C. Roberts

发表

The effect of a direct payment or a lottery on questionnaire response rates: a randomised controlled trial

D. Torgerson, B. Sibbald, P. Roberts, 2000, Journal of epidemiology and community health.

Increasing response rates to postal questionnaires. Effect of incentives on response rates must be considered.

D. Torgerson, B. Sibbald, P. Roberts, 2002, BMJ.

Baseline imbalance in randomised controlled trials

C Roberts, D J Torgerson, D. Torgerson, 1999, BMJ.

Depression as a risk factor for ischaemic heart disease in men: population based case-control study

C Roberts, B Sibbald, J. Hippisley-Cox, 1998, BMJ.

Randomisation methods: concealment

David J Torgerson, D. Torgerson, Chris Roberts, 1999, BMJ.

Randomisation methods in controlled trials

D. Torgerson, C. Roberts, D. Torgerson, 1998, BMJ.

Modelling method comparison data

G Dunn, G. Dunn, G. Dunn, 1999, Statistical methods in medical research.

Comparison of out of hours care provided by patients' own general practitioners and commercial deputising services: a randomised controlled trial. II: the outcome of care

M. Roland, S. Campbell, D. French, 1997, BMJ.

The implications of variation in outcome between health professionals for the design and analysis of randomized controlled trials.

C. Roberts, C Roberts, C. Roberts, 1999, Statistics in medicine.

Randomising groups of patients

C. Roberts, Bonnie Sibbald, 1998, BMJ.

Is follow up by specialists routinely needed after elective surgery? A controlled trial.

M. Roland, C. Roberts, J. Bailey, 1999, Journal of epidemiology and community health.