MINSAMPLE Subcommand (SPCHART command)

MINSAMPLE specifies the minimum sample size for X-bar, R, or s charts, as well as process capability charts when the data are organized in subgroups. When you specify XR, XS, or CPCHART on SPCHART, any subgroup with a size that is smaller than the size that is specified on MINSAMPLE is excluded from the chart and from all computations. If each case is a subgroup, there must be at least as many variables named as the number that is specified on MINSAMPLE. The default, as well as the minimum, is 2.