Gourab Dewan

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Questions related from Gourab Dewan

What percentage of Hemoglobin E is required in electrophoresis to classify as trait?

Today i received a hemoglobin electrophoresis report. Patient was suspected to have Hb E trait / disease. Report: HbA 94.4%, HbE 3.2%, HbA2 is 2.4%. At the end comment says- "there is an...

10 February 2019 9,304 6 View

How to use population proportion for sample size estimation?

When determining sample size we require population proportion (p) for a dichotomous outcome that to be measured (at 95% CI , 3% error ). If the proportion (p) is unknown a conservative estimate of...

22 December 2016 5,902 2 View

How to test reliability of two way close ended (yes /no) question based knowledge scale?

Likert scale used to asses attitude or opinion of participants. Reliability of such a scale is assessed by Cronbach's alpha test. Now to create a knowledge score on vaccine preventable diseases....

12 November 2016 546 3 View

In performing studies with finite population we have separate equation for sample size calculation. whether obtained result can be genaralized ?

Suppose i want to check smoking habit among physicians of certain country. There are 20 thousand (N) physician. We cannot include all.One way is i can take representative sample from 20 thousand....

03 November 2016 5,504 6 View

Suppose you want to calculate allele frequency of ABO system in a population of 1000 using Hardy-Weinberg formula. What will be minimum sample size ?

Is there any formula which is needed to fix sample size for calculation of allele or genotypic frequency of a certain trait (eg ABO blood group) using Hardy-Weinberg formula? if so for the...

11 June 2016 1,715 4 View