The following options are available for quantitative analysis:
By default, Match! uses the so-called "Reference Intensity Ratio" (RIR) method for quantitative analysis. As an alternative, you can also instruct Match! to use Toraya's "Direct Derivation" (DD) method instead, or to let Match! decide which one is more suitable for your current analysis task ("Automatic"; depending e.g. on the 2theta range that is available in the experimental data).
For semi-quantitative analysis using the RIR method, the program requires so-called "I/Ic" values (relative intensity ratios compared to corundum) to be present in the reference database for all entries that are selected as "matching". Normally, the semi-quantitative analysis cannot be performed if there is no I/Ic value for one (or more) of these entries.
However, in some cases it may be useful to assume I/Ic-values of 1.0 if no corresponding value is given in the reference database, so that a semi-quantitative analysis is nevertheless possible. Although this assumption leads to errors in the weight-percentage values of the compounds, these errors may be small if the phases for which I/Ic=1.0 is assumed are only present in small amounts.
If this option is active, the amounts of phases for which an I/Ic value of 1.0 has been assumed are marked by "(*)" in the Report.