Usually, correlation can be measured between two ranked variables. Since the
independent variables are measured at the ordinal scale and the purpose of this study is to
examine the correlation between ordinal and ratio variables, ratio variables have to be
converted to ordinal variables. Although loss of information would be a problem in the
converting process, it would not be serious if large amoun ts of data were used. The
measure of correlation between two variables is the same as that between ratio variables.
The difference is only arithmetic, but there are po new principles (Meddis, 1984).