Allows you to adjust histogram bin intervals and the approximate number of bars.Step 3: Click theInsert tab, click statistics charts (a blue icon with three vertical bars) and then click a histogram icon. To do this, click and hold on the first cell and then drag the mouse down to the end of the data. Step 2: Highlight the data you entered in Step 1. Allows you to experiment with how spec limits impact Cp Cpk by changing them in the histogram calculations worksheet. Step 1: Enter your data into a single column.Calculations can be viewed and updated in the Excel worksheet created by QI Macros.
What is Cool about QI Macros Histogram Maker in Excel? These are numeric values that tell you how well your process is meeting customer requirements. The best histogram maker's will also calculate process capability metrics Cp, Cpk and Pp Ppk. Data points outside of the spec limits represent products or processes that don't meet customer requirements. There can be both an upper spec limit (USL) and a lower spec limit (LSL) or just one of the two. Does your data fit or not? Is it centered?Ĭustomer Requirements are the Specification Limits (Goal Posts)Įxperts refer to these goal posts as specification limits. They are most valuable when they display your customer's requirements as goal posts. Histograms show the spread, or dispersion, of variable data.
