Comparison of STURLA classification results from current and previous studies
Permutational t-tests with Bonferroni correction were used to test for differences between cities in STURLA classes. The permutational t-test was used because we test data representing the population rather than a sample. The null hypothesis of the permutational t-test is that STURLA class composition does not differ between the cities. Permutational Pearson correlations were conducted to determine if the cities distribution of STURLA classes were similar between cities. These tests were conducted in R using the package “RVAideMemoire” (Hervé, 2020).