fit preferred model one lowest aic value math mathit aic k ln l math ''k'' number parameters statistical model ''l'' maximized value likelihood model root mean square error approximation rmsea fit index value zero indicates best fit guideline determining close fit using rmsea highly contested researchers concur rmsea indicates poor fit ref name browne standardized root mean residual srmr srmr popular absolute fit indicator
Applied science Library and museum studies Statistics Structural Equation Model