Hi there,
I have a series of data (monthly), I didn't find the seasonal fluctuation but a few sporadic data that affects the overall mean and demonstrates a significant increase. .....
When I removed those data (5/42 in different times), the mean for both periods are the same..I'm thinking to remove those data and don't slit the chart (P chart), but I don't know if I remove them, will that still be counted as a process control (leave gaps in months....)
Thank you
Angie