Normalized power

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## Normalized power
##
import pandas as pd
import numpy as np

def cycling_np(s):
	rolling      = s.dropna().rolling(30).mean().dropna()
	NP = round((((rolling**4).mean())**0.25),0)
	return(NP)

watts = pd.Series(np.asarray(GC.series(GC.SERIES_WATTS)))
np = cycling_np(watts)
print(np)