The Problem of Measurement Equivalence or Invariance in Instruments

The purpose of this study is to discuss the validity equivalence in sample groups young and adult; females males scale assessing attitudes towards foreign language skills offer researchers that will use certain evidence based on data. No measurement equivalence/invariance was found adult groups. Consequently, gender variable not present, either. absence fact a fundamental proof instrument specific group it intended for. For reason, should evaluate cross-validity or multi-group analyses basis traits are measured using instrument. It always negative have during process gathering evidences.