In a statistical comparison of orthogonal normalized varimax factor analytic solutions for the MMPI-168 including and excluding invalid protocols of psychiatric inpatients, at least one factor reflection was observed. Factors identified were Psychotic Distortion (Absence of Distress), Somaticism, Depression, Extroversion, Masculinity-Femininity, and Low Morale. Factors obtained, and representative clinical scales, were consistent with those obtained by others in investigations of both abbreviated and standard MMPI forms. Statistical comparison of factors identified by the two analyses indicated congruence. Possible sources of factor distortion were discussed.