Power Analysis- Help
Hey all, this is the first time I am initiating a thread and it’s nice to know that there are other people sharing similar difficulties. So, I’ll get to the point. I am having some difficulties getting my head around statistics and methodology.
I have read a lot of books and decided on my methods but the road-block is choosing the appropriate statistical test and the sample size. I am thinking about conducting survey with simple random method and then do regression analysis as it would be most suitable as per my research. But how do I do the power analysis and choose the sample size? How to I justify it? It’s really confusing to me.
Discuss your Dissertation 
davidbergeviin 6:23 am on March 8, 2016 Permalink |
Hey minttyt, I can understand how confusing it is to justify your research and statistical methods. If you want to select a sample size, then you can just find an online calculator for that. If you Google ‘online power/sample size calculator’ then you will find a whole load of different ones, so you should find one to suit!
terrywellch 6:03 am on March 9, 2016 Permalink |
I used an online power calculator, the one at
http://www.danielsoper.com/statcalc/ and also the one at
http://www.surveysystem.com/sscalc.htm.
I was using it for a correlation sample size calculation, I’m not sure if it does sample sizes for every different kind of analysis.
minttyt 4:47 am on March 11, 2016 Permalink |
Are these calculators efficient? And there’s no formula in it. I think if I use them, it won’t be that conclusive you know? Using a proper formula for the matter can be more valid. Can you refer me any book or paper regarding the same?
terrywellch 11:42 am on March 14, 2016 Permalink |
Sure, this is the first PDF I got on sample size formulas. Here’s the link:
Click to access PD00600.pdf
The formulas available on other sites are similar as well. Unfortunately, I don’t know any other books for calculating sample size, maybe you can ask your librarian? That might help