HISTOGRAM Statement: CAPABILITY Procedure

Overview: HISTOGRAM Statement

Histograms are typically used in process capability analysis to compare the distribution of measurements from an in-control process with its specification limits. In addition to creating histograms, you can use the HISTOGRAM statement to do the following:

  • specify the midpoints or endpoints for histogram intervals

  • display specification limits on histograms

  • display density curves for fitted theoretical distributions on histograms

  • request goodness-of-fit tests for fitted distributions

  • display kernel density estimates on histograms

  • inset summary statistics and process capability indices on histograms

  • save histogram intervals and parameters of fitted distributions in output data sets

  • create hanging histograms

  • request graphical enhancements

  • create comparative histograms by using the HISTOGRAM statement together with a CLASS statement

You have three alternatives for producing histograms with the HISTOGRAM statement:

  • ODS Graphics output is produced if ODS Graphics is enabled, for example by specifying the ODS GRAPHICS ON statement prior to the PROC statement.

  • Otherwise, traditional graphics are produced by default if SAS/GRAPH® is licensed.

  • Legacy line printer charts are produced when you specify the LINEPRINTER option in the PROC statement.

See Chapter 3: SAS/QC Graphics, for more information about producing these different kinds of graphs.