defined correlation test
as those
based
on the ratio
of two weighted least-squares estimates
of scale obtained
from order statistics.
The two estimates
are the normally distributed
weighted least squares estimates
and the sample variance
form other population.
Some of the regression and correlation test are Shapiro-Wilk test, Shapiro-Francia test and Ryan-Joiner test. Only the Shapiro-Wilk test is discussed in this paper