RW what do you think of this guy??

[Ronnie]

What exactly don't you understand?

The cohort and per capita stuff.  But it's okay, really.

[Misha]

The cohort and per capita stuff.  But it's okay, really.

A cohort is a group of people who are start an endeavor together. A cohort of students starting together or a cohort of soldiers who enlisted at the same time.

Per capita is usually per person (or a set amount). The per capita GNP is the GNP per person. Usually, when trying to deal with social phenomena, you measure them according to a set amount. Birth per 1,000 or 100,000 for example or murders per 10,000.

[SANDRO43]

The cohort and per capita stuff.

Cohort (from Lat. cohors, cohortis):

Originally, the cohort was a sub-unit of a Roman legion, usually consisting of 480 legionaries including six centurions. The cohort itself was divided into six centuries of 80 men commanded each by a centurion. However, the first of ten cohorts had five double-sized centuries totaling 800 men.

Various terms described precise types of military cohorts:
In the Imperial Roman praetorian forces, there were individual cohorts with an establishment strength of 500 (cohors quingenaria) or of 1000 (cohors milliaria), as well as mixed infantry and cavalry units (cohors equitata) that existed in parallel.

Various terms describe precise types of auxiliary cohorts:
Cohors alaria: allied or auxiliary unit.
Cohors classica: auxiliary unit originally formed of sailors and marines.
Cohors equitata (LA): unit of auxiliary infantry with attached mounted squadrons.
Cohors peditata (LA): infantry (foot) unit.
Cohors speculatorum (LA): guard unit of Mark Antony composed of scouts.
Cohors torquata (LA): auxiliary unit granted a torc (military decoration).
Cohors tumultuaria (from tumultus, "chaos"): irregular auxiliary unit.

http://en.wikipedia.org/wiki/Cohort_(military_unit)

Per capita (pl., sing. pro capite): from Lat. caput (e.g. Roma caput mundi), 'per head', i.e. 'each' .