[R] overlaying qqnorm plots...

[Peter Dalgaard BSA]

"Jeff D. Hamann" <jeff_hamann at hamanndonald.com> writes:

> The resulting plot contains the two qqnorm plots, and the x axis stays the
> same. The y axis ("Sample Quantiles") scales for the different plots. I
> would to fix the y axis (fix the quantiles values?) and plot the different
> plots in different colors. Is that possible?

Something along these lines:

q1 <- qqnorm( residuals( lm( q ~ p + f + a ) ), plot.it=F )
q2 <- qqnorm( residuals( tsls( q ~ p + d, ~ d + f + a ) ), plot.it=F  )

yl <- range(q1$y,q2$y)
qqnorm( residuals( lm( q ~ p + f + a ) ), ylim=yl)
points(q2, col="red")

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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