BIOCH499A Chapter 7-10: Chapters 7-10.pdf
14 Feb 2014
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In these chapters, we will quickly talk about. The purposes of regression and correlation analysis, How to compute and to interpret a correlation coefficient, How to compute and to interpret regression equations, How to predict the outcome of a variable, extrapolating, Chapters 7 10: exploring relationship between variables - Definition: a scatter-plot is a graphical display for two quantitative variables. It uses the horizontal axis for the explanatory variable x and the vertical axis for the response y. The values of x and y for a subject are represented by a point relative to the two axes. The observations for the n subjects are n points on the scatter-plot. Example 1: find the scatter-plot of the following data. Definition: two quantitative variables are said to have a positive association when high value of x tend to occur with high value of y, and when low values of x tend to occur with low values of y.
