Abstract
We develop an approximate likelihood ratio test in this article and this test can be used to check if there is equality of several partial correlation coefficients or not using several independent multinormal samples. We also discuss about large sample χ2-test for the same problem. We compare the two tests based on their power and it is found that the approximate likelihood ratio (ALR) test consistently has more power than χ2-test. The ALR test has size slightly more than alpha level. We strongly recommend the ALR test for data analysis.
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