pca and princomp what is pca mean can isomap pca yield residual variance what is the difference between isomap and isomap r what is princomp function what is isomap residual variance how many data points in pca isomap residual variance when do you compare isomap and isomap pca variance isomap what is residual variance in parametric arithmetic what is residual variance can you use isomap instead of pca in r can r pca variance be calculated using isomap how to compare isomap residual variance can i compare pca variance to isomap what is isomap residual variance isomap residual variance how to compare isomap variability with standard deviation variance when using princomp function is variance measured