Dear Bart,
According to your suggestion I wrote to maintainer of the package and the
reply which I got is as follows:-
"You shouldn't use R charts for
monitoring dispersion using sample sizes larger than 20, and for
sample sizes greater than 25 you get an error. From theory, R chart
used t
It looks like there is an NA created, and then used to calculate stdev.
But it's inside function, and these seems all wrapped functions, where one
function calls another, which calls another, which calls .
I suggest you contact the maintainer of the package, send him the data and
your error.
T
I don't really know qcc, but it seems to me that you might
have to provide information about within-group variability.
But maybe I'm completely out to lunch on this.
-Peter Ehlers
vikrant wrote:
Thanks Bart and Peter for your help and the example is working for c chart as
well withut any error
Thanks Bart and Peter for your help and the example is working for c chart as
well withut any error. But when I am plotting the R chart i am still getting
the following error.
Error in limits.R(center = 62614.0571428571, std.dev = NA_real_, sizes =
c(1000L, :
group size must be less than 51 when
I'm sorry, I'm doing this in my spare time, hadn't time during the day.
But I tried your example, and didn't get the error.
If you get the error with your example (with the data you had sent to this
list),
then I think Peter is right, and it has something to do with margins you had
set.
Try to st
I'm sorry, I'm doing this in my spare time, hadn't time during the day.
But I tried your example, and didn't get the error.
If you get the error with your example (with the data you had sent to this
list),
then I think Peter is right, and it has something to do with margins you had
set.
Try to st
I suspect that you may have set qcc.options("cex") to
too large a value. Try lowering it with
qcc.options(cex=whatever)
-Peter Ehlers
vikrant wrote:
ok. I will give the example for which i m getting this error. The data for
plotting R chart and S chart is very huge. SO i will take example for
ok. I will give the example for which i m getting this error. The data for
plotting R chart and S chart is very huge. SO i will take example for
plotting C chart.
Data is a follows :-
sample D sizetrial
1 11 1000TRUE
2 11 1000TRUE
3 13 1000T
Please add an reproducible example, so that we can see where it goes wrong.
Maybe the error is raised by faulted data?
Bart
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