how to divide ordinal variables how to collapse ordinal variables into significant variables can you collapse ordinal values how to calculate tgrade in gbsg what is tgrade how to collapse ordinal data into significant values for anova? tgrade is collapsed into can pnodes be collapsed into more than two ordinal values how to collapse ordinal variables into two how do you collapse an ordinal variable how to use tgrade in Cox how to collapse ordinal variable how to collapse an ordinal variable and change into a difference can you collapse ordinal values into multiple values how to collapse an ordinal variable how to collapse ordinal data how to collapse ordinal values how to reduce ordinal values how to collapse ordinal variable how to calculate ordinal value of a table