## Majorization as a tool for optimizing a class of matrix functions.(English)Zbl 0733.62067

The paper considers the monotonic minimization over X(n$$\times p)$$ of the trace function $f(x)=c+tr AX\quad +\sum^{m}_{j=1}tr B_ jXC_ jX',$ where c is a scalar independent of X, A(p$$\times n)$$, $$B_ j(n\times n)$$, and $$C_ j(p\times p)$$. The optimization problem is related to fitting statistical models by least squares. Three cases are considered: unrestricted X, $$X'X=I_ p$$ (columnwise orthogonal X), and $$rank(X)<\min (n,p)$$ (case of reduced rank). The approach is to majorize this function by one having a simple quadratic shape and whose minimum is easily obtained.
“It is shown that the parameter set that minimizes the majorizing function also decreases the matrix trace function, which in turn provides a monotonically convergent algorithm for minimizing the matrix function iteratively. Three algorithms based on majorization for solving certain least squares problems are shown to be special cases. In addition, by means of several examples, it is noted how algorithms may be provided for a wide class of statistical optimization tasks for which no satisfactory algorithms seem available.” (Author’s abstract.)

### MSC:

 62H25 Factor analysis and principal components; correspondence analysis 62H99 Multivariate analysis 90C90 Applications of mathematical programming
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### References:

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