Performs a permutation test to assess variability among groups in data with non-normally-distributed variance
| 1 2 3 | 
| n | Number of permutations | 
| d | Data frame to permute | 
| cat_var | Name of categorical (independant) variable, as a string. Should work as a column number as well. | 
| data_var | Name of random (dependant) variable, as a string. Should work as a column number as well. | 
| print_hist | If 'true', plot the histogram of F values. | 
| save_hist | If 'true', save the histogram of F values | 
| title | Title of the histogram | 
| fn | Filename, as a string, to save the histogram | 
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