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Annotation of imach/src/ChangeLog, revision 1.2

1.2     ! brouard     1: 2003-05-03    <brouard@BROUARD>
        !             2: 
        !             3:        * imach.c: Some cleaning
1.1       brouard     4: 2003-03-28    <brouard@BROUARD>
                      5: 
                      6:        * imach.c (Module): In version up to 0.92 likelihood was computed
                      7:        as if date of death was unknown. Death was treated as any other
                      8:        health state: the date of the interview describes the actual state
                      9:        and not the date of a change in health state. The former idea was
                     10:        to consider that at each interview the state was recorded
                     11:        (healthy, disable or death) and IMaCh was corrected; but when we
                     12:        introduced the exact date of death then we should have modified
                     13:        the contribution of an exact death to the likelihood. This new
                     14:        contribution is smaller and very dependent of the step unit
                     15:        stepm. It is no more the probability to die between last interview
                     16:        and month of death but the probability to survive from last
                     17:        interview up to one month before death multiplied by the
                     18:        probability to die within a month. Thanks to Chris
                     19:        Jackson for correcting this bug.  Former versions increased
                     20:        mortality artificially. The bad side is that we add another loop
                     21:        which slows down the processing. The difference can be up to 10%
                     22:        lower mortality.
                     23: 
                     24: 2002-05-30    <brouard@BROUARD>
                     25: 
                     26:        * 
                     27: 
                     28:        * imach.c (Module): Add correlation matrix of one-step
                     29:        probabilities and covariance matrix
                     30: