RT Book, Section
A1 Portney, Leslie G.
SR Print(0)
ID 1186214744
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=1186214744
RD 2023/06/06
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.