mirror of https://github.com/pyodide/pyodide.git
10 lines
449 B
Python
10 lines
449 B
Python
#from: http://stackoverflow.com/questions/20799403/improving-performance-of-cronbach-alpha-code-python-numpy
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#pythran export cronbach(float [][])
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#setup: import numpy as np ; N = 600 ; items = np.random.rand(N,N)
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#run: cronbach(items)
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def cronbach(itemscores):
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itemvars = itemscores.var(axis=1, ddof=1)
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tscores = itemscores.sum(axis=0)
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nitems = len(itemscores)
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return nitems / (nitems-1) * (1 - itemvars.sum() / tscores.var(ddof=1))
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