data convertion

  1. M

    Conversion from low vs. high to high vs. los (Relative Risk)

    Hi :) I'm writing my bachelorthesis about the effects of physical activity in prevention. Most of the studies I included compared high physical activity with low physical activity (as reference category) but a few did it the other way round and compared low physical activity with high physical...
  2. kiton

    Need help with the code to create a signle data file out of 1,200 txt's

    Hello dear forum members, My data include roughly 1,200 *.txt files, where (a) * is a 3 to 7 digit non-consecutive number representing participant's id, and (b) the contents of the file is participant's response -- text ranging from 5 to 500 words. What will be the code to create a single...
  3. T

    table transformation

    Hi I have the following table UserId,timetaken,timestamp 1,323,2/2/2014 12:11:07 AM 2,3234,2/2/2014 1:11:07 AM 3,6543,2/2/2014 2:11:07 AM 1,323,2/2/2014 3:11:07 AM 2,3234,2/2/2014 4:11:07 AM 3,6543,2/2/2014 5:11:07 AM i need to transform it to where userid becomes column...
  4. B

    Conversion of data from numerical to groups for Chi2 test in R Cmdr - PLEASE help

    Hi :) I need to make a chi2 test to see if the frequencies of specific genotypes are associated with BMI (body mass index). I believe that I need to perform a Chi2 test, where BMI is divided into groups (25-30 = overweight, 30< = obese). Is that true? My problem is that I don't know how to...