Inaamul Haq

5 Questions 23 Answers 0 Followers

Questions related from Inaamul Haq

Can someone share some Stata code for calculation and comparison of PPV and NPV of two tests in a paired design?

I have a case-control study with 200 cases and 200 controls (d == 0 for controls and d == 1 for cases). Two tests y1 and y2 are applied to each case and control and the results are coded 1 for a...

22 January 2022 8,889 4 View

Difference between two proportions in a paired design using Stata?

Two tests were applied to the same group of people. Both tests are binary (with 0 and 1 responses). I need to test the null hypothesis that the proportion of response 1 is equal in both...

17 January 2022 1,954 7 View

How do I compare change in a function measured using two different scales?

I am measuring lung function using FEV1 (%) and CT score (range 0-30) in 20 patients at time 0 and at one year of follow up. How should I test which of the two measures (FEV1% or CT Score) shows...

14 July 2017 7,548 3 View

How to calculate power in survival analysis?

A survival analysis has been conducted based on secondary data. How can we calculate power of the study to compare mean survival among two groups of patients? The data that I have is the mean...

21 April 2016 9,491 4 View

How do I calculate total score for WHOQOL-BREF?

How is the total score calculated in WHO QOL-BREF after having calculated the transformed scores for all four domains? Do we add them up or calculate a simple average? Or is there some other method?

21 August 2015 1,859 81 View