![]() For three or more time points or repeated conditions, we may use the repeated measures ANOVA which is equivalent to the one-way ANOVA for independent samples. The paired t-test is an analyzing method of correlated samples with two time points or occasions. Common characteristics of these repeated measurements include correlations of the data points obtained by the same object, person, tooth, etc. In the field of dentistry, we measure the periodontal pocket depths of a tooth repeatedly at different surfaces: buccal, lingual, mesial, and distal. ![]() In perspective of time, we may measure children's height repeatedly to know the growth pattern. ![]() With respect to conditions, e.g., treatment A, B, and C, different treatments may be applied to the same group of subjects repeatedly according to the designated time schedule to compare the effects of treatments. ![]() A simple example is a pre-post design to assess the intervention effect. Repeated measurements can be obtained in many situations. ![]()
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