[R] qcc package

[Uwe Ligges]

On 08.02.2013 23:37, Steven LeBlanc wrote:
> Greets,
>
> My data looks like:
>
>> p3.18
>        s xbar subgroup
> 1  0.84 12.2        1
> 2  1.64 11.2        2
> 3  2.07 10.6        3
> 4  2.49 12.2        4
> 5  0.84 11.2        5
> ...
>
> Using the command
>
>> qcc(p3.18$xbar,type="xbar",sizes=5,center=mean(p3.18$xbar),std.dev=mean(p3.18$s)/0.94,title="X-bar Chart for Paper Sheet Length Data")
>
> I get the x-bar chart I expect.
>
> However, using the command
>
>> qcc(p3.18$s,type="S",sizes=5,center=mean(p3.18$s),std.dev=mean(p3.18$s)/0.94,title="S Chart for Paper Sheet Length Data")
>
> I get the following error:
>
> Error in plot.window(...) : need finite 'ylim' values
 >
> It seems reasonable that if the first command produces correct results, so should the second. What am I doing wrong?

Watch out for NA, NaN, Inf or -Inf values in p3.18$s ?

Uwe Ligges



> Thanks & Best Regards,
> Steven
>
>
>
>
>
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