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SSASIM output file .COH

 --- .COH file contains life-expectancy and low-benefit thresholds for
          cohort individuals born in COHORT.birth_year.
          NOTE: this output file is not available in the OLC
          mode of model operation.
 
 scenar (1)
 Average remaining life at age 65 (female/male): (2-3)
 (assuming dynamic mortality rates over individual life)
 "arl65f", "arl65m",
 NOTE: computed only for cohorts who turn 65 in year >= RUN.year_zero
       for cohorts who turn 65 before RUN.year_zero, arl set to zero
 
 > Using arl65f and arl65m to set deterministic death ages:

 Don't make the mistake of adding the average remaining life at
 age 65 to 65 to get a deterministic death age for a cohort
 individual.  The proper procedure is to add one less than the
 average remaining life to 65, or add the full average remaining
 life to 64, which ever is easier to remember, to get the
 deterministic death age for a cohort individual.  The reason for
 this is that cohort individuals are assumed to die at the very
 end of a year, just before they have their next birthday, and
 after they receive program benefits for that age.  In other
 words, they get benefits in the year they die.  Since the average
 remaining life at age 65 is calculated at the sixty-fifth
 birthday which occurs at the start of the year, a one-year life
 means the individual died at the end of the year just before
 his/her sixty-sixth birthday.  So, the death age is 65 in this
 case.

 > Accuracy of arl65f and arl65m:

 These statistics are calculated for the birth cohort being
 tracked in the embedded microsimulation model by recording at
 each age the total population count for each gender.  These head
 counts are used to compute an average remaining life at age 65
 statistic for each gender.  But if there is non-zero net
 immigration at ages beyond 65, then this calculation method is
 not strictly correct.  In fact the benchmark assumptions
 typically used in model runs do assume (per SSA OCACT) a small
 volume of net in migration of elderly people.  This small amount
 of positive net immigration causes the computed statistics to be
 about two months too large (i.e., somewhere around 0.17 too high).

 Life expectancy at age 65 (female/male): (4-5)
 (assuming static or current-year mortality rates)
 [this is what Trustees' Report calls "period" life expectancy]
 [this is NOT what Trustees' Report calls "cohort" life expectancy]
 " le65f", " le65m",
 Life expectancy at birth (female/male): (6-7)
 (assuming static or current-year mortality rates)
 [this is what Trustees' Report calls "period" life expectancy]
 [this is NOT what Trustees' Report calls "cohort" life expectancy]
 " le00f", " le00m",
 Low-benefit thresholds for cohort individuals and couples: (8-9)
 (expressed in COHORT.cpi_year dollars at age 62)
 "lobnti", "lobntc",
 Birth year of cohort individuals & couples [COHORT.birth_year] (10)
 "b_year"