Statistics/Chi-squared distribution: Difference between revisions
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from math import gamma, exp |
from math import gamma, exp |
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from scipy.special import gammainc |
from scipy.special import gammainc |
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from matplotlib.pyplot import plot, legend, ylim |
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def χ2(x, k): |
def χ2(x, k): |
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print( |
print( |
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f'\nFor the airport data, diff total is {DTOTAL}, χ2 is {χ2(DTOTAL, 3)}, p value {cdf_χ2(DTOTAL, 3)}') |
f'\nFor the airport data, diff total is {DTOTAL}, χ2 is {χ2(DTOTAL, 3)}, p value {cdf_χ2(DTOTAL, 3)}') |
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X = [x * 0.001 for x in range(10000)] |
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for k in range(5): |
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plot(X, [χ2(p, k) for p in X]) |
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legend([0, 1, 2, 3, 4]) |
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ylim(-0.02, 0.5) |
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</syntaxhighlight>{{out}} |
</syntaxhighlight>{{out}} |
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[[File:Pyplotofchisquared.png|thumb|center]] |
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<pre> |
<pre> |
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x χ2 k = 1 k = 2 k = 3 k = 4 k = 5 |
x χ2 k = 1 k = 2 k = 3 k = 4 k = 5 |
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