If the Curve chart option is chosen as shown in the dialog box in Figure 3 then the output is as in Figure 6.įigure 6 – Smoothed Line Curve The optimum number of bins Note that if 100 is inserted in the Maximum bin value (or blank) field of Figure 3 then the output would be as shown in Figure 5.įigure 5 – Frequency Table and Histogram (revised) Curve Option Fill in the dialog box that appears as shown in Figure 3.įigure 3 – Dialog box for Histogram data analysis toolĪfter clicking on the OK button, the output as shown in Figure 4 is displayed. Real Statistics Data Analysis Tool: The Histogram with Normal Curve Overlay data analysis tool provided in the Real Statistics Resource Pack can be used to create a frequency table and histogram as illustrated in the following example.Įxample 2: Create a frequency table and histogram for the 22 data elements in the range A4:B14 of Figure 1 based on bins of size 15.Įnter Ctrl-m and select the Histogram with Normal Curve Overlay option. Alternatively, the Real Statistics Histogram with Normal Curve Overlay data analysis tool can be used.
This is the approach illustrated in Example 4 of Frequency Tables using the FREQTABLE supplemental function.
To avoid this problem equally-spaced intervals can be used. Otherwise, a distorted picture of the data may be presented. For most purposes, it is important that the intervals be equal in size (except for an unbounded first and/or last interval). Figure 2 – Histogram data analysis tool CautionĬaution must be exercised when creating histograms to present the data in a clear and accurate way. You can optionally include the labels for these ranges (in which case you check the Labels check box).įor Example 1, the Input Range is A4:B14 and the Bin Range is D4:D7 (with the Labels check box unchecked).
In the dialog box that is displayed you next specify the input data (Input Range) and bin array (Bin Range). Excel Data Analysis ToolĮxcel Data Analysis Tool: To use Excel’s Histogram data analysis tool, you must first establish a bin array (as for the FREQUENCY function described in Frequency Tables) and then select the Histogram data analysis tool. You can use Excel’s chart tool to graph the data in Figure 1, or alternatively, you can use the Histogram data analysis tool to accomplish this directly, as described next. We start by replicating the data and bin section for Example 1 in Figure 1. A histogram is a graphical representation of the output of the FREQUENCY function (as described in Frequency Tables).Įxample 1: Create a histogram for the data and bin selection for Example 1 from Frequency Tables.
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