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

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Wed, 19 Oct 2011 12:54:49 +0100 |

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/

**Follow-Ups**:**Re: st: plotting marginal effect for xtreg interaction terms***From:*Maarten Buis <maartenlbuis@gmail.com>

**st: Re: plotting marginal effect for xtreg interaction terms***From:*lreine ycenna <lreine.ycenna@gmail.com>

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