Python – Non-Central T-Distribution in Statistics
Last Updated :
10 Jan, 2020
scipy.stats.nct() is a non-central T distribution continuous random variable. It is inherited from the of generic methods as an instance of the rv_continuous class. It completes the methods with details specific for this particular distribution.
Parameters :
q : lower and upper tail probability
x : quantiles
loc : [optional]location parameter. Default = 0
scale : [optional]scale parameter. Default = 1
size : [tuple of ints, optional] shape or random variates.
moments : [optional] composed of letters [‘mvsk’]; ‘m’ = mean, ‘v’ = variance, ‘s’ = Fisher’s skew and ‘k’ = Fisher’s kurtosis. (default = ‘mv’).
Results : non-central T distribution continuous random variable
Code #1 : Creating non-central T distribution continuous random variable
from scipy.stats import nct
numargs = nct.numargs
a, b, c = 4.32 , 3.18 , 4.2
rv = nct(a, b, c)
print ( "RV : \n" , rv)
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Output :
RV :
scipy.stats._distn_infrastructure.rv_frozen object at 0x000002A9D8084A48
Code #2 : non-central T distribution continuous variates and probability distribution
import numpy as np
quantile = np.arange ( 0.01 , 1 , 0.1 )
R = nct.rvs(a, b, c)
print ( "Random Variates : \n" , R)
R = nct.pdf(a, b, c, quantile)
print ( "\nProbability Distribution : \n" , R)
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Output :
Random Variates :
10.734219988162534
Probability Distribution :
[0.18980575 0.19386073 0.19754338 0.20077949 0.20348937 0.20558859
0.2069891 0.20760081 0.20733365 0.20610023]
Code #3 : Graphical Representation.
import numpy as np
import matplotlib.pyplot as plt
distribution = np.linspace( 0 , np.minimum(rv.dist.b, 3 ))
print ( "Distribution : \n" , distribution)
plot = plt.plot(distribution, rv.pdf(distribution))
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Output :
Distribution :
[0. 0.04081633 0.08163265 0.12244898 0.16326531 0.20408163
0.24489796 0.28571429 0.32653061 0.36734694 0.40816327 0.44897959
0.48979592 0.53061224 0.57142857 0.6122449 0.65306122 0.69387755
0.73469388 0.7755102 0.81632653 0.85714286 0.89795918 0.93877551
0.97959184 1.02040816 1.06122449 1.10204082 1.14285714 1.18367347
1.2244898 1.26530612 1.30612245 1.34693878 1.3877551 1.42857143
1.46938776 1.51020408 1.55102041 1.59183673 1.63265306 1.67346939
1.71428571 1.75510204 1.79591837 1.83673469 1.87755102 1.91836735
1.95918367 2. ]
Code #4 : Varying Positional Arguments
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace( 0 , 5 , 100 )
y1 = nct .pdf(x, 1 , 3 , 5 )
y2 = nct .pdf(x, 1 , 4 , 4 )
plt.plot(x, y1, "*" , x, y2, "r--" )
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Output :
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