problems with SPC charts in R
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
plotting C chart.
Data is a follows :-
sample D size trial
1 11 1000 TRUE
2 11 1000 TRUE
3 13 1000 TRUE
4 11 1000 TRUE
5 14 1000 TRUE
6 12 1000 TRUE
7 17 1000 TRUE
8 7 1000 TRUE
9 7 1000 TRUE
10 6 1000 TRUE
11 9 1000 TRUE
12 3 1000 TRUE
13 2 1000 TRUE
14 4 1000 TRUE
15 13 1000 TRUE
16 11 1000 TRUE
17 7 1000 TRUE
18 11 1000 TRUE
19 8 1000 TRUE
20 5 1000 TRUE
21 37 1000 TRUE
22 11 1000 TRUE
23 9 1000 TRUE
24 4 1000 TRUE
25 7 1000 TRUE
26 4 1000 TRUE
27 17 1000 TRUE
28 11 1000 TRUE
29 18 1000 TRUE
30 21 1000 TRUE
31 18 1000 TRUE
32 19 1000 TRUE
33 12 1000 TRUE
34 11 1000 TRUE
35 13 1000 TRUE
Here my sample size is 1000 for each sample no.
1st column corresponds to sample no.
2nd column corresponds to no. of defects
3rd column corresponds to sample size
4th column , I have kept asTRUE because I want to consider whole data for
calculating the control limits.
The code which i use is as follows :-
library(qcc)
y<-read.table("Defect_data_2008.csv",sep=",",header=TRUE)
attach(y)
obj<-qcc(D[trial],sizes=size[trial],type="c")
But while plotting C chart I am getitng following error
Error in plot.new() : figure margins too large
For plotting the pchart if I just change the type="p" then it is plotting
correctly without error.
Peter Ehlers University of Calgary