Power calculations to get sample size needed to run an experiment

  • #1

Main Question or Discussion Point

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.
 

Answers and Replies

  • #2
18,201
7,810
I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
 

Related Threads on Power calculations to get sample size needed to run an experiment

  • Last Post
Replies
13
Views
3K
Replies
15
Views
2K
Replies
23
Views
3K
  • Last Post
Replies
2
Views
24K
  • Last Post
Replies
4
Views
1K
  • Last Post
4
Replies
82
Views
8K
Replies
34
Views
8K
Replies
76
Views
7K
Replies
21
Views
3K
Top