I am trying to look at the differences in income between African-Americans and White Americans. I am using panel data, and have run a fixed effects regression, which is the following:
Code:
xtreg linc i.highest_degree#bw i.bw#c.lhrswrk i.occup#bw ib2.urban_rural#bw i.marriage#bw i.bw#c.lwkswk_job i.census_region#bw, fe baselevel
At the end of every interaction with a categorical variable, I have one value which is always omitted; that too always the very last category in the categorical variables. It doesn't happen for the continuous ones.
Code:
note: 1.educ#1.bw omitted because of collinearity note: 10.occup#1.bw omitted because of collinearity note: 2b.urban_rural#1.bw omitted because of collinearity note: 5.marriage#1.bw omitted because of collinearity note: 4.census_region#1.bw omitted because of collinearity
Code:
marriage#bw | Never married#White | 0 (base) Never married#Black | -.5309271 .0851924 -2.02 0.043 -.3394337 -.0054707 Married#White | .8552037 .0204159 7.87 0.000 .1206852 .2007177 Married#Black | .4691787 .0831313 0.69 0.489 -.1054266 .2204569 Separ, Divorc#White | .0947397 .0391489 4.68 0.000 .1065997 .2600673 Separ, Divorc#Black | 0 (omitted) | bw#c.lwkswk_job | White | .1013588 .004665 21.73 0.000 .0922152 .1105023 Black | .1059799 .0079389 13.35 0.000 .0904193 .1215405
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