A cohort was a sub-division of the Roman infantry, originally of a Roman legion, consisting of 480 men, itself divided in 6 centurias commanded each by a centurion. In the Imperial Roman auxiliary forces, there were individual cohorts of 500 (quingenaria), and 1000 (miliaria), as well as mixed infantry and cavalry units (cohors equitata) that existed in parallel.
For the meaning in statistics, see cohort (statistics).
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The baseline cohorts used in the projections are single-year-of-age cohorts for males and females of Anglo, Black, Hispanic and Other racial/ethnic groups extracted from Summary Tape File 2 from the 1990 Census of Population and Housing.
Special populations are, therefore, generally removed from the cohort base, the base cohorts projected forward and a separate projection of the special population for the projection date is added to the projected base cohorts to obtain the projection of the total population.
For counties with special populations of sufficient size, the baseline cohorts without special populations are projected forward and projections of special populations for the projection years are added to the projections for the baseline cohorts to obtain projections of the total population.
Other participants who criticized the cohort also pulled back from outright opposition to the cohort model, but instead described their reason for favoring the status quo as "personal laziness": it took effort to meet new peers, and they felt busy enough as it was.
Under the plan, the cohort sections in the second year would each contain half of the "familiar" students from the first yearÂ’s cohort, and half of the new or unfamiliar students from the other cohort section of the stream.
It is unclear, however, whether the cohort model therefore actually impeded the education of students like Nancy, or merely amounted to a sort of diverting "side show" while they focused on their real interest, gaining teacher certification.
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