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	tadded python version of linear regression analysis - numtools - perform numeri…
	git clone git://src.adamsgaard.dk/numtools
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	---
	commit 0cc78918862ea2153868166130c2c4bf51ee5ae4
	parent 980e62e250ba67b8a2e89cf4160b85aa9c14372e
	Author: Anders Damsgaard <[email protected]>
	Date: Wed, 24 Nov 2021 14:40:40 +0100

	added python version of linear regression analysis

	Diffstat:
	A linregress \| 67 +++++++++++++++++++++++++++++…

	1 file changed, 67 insertions(+), 0 deletions(-)
	---
	diff --git a/linregress b/linregress
	t@@ -0,0 +1,67 @@
	+#!/usr/bin/env python
	+import sys, getopt
	+import numpy
	+import scipy.stats
	+
	+def usage(arg0):
	+ print("usage: {} [-h] [-s significance_level]".format(sys.argv[0]))
	+
	+def read2dstdin():
	+ input = numpy.loadtxt(sys.stdin)
	+ return input[:,0], input[:, 1]
	+
	+def reportregress(res):
	+ print("slope =\t{:5g}\nslope_stderr =\t{:5g}".format(res.slope, res.st…
	+ print("intercept =\t{:5g}\nintercept_stderr =\t{:5g}".format(res.inter…
	+ print("r_value =\t{:5g}\np_value =\t{:5g}\n".format(res.rvalue, res.pv…
	+
	+def reportsignif(p, significlvl):
	+ print("Checking null hypothesis using the Wald Test with t-distributio…
	+ print("The p-value is ", end="")
	+ if (p < significlvl):
	+ print("less than the significance level ({:g}),".format(signif…
	+ print("which means that the null hypothesis of zero slope is R…
	+ else:
	+ print("greater or equal than the significance level ({:g}),".f…
	+ print("which means that the null hypothesis of zero slope CANN…
	+
	+
	+def reportcorr(r):
	+ print("The correlation coefficient (r-value) denotes ", end="")
	+ if (abs(r) < 0.01):
	+ print("zero correlation.")
	+ else:
	+ print("a ", end="")
	+ if (abs(r) < 0.2):
	+ print("weak", end="")
	+ elif (abs(r) < 0.3):
	+ print("moderate", end="")
	+ elif (abs(r) < 0.4):
	+ print("strong", end="")
	+ elif (abs(r) < 0.7):
	+ print("very strong", end="")
	+ print(" positive" if r > 0.0 else " negative")
	+ print(" relationship.")
	+
	+def main(argv):
	+ significlvl = 0.05
	+ try:
	+ opts, args = getopt.getopt(argv, "hs:")
	+ except getopt.GetoptError:
	+ usage()
	+ sys.exit(2)
	+ for opt, arg in opts:
	+ if opt == "-h":
	+ usage()
	+ sys.exit(0)
	+ elif opt == "-s":
	+ significlvl = float(arg)
	+
	+ x, y = read2dstdin()
	+ res = scipy.stats.linregress(x, y, alternative="two-sided")
	+ reportregress(res)
	+ reportsignif(res.pvalue, significlvl)
	+ reportcorr(res.rvalue)
	+
	+if __name__ == "__main__":
	+ main(sys.argv[1:])