Top ranking features using fscmrmr() have 0 for scores

Hi,

I used fscmrmr() on a dataset of 100 observations by 1000 features. The top 100 features have scores 0 where as the remaining features have some scores > 0. Is this normal?

Assuming the idx and scores below were already ranked.

[idx,scores] = fscmrmr(X,Y);

Many thanks

Answer 1

[Prince Kumar]

Hi,

Please have a look at the following example from fscmrmr for better understanding.

load ionosphere
[idx,scores] = fscmrmr(X,Y);
bar(scores(idx))
xlabel('Predictor rank')
ylabel('Predictor importance score')

One important thing to note is that idx and scores are in sorted order.

scores

scores = 1×34

0.0662 0 0.0214 0.0756 0.2905 0.0068 0.0345 0.0085 0.0128 0.0063 0.0023 0.0274 0.0079 0.0007 0.0145 0.0014 0.0018 0 0.0073 0 0.0141 0 0.0066 0.0310 0.0086 0 0.0098 0 0.0280 0.0072

idx

idx = 1×34

5 4 1 7 24 29 12 3 34 33 15 21 9 32 31 27 25 8 13 19 30 6 23 10 11 17 16 14 2 18

Hope this helps!