I'm using pandas's example to do what I want to do:
>>> s = pd.Series([90, 91, 85])
>>> s
0 90
1 91
2 85
dtype: int64
then the pct_change() is applied to this series:
>>> s.pct_change()
0 NaN
1 0.011111
2 -0.065934
dtype: float64
okay, fair enough, but Percentage Increase = [ (Final Value - Starting Value) / |Starting Value| ] × 100
so the results should actually be [NaN, 1.11111%, -6.59341%].
how would I get this *100 part that the pct_change() didn't run for me?