I am running version 9.2.
1) I need to run a regression (tw vs. tl) with a categorical covariate (trt). Is the code below the correct way to do this?
anova tw tl trt, continuous(tl) regress
2) If this is the correct way, I get the output below. Is there a way to take this output and graph the 8 lines (one for each of the covariate levels)?
Source | SS df MS Number of obs = 232
-------------+------------------------------ F( 8, 223) = 431.03
Model | 291.624203 8 36.4530254 Prob > F = 0.0000
Residual | 18.8594709 223 .084571618 R-squared = 0.9393
-------------+------------------------------ Adj R-squared = 0.9371
Total | 310.483674 231 1.34408517 Root MSE = .29081
------------------------------------------------------------------------------
tw Coef. Std. Err. t P>|t| [95% Conf. Interval]
------------------------------------------------------------------------------
_cons -6.723445 .1812834 -37.09 0.000 -7.080693 -6.366197
tl .1490997 .0026019 57.30 0.000 .1439723 .1542272
trt
1 .1823635 .0891331 2.05 0.042 .0067125 .3580146
2 .0892382 .0956802 0.93 0.352 -.0993149 .2777912
3 -.0792475 .0965642 -0.82 0.413 -.2695426 .1110475
4 .0509725 .0952589 0.54 0.593 -.1367502 .2386953
5 .0516925 .1101982 0.47 0.639 -.1654705 .2688556
6 -.0398991 .0953103 -0.42 0.676 -.2277233 .147925
7 -.0433976 .1102038 -0.39 0.694 -.2605718 .1737765
8 (dropped)
____________________________________________________________________________________
You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost.
http://tc.deals.yahoo.com/tc/blockbuster/text5.com
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
