[ncl-talk] Query on escorc function page
Tess Parker
tess.parker at monash.edu
Mon Jul 18 05:51:30 MDT 2016
Hi -
I am using the documentation page for the escorc Pearson sample correlation
function: http://www.ncl.ucar.edu/Document/Functions/Built-in/escorc.shtml
** Under Example 1, two methods for the calculation and confidence limits
are given. Under the alternative method, the following is given:
An alternative for testing significance is:
t = r*log
<http://www.ncl.ucar.edu/Document/Functions/Built-in/log.shtml>((n-2)/(1-*r*^2))
p = student_t(t, df)
psig = 0.05 ; test significance level
print("t="+t+" p="+p) ; t=2.02755 p=0.0732238
** However, to calculate t (as stated further up on the page) one uses:
t = r*sqrt[ (*n*-2)/(1-r^2) ]
It seems then that the formula for t given in the alternative test is
wrong, in using the log rather than the sqrt?
Thanks as always for your help.
--
Tess Parker
Associate Researcher
School of Earth, Atmosphere and Environment
Room 225, Building 28
9 Rainforest Walk
Monash University, Clayton VIC 3800
http://users.monash.edu.au/~tess/index.html
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