RT Book, Section
A1 Portney, Leslie G.
SR Print(0)
ID 1172485849
T1 Correlation
T2 Foundations of Clinical Research: Applications to Evidence-Based Practice, 4e
YR 2020
FD 2020
PB F. A. Davis Company
PP New York, NY
SN 9780803661134
LK fadavispt.mhmedical.com/content.aspx?aid=1172485849
RD 2020/11/29
AB Correlation is, by and large, a familiar concept. Pairs of observations, X and Y, are examined to see if they “go together.” For instance, we generally accept that heart rate increases with physical exertion, that weight loss will be related to caloric intake, or that weight loss will increase as the frequency of exercise increases. These variables are correlated in that the value of one variable is systematically related to values of the second variable, although not perfectly and to differing degrees. With a strong correlation, we can infer something about the second value by knowing the first. In Chapter 28, chi-square was used to look at the association between nominal variables. The purpose of this chapter is to introduce several correlation statistics for use with ordinal and ratio/interval data that can be applied to a variety of exploratory research designs.