Example data in the file "KB.DAT" are taken from
Tables 2.5 and 2.8 of "Test Equating Methods and Practices" by
Michael Kolen and Robert Brennan.

The contents of the columns of "KB.DAT" are:
Column 1: number correct raw score.
Column 2: frequency distribution for Form X (from Table 2.5)
Column 3: frequency distribution for Form Y (from Table 2.5)
Column 4: scale scores for Form Y (from Table 2.8)
