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2003-03-28    <brouard@BROUARD>

	* imach.c (Module): In version up to 0.92 likelihood was computed
	as if date of death was unknown. Death was treated as any other
	health state: the date of the interview describes the actual state
	and not the date of a change in health state. The former idea was
	to consider that at each interview the state was recorded
	(healthy, disable or death) and IMaCh was corrected; but when we
	introduced the exact date of death then we should have modified
	the contribution of an exact death to the likelihood. This new
	contribution is smaller and very dependent of the step unit
	stepm. It is no more the probability to die between last interview
	and month of death but the probability to survive from last
	interview up to one month before death multiplied by the
	probability to die within a month. Thanks to Chris
	Jackson for correcting this bug.  Former versions increased
	mortality artificially. The bad side is that we add another loop
	which slows down the processing. The difference can be up to 10%
	lower mortality.

2002-05-30    <brouard@BROUARD>

	* 

	* imach.c (Module): Add correlation matrix of one-step
	probabilities and covariance matrix