This is an internal function and is not usually called by user. This function computes naive chi-square test for the comparison of three or more survival curves at fixed points in time.
chisq.naive(st, ot.sq)
point estimates at fixed points in time
estimated variance
chi-square test statistic
Klein J.P., Logan B., Harhoff M., et al. (2007). Analyzing survival curves at a fixed point in time. Statistics in Medicine 26:4505--4519.
# NOT RUN {
# This is an internal function and is not usually called by user.
# }
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