Methodology for sampling
in which units are selected from the population at a regular interval (e.g.,
once an hour, every other lot, etc.). This is used for many SPC,
(statistical process control), control
charts like X Bar and R
One reason for this type of sampling is to
see if the process has any variations
due to different times of the day, shift workers changing, temperature
changes during day vs night times, etc.
For additional detailed information on SPC,
(statistical process control), see our statistical
process control overview and X
bar and R bar control charts.
Also see Random