RT Book, Section
A1 Portney, Leslie G.
A1 Watkins, Mary P.
SR Print(0)
ID 1138250314
T1 Validity of Measurements
T2 Foundations of Clinical Research: Applications to Practice, 3e
YR 2017
FD 2017
PB McGraw-Hill Education
PP New York, NY
SN 9780803646575
LK fadavispt.mhmedical.com/content.aspx?aid=1138250314
RD 2024/04/19
AB Measurement  validity  concerns  the  extent  to  which  an  instrument  measures  what  it  is  intended  to  measure.  Validity  places  an  emphasis  on  the  objectives  of  a  test  and  the  ability  to  make  inferences  from  test  scores  or  measurements.  For  instance,  a  goniometer  is  considered  a  valid  instrument  for  testing  range  of  motion  because  we  can  assess  joint  range  from  angular  measurements.  A  ruler  is  considered  a  valid  instrument  for  calibrating  length,  because  we  can  judge  how  long  an  object  is  by  measuring  inches  or  centimeters.  We  would,  however,  question  the  validity  of  assessing  low  back  pain  by  measuring  leg  length  because  we  cannot  make  reasonable  inferences  about  back  pain  based  on  that  measurement.