Usama Al-sari

4 Questions 6 Answers 0 Followers

Questions related from Usama Al-sari

Is there any one familiar with back pain assessment by using the means of the Margolis pain drawing system?

Hi all How the Margolis pain drawing system (which each participant asked to shade according to whether they were currently experiencing pain) scored? and how one calculate the mean and...

27 January 2016 2,714 3 View

Does anyone have any grey literature regarding health related quality of life in patients with vertebral fracture ?

I have explored the published literature and wonder if anyone has non-indexed or unpublished data that they would be willing to share. I am looking for any information about the effect of...

28 July 2015 6,452 6 View

Is there any minimum number for studies that should be included in meta-analysis?

I do a meta-analysis under very specific criteria, however, I can’t find more than nine studies that fit my criteria, is that number acceptable and if not how many studies should I have? Indeed,...

17 May 2015 7,254 65 View

Var != 0 predicts failure perfectly?

I'm attempting to run a logit model on longitudinal data and am getting the message that one of my variables predicts failure perfectly. A number of observations are then excluded from the model...

04 February 2015 4,594 1 View