Tim Croudace tjc39@cam.ac.ukDepartment of Psychiatry

1- Senior Lecturer (Psychometric Epidemiology)2- Dept of Health Career Scientist (Public Health)3- Director of Research: The Psychometrics Centre, Cambridge

Newnham College, May 2008

From Data to Paper (via Stata)

[GHQ-12 Data]Croudace et al (2003) n=1000+

[GHQ-12 Data]summarize / genscore / codebook

[GHQ-12 Data]tab ghq*

[GHQ-12 Data]multihist ghq*

[GHQ-12 Data]multihist ghqscore

[GHQ-12 Data 1234]corrtab 6 items

[GHQ-12 Data 1234] corrtabitems and total score

Spearman (w/o p-values)

Sample n=250 at randomfrom n=1119

Rasch model (CML estimation)for 6 GHQ items (positive)

raschtest

Rasch model (CML estimation)for 6 GHQ items (positive)

Rasch model (CML estimation)for 6 GHQ items (positive)

icc

Rasch model (CML estimation)for 6 GHQ items (positive)

graph

Rasch model (CML estimation)for 6 GHQ items (positive)

info

Rasch model (CML estimation)for 6 GHQ items (positive)

fitgraph

Rasch model (CML estimation)for 6 GHQ items (positive)

split

Rasch model (MML estimation)for 6 GHQ items (positive)

method(MML)

Rasch model (MML estimation)for 12 GHQ items

Rasch model (MML estimation)for 12 GHQ items

Rasch model (MML estimation)for 12 GHQ items