The most straightforward estimation of change between 2 occasions is the combined current estimator, ( widehat{overline{Y}} ), minus the mean calculated at previous occasion, ( {widehat{overline{X}}}_I ) widehat{overline{C}}=widehat{overline{Y}}_{wIdehat{overline{X}}}_I (10).
Mehsud, who had been "killed" by American drone strikes on at least two previous occasions, was actually killed by another drone strike at the start of November — transforming him overnight, in the eyes of Pakistani politicians and commentators, from a mass murderer into a martyr.
Israel has tried to kill him on at least four previous occasions.
But private vessels have been seized on at least three previous occasions, including one in April this year.
"Now we know the regime used chemical weapons on at least 14 previous occasions.
He was the No. 2 man in Hamas's armed wing, and Israel has been pursuing him for years, trying to kill him on at least four previous occasions.
His Chelsea obituary has been drafted on at least two previous occasions.
Mind you, on at least three previous occasions over the past 10 years, Dudley Borough Council has asked Dudley Muslim Association to switch sites, only for the alternative location to fall through.
In abandoning his home, Correa was doing something he'd never done before, despite having had good reason to do so on at least three previous occasions.
