Mr. Nilsson,
Thanks very much for your help!
>From Henric Nilsson <[EMAIL PROTECTED]>:
> At 19:52 2003-10-04 +0800, you wrote:
>
> >How can I use panel.qqmathline, in package lattice, to add
> >straight lines onto the plots generated by qqmath?
> >[...]
> > > data(sleep)
> > > qqnorm(~ extra | group, data=sleep, aspect=1)
>
> Try
>
> qqmath(~ extra | group, data = sleep, aspect = 1,
> distribution = qnorm, prepanel = prepanel.qqmathline,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is the part that I did not figure out!
Actually, I thought I can leave "distribution = qnorm" out
since it is default.
> panel = function(x, y, ...) {
> panel.qqmathline(y, distribution = qnorm, ...)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Again, I thought "distribution = qnorm" can be left out since
it is specified before.
Since it causes error without "distribution = qnorm",
I was confused by the lines in help(panel.qqmathline):
distribution: quantile function for reference theoretical distribution.
This is automatically passed in when this is used as a panel
function in `qqmath'.
I don't understand how the "automatically passed in" can work.
> panel.qqmath(x, y, ...)
> })
>
> Hope this helps,
> Henric
>
> ------------------------------------------------------------------------------
---------
> Henric Nilsson, Statistician
>
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Best regards,
Joseph Lu
Department of Statistics
National Cheng-Kung University
Tainan, Taiwan
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