05/01/2018 · What is an ex post factor
...n living in the home; number of single parent households; etc.). This matching procedure permitted use of an ex post facto design without the usual risk of spurious variables confounding the results (=-=Meehl, 1970-=-). Instruments (25) Revised Class Play (RCP). The RCP (Masten, Morison, & Pellegrini, 1985) is a descriptive matching instrument on which children or teachers are asked to "cast" classmates or student...
27 steps of ex post facto research the process of ex
And in the approach (after the fact),
everything has already happened so the independent
variable has to be statistically not physically manipulated.
The ex post facto approach is sometimes referred to as
research or as .
Over the past five years, however, there has been a subtle shift in the scientific consensus. It used to be that even considering the possibility of the alternative hypothesis, let alone researching it, was tantamount to quackery by association. Now a small but growing minority of establishment researchers have come to take seriously what the low-carb-diet doctors have been saying all along. Walter Willett, chairman of the department of nutrition at the Harvard School of Public Health, may be the most visible proponent of testing this heretic hypothesis. Willett is the de facto spokesman of the longest-running, most comprehensive diet and health studies ever performed, which have already cost upward of $100 million and include data on nearly 300,000 individuals. Those data, says Willett, clearly contradict the low-fat-is-good-health message ''and the idea that all fat is bad for you; the exclusive focus on adverse effects of fat may have contributed to the obesity epidemic.''