Repeated measures design is a research design that involves multiple measures of the same variable taken on the same or matched subjects either under different conditions or over two or more time periods for instance repeated measurements are collected in a longitudinal study in which change over time is assessed. When experimental units over time are given each of the treatment levels then we have a cross over design a special case of repeated measures in ordinary repeated measures we are simply looking at multiple repeat measurements on the experimental units through time having been assigned to receive a treatment level. An ordinary repeated measures is where patients are assigned a single treatment and the results are measured over time eg at 1 4 and 8 weeks a crossover design is where patients are assigned all treatments and the results are measured over time the most common crossover design is two period two treatment. Repeated measures designs crossover studies the crossover design is by far the most common type of repeated measures design based around ensuring that all of the subjects receive all of the treatments in an experiment with two treatments the subjects would be randomized into two groups the first group would be given treatment a
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