Posts by Andy Grogan-Kaylor
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Measure for Measure Series – More is Not Always Better: When calculating impact, the sample size may be smaller than you think
How many people should I include in my assessment sample? This is a central issue for any organization thinking about doing impact assessment. Very large samples may be too expensive for your organization to collect. Overly small samples may fail to provide confidence that any impacts that you find are statistically significant.
- Impact Assessment