Power calculations to get sample size needed to run an experiment

AI Thread Summary
The discussion focuses on conducting power calculations for an experiment examining the impact of household bargaining power on spending for children. The researcher is using STATA to determine the necessary sample size for a between-subject design with three treatments, comparing proportions of money spent on children across treatment groups. They are specifically using the command "sampsi 0.1 0.3, power(0.9)" to calculate sample sizes, assuming a significance level of 0.05. The researcher seeks confirmation on the appropriateness of their method and whether their approach to comparing treatment pairs is valid. Clarification on power calculations and STATA usage is requested to ensure accurate results for the experiment.
Charlotte87
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Hi everyone!

I am writing a paper in development/experimental economics concerning how household bargaining power (i.e. how much say the husband and wife has about how to spend household income) affect how much money is spent on children. I am going to conduct an experiment and is now in the phase of doing some power calculations in order to see how large sample I need. Unfortunately, I am having some problems doing these power calculations. I understand their purpose and everything, but I do not really see how I should use STATA to do the correct calculations.

I am doing a between-subject design with three treatments. In each treatment the money available will be varying. So, I think I need to do power calculations where I compare proportions since I will be comparing the share of money spent on children in each treatment group.

Even though I have three treatments, I will only compare two-and-two treatments. I will compre treatment 1 with treatment 2, treatment 1 with treatment 3 and treatment 2 with treatment 3. So far I have used the following command in STATA:

sampsi 0.1 0.3, power(0.9)

The significance level is then automatically 0.05, and 0.1 and 0.3 is proportions (i.e here the share of money spent on children). Does this make sense??

I have made a table comparing proportions from 0 to 1 (with a 0.1 intervals) and made a table, but I am still not sure whether my method is correct.
 
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