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From |
Mandy fu <mandy.fu1@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: matching created matrix and the original data set |

Date |
Tue, 18 Aug 2009 13:09:47 -0400 |

Hi all, Regarding this question, I am thinking perhaps it is easier to not come back to the original data set. For instance , if using --xsvmat-- convert the created matrix into a new data set, which only includes women, I can do the t test there. I will appreciate if you could give me some suggestion. Thanks! Mandy On 8/18/09, Mandy fu <mandy.fu1@gmail.com> wrote: > Hi all, > > It would be great if you could give me some suggestion on the > following question about matrix operation for a survey data set. > > The data set includes respondents of male (2517 obs)and female(2480 > obs).First I run earnings function for male and female separately. > Then I want to do a t test for comparing the group mean of (sum of > Bmale*X'female) and (sum of Bfemale*X'female). The former means the > earnings of a female when she is treated the same as a male with > identical endowment in labor market. The latter means the predicted > value of how much a female earns., > > where Bmale: the coefficients get for a regression for each male > Bfemale: the coefficients get for a regression for each female > Xmale: the original values of independent variables for each male > Xfemale: the original values of independent variables for each female > > From matrix calculation, I have get two matrices( each has 2480 rows > and 1 column ) that each row presents each female in the data set. But > in order to do the t-test , I need to take the probability weight into > consideration. > > I am thinking maybe I could use one of the following way to do this: > (1) During matrix calculation, I include the probability weight as an > additional column. So, I can do the t-test without coming back to the > original data set. > (2)After matrix calculation, I convert the results into variables for > each female and add the new variables to the original data set. Then > do the t test in the original data set. > > As to (2), I am not sure using --svmat--how to make sure the new > variables converted from matrices match the ID numbers in the original > data set(each matrix is only for female, but the data set includes > male and female). Could I expand the matrix by adding zero rows for > male before converting variables? And I am not sure which one of the > two ways is easier. > > If there is anything I need to clarify, please let me know. Thanks for > your help! > > 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/

**References**:**st: matching created matrix and the original data set***From:*Mandy fu <mandy.fu1@gmail.com>

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