PakMediNet Discussion Forum : Biostatistics : can you calculate it for me
can you calculate it for me
COMPARISON OF ROUTINE CYTOLOGICAL EXAMINATION AND ZIEHL-NEELSEN (ZN) STAINING (MODIFIED BLEACH METHOD) OF THE LYMPH NODE ASPIRATES IN DIAGNOSIS OF TUBERCULOSIS is the topic of my synopsis.
The prevalence of Tuberculosis in pakistan is ~1% and incidence is about 181/100000 persons per annum.Sensitivity of FNAC is 88% and Specificity is 96% in diagnosis of TB.
Please calculate sample size for me , i am already late for my synopsis and now stuck in this limbo.
Posted by: mk_awanpkPosts: 2 :: 21-06-2009 :: | Reply to this Message
Re: can you calculate it for me
Dear,
Your sample size is 139 patients using the following information,
at 1% prevalence, 5% level of significance and 5 % precision
Posted by: biostatPosts: 8 :: 18-07-2009 :: | Reply to this Message
Re: Re: can you calculate it for me
Dear asif
Can you please suggest any software for sample size calculation and where to download
Regards
Farooq
Posted by: drrathorePosts: 428 :: 20-07-2009 :: | Reply to this Message
Re: can you calculate it for me
WHO "Sample Size Determination in Health Studies" software
Good small software with examples ... esp. designed for users like us.
Posted by: docosamaPosts: 333 :: 09-08-2009 :: | Reply to this Message
Re: Re: can you calculate it for me
Dear Sir
Can you please give me a link to download this software...I tried to Google it out but couldn't find any download links
Regards
Farooq
Posted by: drrathorePosts: 428 :: 09-08-2009 :: | Reply to this Message
Re: Re: can you calculate it for me
"Your sample size is 139 patients using the following information, at 1% prevalence, 5% level of significance and 5 % precision"
BioStat:
Can you explain how you got to that magical number?
[Edited by siddiqi on 08-10-2009 at 05:15 PM GMT]
Posted by: siddiqiPosts: 19 :: 08-10-2009 :: | Reply to this Message
Re: can you calculate it for me
hi dear,
the calculation of sample size u are asking for can not be calculated on the basis of information u r giving, as it depends on ur objective and study design i will recomend you to consult cpsp regional centre for actual and proper calculation
or u can get help from 03224053157 in Islamad /Rawalpindi,
and anyone can get help regarding synopsis, research article and dissertation writing and data analysis for any purpose.
Posted by: M. AfzalPosts: 6 :: 02-11-2009 :: | Reply to this Message
Re: can you calculate it for me
In addition to Dr. Siddiqui, I am also interested in knowing some magic.
My favorite software is PS: Power and sample Size Calculator. It is available free of charge at http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize
There are some nice reference articles on this page.
However, knowing how to use a software doesn't mean that you will be calculating correct sample size. You either need to know sample size calculation well or need to work closely with a biostatistician.
Posted by: rqayyumPosts: 199 :: 22-11-2009 :: | Reply to this Message