Single-factor repeated measures design
This chapter deals with the influences on the score obtained by a particular individual subject under a particular condition. It discusses the principles of analysis of variance for the single-factor repeated measures design. The chapter presents convenient formulae for hand calculation of the analysis and explores the assumptions which underlie the analysis of this design are identified and discussed. It shows that a precise mathematical model is assumed which relates the independent variable to the dependent variable. The dependent variable, on which all four subjects were measured three times, was the length of time they could balance a dowel rod on the index finger of the left hand. Measurements were made, in succession, while subjects were silent, speaking or humming. The reliability variance can be estimated from the amount of variation shown by individual subjects from measurement to measurement not otherwise accounted for.