On the polarization factor for crystal-monochromated X-radiation. III. A weighting scheme for products

The minimum-variance weighting scheme for calculating the weighted mean of a quality for the following unusual case is analysed. The quantity is derived from the product of two independent quantities for each of the which a set of data is available. All the products between the two sets of data are taken into consideration. The application to measurements of the polarization state of X-radiation is outlined.