@article{Brouwer_1992, title={Validity: Q vs. R}, volume={16}, url={https://ojs.library.okstate.edu/osu/index.php/osub/article/view/9024}, abstractNote={<p>This study deals with political ideology, in the form of Q sorts of 80 <br>self-referent statements provided by more than 50 respondents, the P set<br>being cross-sectional. The resulting data set was split up into three <br>equivalent P samples, each of which was submitted independently to Q <br>factor analysis. Also, it was split up into four equivalent item <br>samples, each of which was submitted independently to R factor analysis.<br>Comparison of Q analysis loadings with R analysis z-scores and of Q <br>analysis z-scores with R analysis loadings shows a limited amount of <br>cross-validity. With respect to (meta-)reliability, the three cases of Q<br>factor analysis are strikingly similar; the fours cases of R factor <br>analysis, however, turn out to be rather dissimilar.</p>}, number={1/2}, journal={Operant Subjectivity}, author={Brouwer, Marten}, year={1992}, month={Oct.} }