Saima Afaq

10 Questions 18 Answers 0 Followers

Questions related from Saima Afaq

Are there any principles for translating a written medium of communication into visual medium of communication?

Hi, I am conducting a clinical trial in rural area of developing country with low education level and no reading/writing skills. We will be providing them some instructions to follow during the...

13 September 2018 8,387 1 View

Case control matching in R (or spss), based on age, sex and ethnicity?

Hi, I have a data frame that includes people who developed end stage renal disease (ESRD) and those who didn't (controls). I want to match my cases with controls based on age, sex and ethnicity....

27 February 2018 2,067 5 View

How to apply survival analysis on data with variable follow up times for participnats?

Hi, I am looking at a longitudinal study of two ethnic populations. they were first seen/recruited at time T1. The total number of participants was 30k. out of these 15k were then followed up at...

22 January 2018 9,665 4 View

Meta-analysis of non-overlapping strata-The Mantel-Haenszel Formula?

I have stratified my results according to Ethnicity (south asians and Europeans), Gender (Male and female) and Age (4 different age groups). So I have a Beta value (from regression) for South...

15 October 2016 2,485 2 View

How to assess accuracy of prediction model?

Hi, Can any one suggest a statistical test to determine the accuracy of a prediction model? The prediction model has been developed using multiple linear regression and the variables are...

09 September 2016 5,023 19 View

Calibration of physical activity questionnaire using Accelerometer?

Hi, I have leisure time physical activity data and I want to calibrate it against physical activity accelerometer (Actigraph GT3X+). Once I get the questionnaire calibrated I will use those...

02 August 2016 2,171 10 View

Autocalibration of physical activity accelerometers?

I need some help infact a lot of help undersating the autocalibration procedure of physcial activity acceleromters. I have been reading a paper by van hees et al, JAP 2014. but struggling to...

24 June 2016 1,757 9 View

ACSM metabolic equation and ethnicity?

Has the ACSM equation for measuring energy expenditure (Vo2max and Met equivalents) been validated in different ethinicties (including South Asians)? Thanks Saima

21 May 2016 1,574 1 View

Validation of the ACSMs equation for measuring energy expenditure?

Is there any validation study available for the ACSMs equation for measuring Metabolic equivalents (workload/energy expenditure) during the exercise treadmill test please? Ideally with...

11 May 2016 7,470 2 View

Distribution of variables and sensitivity analysis?

Hi, I am trying to find the relationship between physical activity and glucose levels using multivariate linear regression. Glucose levels is the dependent variable and physical activity measuere...

05 May 2016 6,712 6 View