The log-rank test is a direct by-product of the Mantel-Haenszel procedure. The Mantel-Haenszel...

The log-rank test is a direct by-product of
the Mantel-Haenszel procedure.

The Mantel-Haenszel procedure is used to
summarize associations across independent tables.

(a) If we consider the log-rank test as a
special case of the Mantel-Haenszel procedure, how many tables will we be
summarizing?

(b) The Mantel-Haenszel procedure is useful
when the association is consistent across tables. With this in mind, explain
when the log-rank test is useful.