Pedro Emmanuel Alvarenga Americano do Brasil

5 Questions 23 Answers 0 Followers

Questions related from Pedro Emmanuel Alvarenga Americano do Brasil

How to use QUADAS2 to evaluate the original DTA research with latent class analysis?

I am conducting a systematic review of a diagnostic test and some of the original research using latent class analysis as the "reference test". When using QUADAS2 as the tool for risk of bias...

01 January 2014 2,799 1 View

Mixed effect model without a grouping/cluster variable for random effect: does it make sense?

A colleague of mine and I are trying to reproduce an example (and we are stuck) from the following paper: Haobo Ren , Xiao-Hua Zhou & Hua Liang (2004): A Flexible Method for Estimating the ROC...

05 May 2013 5,147 4 View

How to run a meta-analysis of medians and IQR?

I'm involved in a meta-analysis where some trials outcomes are shown in mean and standard deviation and some are shown as median and inter-quantile range. As softwares' functions require the group...

04 April 2013 4,062 23 View

How to estimate reasonable sample size for prediction model validation?

Recently a collaborator came with a project which aims to validate at his setting some prediction models for digestive bleeding. They are the rockall score, glsagow blatchford score, AIMS65 score,...

10 October 2012 3,752 14 View

How to test causal diagrams?

Before coming to this post I did take a look at Rothman's book and Sklo's book, but not very iluminating so far. Recently I was challenged with a problem of causal diagrams. A partner o mine came...

09 September 2012 6,410 8 View