Time scale for NP Chart

Stat > Control Charts > Attributes Charts > NP > Scale > Time

Specify a time scale for the x-axis.

Index
Label the x-axis with the number of the subgroup.
Stamp
Label the x-axis with values from a column. In Stamp columns (1-3, innermost first), enter up to three columns that contain date/time, numeric, or text values for the scale.
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