R help - May 2006 - qqmath - Lattice error

Hi,

Don't have a clue what teh following error message


generated by this function call:
qqmath( ~val|ind,data = xx
       ,distribution = function(p){ qt(p,df=20)}
       ,ylab="Sample Quatinles"
       ,xlab="Theoretical Quantiles"

       ,panel=function(x,y)
       {
         panel.qqmathline(y
                          , distribution=function(p) qt(p,df=20)
                          ,col=2)
         panel.qqmath(x, y
                      , distribution=function(p) qt(p,df=20)
                      ,pch=".",cex=2)
       }
)

means. Espacially that this function call

qqmath( ~val|ind,data = xx
       ,distribution = function(p){ qt(p,df=20)}
       ,ylab="Sample Quatinles"
       ,xlab="Theoretical Quantiles"
)

with the same data is working.

Thanks in advance for suggestions.

Eryk

	[[alternative HTML version deleted]]

Witold Wolski wrote:
> Hi,
> 
> Don't have a clue what teh following error message
> 
> 
> generated by this function call:
> qqmath( ~val|ind,data = xx
>        ,distribution = function(p){ qt(p,df=20)}
>        ,ylab="Sample Quatinles"
>        ,xlab="Theoretical Quantiles"
> 
>        ,panel=function(x,y)
>        {
>          panel.qqmathline(y
>                           , distribution=function(p) qt(p,df=20)
>                           ,col=2)
>          panel.qqmath(x, y
>                       , distribution=function(p) qt(p,df=20)
>                       ,pch=".",cex=2)
>        }
> )
> 
> means. Espacially that this function call
> 
> qqmath( ~val|ind,data = xx
>        ,distribution = function(p){ qt(p,df=20)}
>        ,ylab="Sample Quatinles"
>        ,xlab="Theoretical Quantiles"
> )
> 
> with the same data is working.
> 
> Thanks in advance for suggestions.
> 
> Eryk
> 
Hi, Eryk,

The function panel.qqmath does not take an argument "y".

Here's a complete example (which you should have supplied):

library(lattice)
set.seed(1)
xx <- data.frame(ind = factor(rep(1:4, each = 100)))
xx$val <- rt(400, 20)
qt2 <- function(p) qt(p, df = 20)
qqmath(~val | ind, data = xx,
        distribution = qt2,
        ylab = "Sample Quantiles",
        xlab = "Theoretical Quantiles",
        panel = function(x) {
          panel.qqmathline(x, distribution = qt2, col = 2)
          panel.qqmath(x, distribution = qt2, pch=".", cex = 2)
        })

--sundar

P.S. Please (re-)read the posting guide. If you get an error in your 
script, tell us what it is. And provide an complete example (the posting 
guide gives guidelines here). Quite often I solve my own problem in the 
process of coming up with an example I'd like to post to R-help.

On 5/25/06, Witold Wolski <wewolski at gmail.com>
wrote:
> Hi,
>
> Don't have a clue what teh following error message
What's the error message?

In any case, you seem to have wrong expectations about what
panel.qqmath does, and in particular what arguments it accepts (this
changed a few versions back). See help(panel.qqmath).

Deepayan
> generated by this function call:
> qqmath( ~val|ind,data = xx
>        ,distribution = function(p){ qt(p,df=20)}
>        ,ylab="Sample Quatinles"
>        ,xlab="Theoretical Quantiles"
>
>        ,panel=function(x,y)
>        {
>          panel.qqmathline(y
>                           , distribution=function(p) qt(p,df=20)
>                           ,col=2)
>          panel.qqmath(x, y
>                       , distribution=function(p) qt(p,df=20)
>                       ,pch=".",cex=2)
>        }
> )
>
> means. Espacially that this function call
>
> qqmath( ~val|ind,data = xx
>        ,distribution = function(p){ qt(p,df=20)}
>        ,ylab="Sample Quatinles"
>        ,xlab="Theoretical Quantiles"
> )
>
> with the same data is working.