Sample for an Impact Evaluation

This topic contains 2 replies, has 1 voice, and was last updated by   Fabiola Lara 4 months, 1 week ago.

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    Fabiola Lara
    Keymaster

    For an impact evaluation, what are some things I need to consider when thinking about my sample size?

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  • #3466 Reply

    Fabiola Lara
    Keymaster

    With an impact evaluation, you are typically trying to determine whether an intervention has had a significant effect on the treatment group compared to some kind of control or comparison group. You need a sample size that is large enough to conduct the statistical tests to determine the magnitude of the difference between the two groups.

    #3592 Reply

    Fabiola Lara
    Keymaster

    Lauren Pisani, Research Advisor with Save the Children, replied:

    With an impact evaluation, you are typically trying to determine whether an intervention has had a significant effect on the treatment group compared to some kind of control or comparison group. You need a sample size that is large enough to conduct the statistical tests to determine the magnitude of the difference between the two groups, a small group of children will not be enough to come to a strong conclusion. Also, if the intervention period is short, you may not find substantial changes in children’s skills over this short time. If this is the case and you have a short time period, you could use IDELA to get a general sense of the skills that children in your program possess but it will not be an impact evaluation.

    • This reply was modified 4 months, 1 week ago by   Fabiola Lara.
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