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[ODP] An update on the narrowing of the black-white gap in the Wordsum

(2014-Oct-15, 18:55:13)Chuck Wrote: To be clearer: Either (a) explain why I'm wrong about this or (b) briefly acknowledge the issue in your paper.

Not sure what you mean. Earlier, you said "It's not clear which better represents the true cohort effect, which would best be indexed by looking at same age persons at widely different times." but if I control for age, that means the d*cohort interaction is expressed in terms of constant age. When you control for age, it is fixed for all other independent vars. So, when using age as control var, I'm looking "at same age persons at widely different times", no ?

Besides, I also wanted to say that I have fixed few words (whites, wordsum) that have not been capitalized. More importantly, I will redo all my regressions (OLS and tobit). I have just read a few moments ago one of my blog post (draft) I have written in Word, several months ago. It says that when we use age in regression (and even in correlation) we should always add the squared (age^2) and cubed (age^3) terms of the main effect age. This is because in many instances, age is not linearly correlated with many things. Of course, in my analysis, age is not the key thing, but controlling for age with at least squared and cubed terms is more effective than not controlling for these terms. Still, this is annoying, that I knew this problem with nonlinearity of age, but I have completely forgotten to do that. I look like a fool; this is pathetic.

I attach the picture of nonlinearity of age with wordsum, just to show you. The second graph depicts the curve for blacks and whites. There is a positive bw gap interaction with age because older blacks lose a lot of "IQ" points whereas old and middle-aged whites are stagnating.

The syntax was :

gen age2 = age^2
gen age3 = age^3
gen bw1age = bw1*age
gen bw1age2 = bw1*age2
gen bw1age3 = bw1*age3
tobit wordsum age age2 age3 [pweight = weight], ll ul
predict preda, xb
scatter preda age
tobit wordsum age age2 age3 bw1 bw1age bw1age2 bw1age3 [pweight = weight], ll ul
predict predb, xb
graph twoway (scatter predb age if bw1==0, msymbol(Oh)) (scatter predb age if bw1==1, msymbol(O)), legend(label(1 black) label(2 white))

I will update the whole thing when it's done. If someone has some other things they would like me to include, just say it.

Attached Files Thumbnail(s)

[ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Sep-30, 12:25:47
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Sep-30, 13:28:55
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Duxide - 2014-Sep-30, 14:53:55
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Sep-30, 20:32:05
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Sep-30, 21:29:53
Review - by Emil - 2014-Oct-03, 13:51:06
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-06, 01:39:02
Review 1.1 - by Emil - 2014-Oct-06, 02:23:09
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-06, 03:14:22
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-06, 20:57:19
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-08, 18:21:08
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Oct-06, 03:48:11
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-08, 23:17:18
Comments on MH #13 - by Emil - 2014-Oct-08, 23:41:37
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-10, 02:11:07
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-10, 03:02:02
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-10, 18:27:28
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-09, 00:24:16
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Oct-09, 01:42:11
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-09, 03:15:23
Reply to MH #17 - by Emil - 2014-Oct-09, 04:01:39
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-09, 17:33:25
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-11, 20:36:25
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-13, 22:51:02
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Dalliard - 2014-Oct-12, 15:27:29
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-12, 17:56:25
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Oct-12, 17:30:15
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-14, 02:22:25
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-14, 05:48:45
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-15, 18:55:13
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-15, 20:20:15
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Oct-16, 02:10:39
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Oct-15, 21:18:47
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-15, 21:34:38
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-19, 18:05:02
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Oct-25, 02:43:30
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Nov-27, 06:44:06
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Nov-27, 22:55:31
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Nov-27, 23:17:14
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Nov-28, 00:30:33
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Nov-29, 02:02:05
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-12, 03:26:32
Version 3 - by Emil - 2014-Dec-12, 07:11:08
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-13, 02:21:52
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Dec-13, 03:58:29
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-13, 20:18:01
Reply to MH #46 - by Emil - 2014-Dec-14, 01:01:38
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-14, 23:11:43
MH #48 - by Emil - 2014-Dec-15, 05:17:03
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-15, 23:33:48
MH #50 - by Emil - 2014-Dec-16, 05:40:59
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-17, 00:27:46
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-19, 02:30:11
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Dec-22, 23:35:37
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-22, 23:39:48
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Dec-22, 23:53:51
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Dec-23, 00:07:39
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2014-Dec-23, 05:31:46
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2014-Dec-23, 09:03:24
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2014-Dec-24, 00:48:43
Reply to MH #52, 53, 60 - by Emil - 2014-Dec-27, 05:54:46
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2015-Jan-05, 21:24:06
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Chuck - 2015-Jan-06, 01:14:02
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Meng Hu - 2015-Jan-31, 04:47:41
RE: [ODP] An update on the narrowing of the black-white gap in the Wordsum - by Emil - 2015-Jan-31, 06:18:48

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