[BUG] AutoETS
, UnobservedComponents
: fix predict_interval
for integer based index not starting at zero
#4180
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Fixes #4173, the index generation in
AutoETS
andUnobservedComponents
was wrong.Also extends the
test_predict_interval
to test integer based indices (the default_make_series
output starts at 3, not 0).This covers the fix - it has also highlighed the same buggy behaviour in
SquaringResiduals
which seems to have a different cause.As this is a different bug, it has been added to the bug tracker here #4181, and is excepted from tests temporarily.