Allocation concealment, prediction and selection bias [electronic resource] / David Torgerson.
Material type:![Film](/opac-tmpl/lib/famfamfam/VM.png)
Animated audio-visual presentation with synchronized narration.
Title from title frames.
Contents: Introduction to selection bias -- Allocation methods -- Evidence for subversion bias -- Restricted or simple randomization -- Problems with cluster randomization -- Evidence for selection bias in cluster trials.
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Mode of access: World Wide Web.