Compute the estimate of the covariance of the statistic in test gLRT1
The function computes the estimate of the covariance of test statistics of the test proposed by Zhao and Sun (2004).
It is not to be called by the user.
Qiang Zhao and Jianguo Sun
Q. Zhao and J. Sun (2004), "Generalized Log-rank Test for Mixed-Censored Failure Time Data", Statistics in Medicine, 23: 1621-1629.
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