Python - appending to multiple arrays

Question

If I wanted to perform something like Levene's test of equal variances via scipy stats, which produces two outputs (the test statistic and p-value) for all the data in a dictionary, how would I append the outputs for each test to two different lists? I tried the code below:

test_stat[]
p_value[]
for i in range(0, n_data):
    for j in range(1, n_name):
        test_stat[i], p_value[i] = scipy.stats.levene(data[i][name[j-1]],
                                                      data[i][name[j]],
                                                      center='median')

But this clearly isn't the way to go about it, as I keep getting anIndexError because the list assignment index out of range.

Any suggestions would be greatly appreciated. Thanks!

Blue Star · Accepted Answer · 2016-10-25 05:31:26Z

1

Not everything needs to be in a single line... This should work fine:

test_stats = []
p_values = []
for i in range(0, n_data):
    for j in range(1, n_name):
        test_stat, p_value = scipy.stats.levene(data[i][name[j-1]], 
                                                data[i][name[j]], 
                                                center='median')
        test_stats.append(test_stat)
        p_values.append(p_value)

Though of course this will add n_data * n_name rows.

answered Oct 25, 2016 at 5:31

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