Zohaib Khan

10 Questions 10 Answers 0 Followers

Questions related from Zohaib Khan

How should one choose the number of clusters in the first stage of multistage random cluster sampling ?

I have to recruit a sample of 300 secondary sampling units (elements) from X number of Clusters ( primary sampling units), how do I determine X when my primary sampling frame has 93 clusters. I...

06 June 2018 3,046 5 View

How to interpret these very wide confidence intervals from a case control study?

We conducted an age and sex matched case control study (84 cases, 174 controls). The outcome was cancer X and the exposure of interest was Y. Sample size was calculated based on the prevalence of...

09 September 2016 5,489 7 View

What is the best learning resource for epi info 7 ?

There are two large documents, the epi info user manual and the epi informatics guide but i find them a bit lacking when it comes to explaining advanced statistical analysis. I want to analyze...

06 June 2016 8,792 6 View

How can one enable multiple choices (Mutually inexclusive) in epi info 7 ?

I can not seem to find any field(variable type) where I can enable multiple choices to be selected. I understand, I can make a group field and then put in check boxes for all my responses or I...

03 March 2015 9,677 3 View

Should I enter pre determined codes for answers as choices while designing a form in epi info or could the codes be assigned later to the responses?

I want to enter data which I have gathered through my study tool into epi info. I am designing the data form at the moment but am unsure whether I should include the answers as it is or just put...

01 January 2015 2,919 9 View

Any pointers/tools/resource on calculating a sample size for a multiple risk factor assessment case control study?

I am studying the role of a specific type of smokeless tobacco in the development of oral cancer, for my doctoral project, so originally we calculated a sample based on the exposure to this...

11 November 2014 1,764 5 View

How to calculate the the confidence intervals for a Mantel Haenszel stratified Odds ratio?

I am synthesizing some data from a few observational studies for a meta analysis later, I calculated a weighted odds ratio using the M.H method, however I am not sure how to calculate the...

11 November 2013 2,306 14 View

Calculating standard error of a log Odds ratio from confidence intervals?

Higher limit of C.I - lower limit of C.I / 3.92 is the formula I used, my question is that this gives me a standard error of the regular odds ratio as opposed as the Log odds ratio, so should I...

11 November 2013 9,264 2 View

Is there any alternative method to calculate weighted average of odds ratio?

Working with a meta analysis, I have to combine odds ratios from two different strata into one stratum, I know that M.H formula of calculating the weighted average of the odds ratios, however the...

10 October 2013 6,421 4 View

What are the steps in conducting a meta analysis of observational studies?

Can someone guide me in the direction of an elaborate paper or literature on a detailed step by step guide of how to conduct a meta analysis, especially if it is for observational studies.

10 October 2013 3,327 3 View