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?

Thanks & Best Regards,
Steven





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