Re: Re: Re: Re: Re: Re: Re: Re: How to Calculate Sample Size?

Yes sir, you are right. We all appreciate your sincere efforts.

Posted by: tariqaslPosts: 42 :: 06-05-2012 :: | Reply to this Message

Re: Re: Re: Re: Re: Re: Re: Re: Re: How to Calculate Sample Size?

Thanks sir

Posted by: ibrahim_apPosts: 138 :: 10-05-2012 :: | Reply to this Message

Re: Re: How to Calculate Sample Size?

I am sorry I have seen the problem just now.
Could you please let me know the formula WHO 2.2a which you referred in your message.
In order to calculate the sample size for case control studies standard formula uses power (we call it beta) among other things. Kindly send me all the information you have so that I can comment on the sample size.
By the way your calculated value of OR=0.49 means exposure may be negatively associated with disease (less risk among the exposed).

Anwer

Posted by: anwer_khurPosts: 30 :: 23-05-2012 :: | Reply to this Message

How to Calculate Sample Size?

aoa, i have noted that 380 is a reasonable, maximum sample size with 5% of margin of error with 95% confidence, if im right why not to take this as common sample size?

Posted by: wazi1Posts: 3 :: 24-06-2012 :: | Reply to this Message

Help Needed: How to Calculate Sample Size?

I want to do a study to find out normative data of some cell count in our population.

Previous study shows Mean cell count of 2641cells per person with SD of 341 cells. What should be the sample size to do study with 95% CI , 90% study power and acceptle cell count error of 100cells.

How and where I can get sample size calculater for this sample?

Posted by: EyeQ71Posts: 2 :: 01-07-2012 :: | Reply to this Message

Re: Help Needed: How to Calculate Sample Size?

The required sample size is 91

Posted by: ibrahim_apPosts: 138 :: 14-07-2012 :: | Reply to this Message

Re: How to Calculate Sample Size?

Posted by: shehaniPosts: 2 :: 23-09-2012 :: | Reply to this Message

Re: Re: How to Calculate Sample Size?

I am going to calculate simple size for a national study. Prevalence of a disease is estimated . 03% how i should calculate the sample size with 95% CI and 80 degree of power

Posted by: malalaPosts: 2 :: 30-07-2013 :: | Reply to this Message

Re: Re: How to Calculate Sample Size?

i need help in calculation of sample size for my study..anybody to help me..whatever i studied for it is very statistical terms,,i m unable to understand..please if anybody can help me in this.

Posted by: mayahassanPosts: 3 :: 28-01-2014 :: | Reply to this Message