In Chapter 4, Dealing with Outliers and Missing Data, there was an example of how to request a histogram and use it to examine the distribution of a field in the data. Here, we will expand on that by adding the normal curve for comparison purposes and making other modifications to explore the distribution in detail. To get started, navigate to Analyze | Descriptive Statistics | Frequencies and select AGE as the variable. In the Chart menu, specify a Histogram and check the box to show the normal curve.
This will produce a frequency table followed by a graph as follows:
By superimposing the normal curve ...
