[Fabiola Lara]

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

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[Fabiola Lara]

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.

[Fabiola Lara]

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 5 years, 5 months ago by Fabiola Lara.

[Dang Vu Trung]

Hi Lara,
I am looking for a well designed Impact Evaluation using IDELA tools.
Thank for sharing of such resources.
Very best,
Trung

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