-06, 22:40:41
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Peter Frost - 2014-Jul-07, 02:29:21
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-07, 09:35:16
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-08, 18:22:28
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-08, 19:16:51
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-08, 21:10:46
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Meng Hu - 2014-Jul-09, 17:40:15
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-09, 22:00:15
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Meng Hu - 2014-Jul-10, 16:22:54
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-10, 16:47:23
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Emil - 2014-Jul-13, 02:38:15
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Emil - 2014-Jul-23, 00:53:40
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-23, 09:25:43
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-23, 19:27:46
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-23, 23:47:33
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Meng Hu - 2014-Jul-25, 22:37:50
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-25, 22:39:52
RE: [OBG] Sexual selection explains sex and country differences in IQ - by nooffensebut - 2014-Jul-26, 03:54:00
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-26, 11:28:37
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Chuck - 2014-Jul-27, 00:59:27
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-28, 12:31:54
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Jul-29, 23:10:37
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-29, 23:38:12
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Jul-30, 04:33:03
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-30, 08:53:08
RE: [OBG] Sexual selection explains sex and country differences in IQ - by nooffensebut - 2014-Jul-27, 09:16:43
RE: [OBG] Sexual selection explains sex and country differences in IQ - by Duxide - 2014-Jul-27, 10:00:11
RE: [OBG] Sexual selection explains sex and country differences in IQ - by nooffensebut - 2014-Jul-28, 00:00:56
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-29, 17:27:19
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-28, 15:15:27
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-29, 23:45:07
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Meng Hu - 2014-Jul-30, 19:49:41
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-30, 19:56:24
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Jul-31, 04:05:21
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Meng Hu - 2014-Jul-30, 21:33:41
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-30, 22:57:05
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Jul-31, 02:58:26
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-31, 10:07:32
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Jul-31, 21:48:04
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-01, 00:21:32
More CPS data - by Emil - 2014-Jul-30, 21:47:39
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-30, 22:36:17
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Jul-30, 23:40:22
gf and gc - by Emil - 2014-Jul-31, 11:03:20
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Kenya Kura - 2014-Aug-01, 09:44:26
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Emil - 2014-Aug-01, 13:08:33
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Kenya Kura - 2014-Aug-02, 09:08:38
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Meng Hu - 2014-Aug-01, 14:21:48
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-01, 16:02:02
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Emil - 2014-Aug-01, 16:14:45
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-01, 16:51:11
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Aug-02, 04:20:51
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-02, 19:55:43
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Aug-03, 18:29:11
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-01, 19:50:34
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Emil - 2014-Aug-02, 14:06:49
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-02, 19:44:48
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-03, 19:22:37
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Aug-03, 19:27:56
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-03, 19:33:19
Piffer spacing strikes back - by Emil - 2014-Aug-03, 19:56:43
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-03, 20:07:41
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-07, 10:06:41
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Chuck - 2014-Aug-07, 18:13:35
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by nooffensebut - 2014-Aug-08, 00:52:59
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-08, 09:39:14
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by nooffensebut - 2014-Aug-08, 11:40:04
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-08, 12:12:24
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by nooffensebut - 2014-Aug-08, 13:12:10
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-08, 23:23:31
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Meng Hu - 2014-Aug-12, 02:27:25
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by Duxide - 2014-Aug-12, 15:11:26
RE: [OBG] Sexual selection explains sex and country differences in fluid g - by General-Factor analyst - 2016-Feb-11, 02:26:16

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