Use NP Chart to monitor the number of defective items where each item can be classified into one of two categories, such as pass or fail. Use this control chart to monitor process stability over …

Choose Stat > Control Charts > Attributes Charts > NP. In Variables, enter Defectives. In Subgroup sizes, enter 500. Click NP Chart Options. On the Tests tab, select 1 point > K …

You can use either the P chart or the NP chart to plot your defective units. The main difference between P and NP charts is the vertical scale. P charts show the proportion of defective units …

parameter for Test 1. The default is 3. (For more information go to Select tests for special causes for NP Chart.)

Complete the following steps to interpret an NP chart. Key output includes the NP chart and the test results.

If you can determine only whether an item is defective or nondefective, use this chart. If you can count the number of defects on each item, use U Chart , Laney U' Chart , or C Chart to plot …

Find definitions and interpretation guidance for every statistic and graph that is provided with the NP chart.

Complete the following steps to specify the data to analyze for your control chart. In Variables , enter the column that contains the process data. Each row contains the number of defectives …

Stat > Control Charts > Attributes Charts > NP > Data Options. All rows /No rows Include or exclude all rows. Rows that match Include or exclude rows that match specified conditions.

Stat > Control Charts > Attributes Charts > NP > NP Chart Options > Estimate If some subgroups have erratic data because of special causes that you have already corrected, you can omit …