S
Sitiz
Hi experts,
I have a Q regards to IMR chart. I went around to look in the net and found there are 2 versions of it.
1) IMR only can have individual data which means we will tk the constant which carries n=2 only everytime.
2) IMR can have subgroups. thats the reason we have a constant table for individual with sample size till 10 (the table of constant we I got it from (ASTM publication STP-15D, Manual on the Presentation of Data and Control Chart Analysis, 1976; pp134-136.)
My Q, which is the right one?If the version 2 is right,I wonder how the way to calculate the UCL & LCL and how this will differ with the Xbar R chart or X bar S chart (which we knows carries the subgroup ).Thanks a lot for your explanation.
I have a Q regards to IMR chart. I went around to look in the net and found there are 2 versions of it.
1) IMR only can have individual data which means we will tk the constant which carries n=2 only everytime.
2) IMR can have subgroups. thats the reason we have a constant table for individual with sample size till 10 (the table of constant we I got it from (ASTM publication STP-15D, Manual on the Presentation of Data and Control Chart Analysis, 1976; pp134-136.)
My Q, which is the right one?If the version 2 is right,I wonder how the way to calculate the UCL & LCL and how this will differ with the Xbar R chart or X bar S chart (which we knows carries the subgroup ).Thanks a lot for your explanation.