Lecture 10: sample size and minimum detectable effect calculator

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2	3ie Sample size and minimum detectable effect calculator ©
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6	This worksheet is designed to be used alongside the manual, Power calculation for causal inference in social science:
7	sample size and minimum detectable effect determination (Djimeu and Houndolo 2016)
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11	7.1.1 Single level trial with continuous outcome variables
12	(refer to p.20 in the manual)
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14	Table 1.1: Sample size determination.
15	Instruction:	Specify the parameters in yellow to determine N
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17	Parameter	Value	Definition	Source of parameter - comments
18	α	0.05	Significance level
19	β	0.9	Desired power of the test
20	Tail	2	One-tailed or two-tailed test
21	min	500	The minimum sample size decided beforehand to determine t values
22		1	The pooled total standard deviation of the estimated effect on the outcome variable
23		0.5	The proportion of the study that is randomly assigned to the treatment group
24		0.25	Minimum detectable effect
25		1.96	T-value corresponding to the desired significance level of the test
26		1.28	T-value corresponding to the desired power of the design
27		675	The size of the study sample
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30	Table 1.2: Minimum detectable effect determination.
31	Instruction:	Specify the parameters in yellow to determine the minimum detectable effect
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33	Parameter	Value	Definition	Source of parameter - comments
34	α	0.05	Significance level
35	β	0.8	Desired power of the test
36	Tail	2	One-tailed or two-tailed test
37		1	The pooled total standard deviation of the estimated effect on the outcome variable
38		0.5	The proportion of the study that is randomly assigned to the treatment group
39		500	The size of the study sample
40		1.96	T-value corresponding to the desired significance level of the test
41		0.84	T-value corresponding to the desired power of the design
42		0.25	Minimum detectable effect
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46	Advisory: The worksheet is copyrighted by 3ie. Users are free to use and adapt for personal, non-commercial use. Any publication of any part or whole of the worksheet itself must be by permission, with credit given to 3ie. For questions, please contact info@3ieimpact.org
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