It is also apparent from Table 4 that 23 organizations did not operate a formal costing system. Given
the small number of firms not having formal costing systems it was considered inappropriate to use
logistic regression. However, the differences in the scores between the two groups were examined using
either Mann–Whitney or the t-tests for each of the selected contextual variables. The statistical output
indicated that firms operating formal costing systems had significantly greater levels of support diversity,
volume diversity, annual sales and proportion of indirect costs and also attached greater importance to
cost information (p < .05).