Summary statistics provide a quick summary of data and are particularly useful for comparing one project to another, or before and after.
There are two main types of summary statistics used in evaluation: measures of central tendency and measures of dispersion.
Measures of central tendency provide different versions of the average, including the mean, the median and the mode.
Measures of dispersion provide information about how much variation there is in the data, including the range and the standard deviation.
- Calculating the Mean and Standard Deviation with Excel - This tool provides step by step instructions accompanied by screenshots on how to calculate the mean and standard deviation with excel.
- Pathway Courses: Module 1: Descriptive Statistics in Evaluation - This website offers a self paced online module which examines alcohol and marijuana use case studies to produce descriptive statistics including the mean and standard deviation.
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