# varimax

0th

Percentile

##### Rotation Methods for Factor Analysis

These functions rotate loading matrices in factor analysis.

Keywords
multivariate
##### Usage
varimax(x, normalize = TRUE, eps = 1e-5)
promax(x, m = 4)
##### Arguments
x
A loadings matrix, with $p$ rows and $k < p$ columns
m
The power used the target for promax. Values of 2 to 4 are recommended.
normalize
logical. Should Kaiser normalization be performed? If so the rows of x are re-scaled to unit length before rotation, and scaled back afterwards.
eps
The tolerance for stopping: the relative change in the sum of singular values.
##### Details

These seek a rotation of the factors x %*% T that aims to clarify the structure of the loadings matrix. The matrix T is a rotation (possibly with reflection) for varimax, but a general linear transformation for promax, with the variance of the factors being preserved.

##### Value

• A list with components
• loadingsThe rotated loadings matrix, x %*% rotmat, of class "loadings".
• rotmatThe rotation matrix.

##### References

Hendrickson, A. E. and White, P. O. (1964) Promax: a quick method for rotation to orthogonal oblique structure. British Journal of Statistical Psychology, 17, 65--70.

Horst, P. (1965) Factor Analysis of Data Matrices. Holt, Rinehart and Winston. Chapter 10.

Kaiser, H. F. (1958) The varimax criterion for analytic rotation in factor analysis. Psychometrika 23, 187--200.

Lawley, D. N. and Maxwell, A. E. (1971) Factor Analysis as a Statistical Method. Second edition. Butterworths.

factanal, Harman74.cor.
library(stats) ## varimax with normalize = TRUE is the default fa <- factanal( ~., 2, data = swiss) varimax(loadings(fa), normalize = FALSE) promax(loadings(fa))