PakMediNet Discussion Forum : Biostatistics : Sample Size
Sample Size
Dear Friends
I want to calculate sample size for the three proportions
I have proportion of Best corrected visual Acuity for three types of surgeries
ECCE : 87
SICS : 91
PHACO: 96
Now I want to calculate sample size
Please help me
Karthik Prakash
Posted by: karthikPosts: 2 :: 11-06-2003 :: | Reply to this Message
Re: Sample Sizeu want to calculate it separately or together
Posted by: mehwishPosts: 18 :: 05-10-2005 :: | Reply to this Message
Re: Sample Size
use the formula :
p+- z(sd/underroot n) = e
Posted by: mehwishPosts: 18 :: 05-10-2005 :: | Reply to this Message