Theoretical evaluation of the overall values of discrepancy indices for truncated data. I. Normalized R indices for a centrosymmetric crystal with similar atoms

Theoretical expressions for the local values of six types of normalized R indices applicable to truncated data are derived for a centrosymmetric crystal by taking the model structure to be of the imperfectly related incomplete type. These indices are tabulated as functions of σ_A and y_t. These results can be used to obtain the overall values of the R indices applicable to truncated data which is characterized by a given value of y_t.