For those not in the know, anovaplot is
a userwritten command.
. search anovaplot
points to a writeup:
SJ44 gr0009 . . . . . . . . . . Speaking Stata: Graphing model diagnostics
(help anovaplot, indexplot, modeldiag, ofrtplot, ovfplot,
qfrplot, racplot, rdplot, regplot, rhetplot, rvfplot2,
rvlrplot, rvpplot2 if installed)
Q4/04 SJ 4(4):449475
plotting diagnostic information calculated from residuals
and fitted values from regression models with continuous
responses
Now on the question, I'm not clear what John wants
that anovaplot does not provide,
as the main purpose of anovaplot is precisely to
show means according to anova factors.
Thus
. sysuse auto, clear
. anova mpg rep78 foreign
Number of obs = 69 Rsquared = 0.2825
Root MSE = 5.16246 Adj Rsquared = 0.2256
Source  Partial SS df MS F Prob > F
+
Model  661.189524 5 132.237905 4.96 0.0007

rep78  179.189006 4 44.7972516 1.68 0.1655
foreign  111.773747 1 111.773747 4.19 0.0447

Residual  1679.01337 63 26.6510059
+
Total  2340.2029 68 34.4147485
. anovaplot
gives me two parallel segmented lines shows means fitted
as a function of the factors, plus point symbols for the
data.
(For some unknown reason, ANOVA people tend to plot just
means, and not the original data, but the author of anovaplot
evidently does not approve. Any regression person
showing just a straight line would get told pretty promptly
to add the data by any competent refereee or boss.)
Nick
n.j.cox@durham.ac.uk
John Novak
> I would like to add a plot of the treatment means collapsed
> across the by
> variable to an anovaplot. I have done this:
>
> #delimit ;
> quietly anova y a b a*b;
> anovaplot ,
> scatter(msymbol(i) xsize(3) ysize(3) name(by_b, replace))
> plot(mband y a) ;
> delimit cr
>
> It is almost what I want, but adds the median band instead of a mean
> band. Does anyone know how I can accomplish the same effect,
> but with
> means instead of medians?
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