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From |
"Ben Jann" <ben.jann@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st:better way to calculate XfBm after -oaxaca- for mael and female |

Date |
Tue, 4 Nov 2008 22:42:09 +0100 |

I am not sure whether I correctly understand the question, but I think XfBf and XfBm (where X stands for the vector of means, B for the coefficients vector, and f/m for female/male) can be easily computed, e.g. as follows: . use http://fmwww.bc.edu/RePEc/bocode/o/oaxaca.dta . oaxaca lnwage educ exper tenure, by(female) . display [Differential]_b[Prediction_2] . display [Differential]_b[Prediction_2] + [Decomposition]_b[Coefficients] or . matrix b = e(b) . display b[1,2] . display b[1,2] + b[1,5] (i.e. XfBf is the mean prediction for group 2, XfBm is the mean prediction plus the Coefficients component.) Depending on the type of decomposition and if -detail- is specified you have to adjust the labels/column numbers in the example. ben On Tue, Nov 4, 2008 at 10:08 PM, Mandy fu <mandy.fu1@gmail.com> wrote: > Hi all, > After -oaxaca- for wages of male and female, I want to calculate XfBf > (predicted wage of female)and XfBm(How much would a female earn if she > was treated exactly the same as a male in labor market). Where , Xf > means the factors affecting wages of female; Bm means the coeffcients > of factors affecting male wage. > I use the following way to do the calculation. But I need to figure > out what numbers should be selected fromt he matrix to get XfBm . So > it takes quite a while to do all teh work when there are lots of > oaxaca decompositions to do. > So , I was wondering if anyone could give me some idea if there's any > easier way to do this. Sorry for bring up the details. It'll be > helpful if you give some hints of where I could revise. > Thanks for yur help! > --------------------------------after oaxaca compute XfBf, XfBm. ( m: > male ; f:female) > .oaxaca lnwage x1-x17, by (female) weight(1) > .matrix b=e(b) > .matrix b0=e(b0) > .matrix list b > .matrix list b0 > *b is a matrix [1,40] > *b [1 predict_male, 1 predict_female, 1 difference,17 explained, > total_explained, 17 unexplained,1constant, 1 total_unexplained] > *b0 is a matrix 1*72. > *b0 [17 coefficents_male, 1 constant,17 coeffcients_female,1 constant, > 17 X values_male ,1 constant,17 X values_female,1 constant] > *select the second number in b as XfBf: > .matrix XfBf=b [1,. . ., 1 . . 2] > *select the number 1-18 in b0 as Bm. > .matrix Bm=b0[1 . . . , 1 . . 18] > *select the number 55-72 in b0 as Xf. > .matrix Xf=b0[1 . . . , 55 . . 72] > *calculate Xf*Bm. > .matrix XfBm=Xf*Bm' > .svmat XfBm > display XfBm > -------------------------------------------------------------------------- > Thanks! > Mandy > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st:better way to calculate XfBm after -oaxaca- for mael and female***From:*"Mandy fu" <mandy.fu1@gmail.com>

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