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Diabetes Special Issue: Robin L Marcus, Sheldon Smith, Glen Morrell, Odessa Addison, Leland E Dibble, Donna Wahoff-Stice, and Paul C LaStayo Comparison of Combined Aerobic and High-Force Eccentric Resistance Exercise With Aerobic Exercise Only for People With Type 2 Diabetes Mellitus PHYS THER 2008; 0: ptj.20080124v1-0 [Abstract] [PDF]

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Threats to internal validity

Glenys L. Henderson   (3 December 2008)

Threats to internal validity 3 December 2008
Glenys L. Henderson, Physical Therapist OCS Send rapid response to journal: Re: Threats to internal validity glenyshenderson{at}gmail.com Glenys L. Henderson	Threats to internal validity such as compensatory rivalry are best controlled with blinding of the subjects. Convenience sampling is a form of nonprobability sampling and would be useful in assessing external validity.