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From |
lreine ycenna <lreine.ycenna@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Re: plotting marginal effect for xtreg interaction terms |

Date |
Wed, 19 Oct 2011 13:02:59 +0100 |

I'm guessing that it has something to do with the small data size - only 6 years. On 19 October 2011 12:54, lreine ycenna <lreine.ycenna@gmail.com> wrote: > hello, > I seem to have made an error somewhere in my command, but I don't know where. > (1) stata returns an error message after the first line of my command > is entered (xtreg Y A B AxB, fe)- independent variables are collinear > with the panel variable cn r(198); > > (2) I'm not sure whether I can plot the marginal effect for xtreg. > Correct me if im wrong. > > > > My equation is -xtreg Y A B AXB, fe -. > I'm interested to know how B will change with respect to an increase in A. > > Here's my command: > > xtreg Y A B AxB, fe > > generate income=((_n-1)/10) > > matrix b=e(b) > matrix V=e(V) > scalar b1=b[1,1] > scalar b2=b[1,2] > scalar b3=b[1,3] > scalar varb1=V[1,1] > scalar varb2=V[2,2] > scalar varb3=V[3,3] > scalar covb1b3=V[1,3] > scalar covb2b3=V[2,3] > > scalar list b1 b2 b3 varb1 varb2 varb3 covb1b3 covb2b3 > > gen lab=b1+b3*income > gen conse=sqrt(varb1+varb3*(income^2)+2*covb1b3*income) > gen a=1.96*conse > gen upper=conb+a > gen lower=conb-a > graph twoway (line lab income, clwidth(medium) clcolor(blue) clcolor(black)) > > Thanks. > * * 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: plotting marginal effect for xtreg interaction terms***From:*lreine ycenna <lreine.ycenna@gmail.com>

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