missing data in a clinical psychology study why is the psychopathology scale missing which scales do researchers use in psychoanalysis why are missing data important research where was missing data in the longitudinal study? why is one scale missing in a longitudinal clinical study how many years are there in this study why is an average psychological scale missing how to find missing data in a clinical psychology study in an interview which scales can miss data how many psychological scales in a longitudinal study why is it necessary to collect all of the scales of a psychological survey? why are psychological scales missing in psychology missing data psychology definition why is data missing in a study which psychologists use scales to measure symptoms what are missing variables in psychometrics why are psychopathological scales missing what does missing data mean missing data causes