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<addhtml> Given any two quantities the program will estimate the rest:

Number of Volunteers in the past year...
&nbsp&nbsp&nbsp&nbsp&nbsp Entered Service
&nbsp&nbsp&nbsp&nbsp&nbsp Finished Service (COS)
&nbsp&nbsp&nbsp&nbsp&nbsp Early Terminated (ET)
&nbsp&nbsp&nbsp&nbsp&nbsp Currently Serving
&nbsp&nbsp&nbsp&nbsp&nbsp TOTAL served any part of year
Rate of Early Termination: (as decimal)
&nbsp&nbsp&nbsp&nbsp&nbsp Cohort Method ("Out of 100")
&nbsp&nbsp&nbsp&nbsp&nbsp Annual Method
&nbsp&nbsp&nbsp&nbsp&nbsp Volunteer-Year Method
&nbsp&nbsp&nbsp&nbsp&nbsp Average length of service (months)

a: Annual ET rate (current method used by Peace Corps) The number of PCVs/Ts who separated from the Peace Corps during the fiscal year divided by the total number of trainees and volunteers who served at any time during the fiscal year. (Ref.) [FY2009 Actual Value: 10.0% (Ref.)]
c: The average number of currently serving volunteers and trainees at any moment in time. [FY2009 Estimated Value: 7,596]
e: The number of volunteers and trainees that Early Terminated within the year under study. [FY2009 Actual value: 1,155 (Ref.)]
n: The number of volunteers and trainees that served any portion of the year under study [FY2009 Actual Value: 11,549 (Ref.)]
p: Cohort ET rate ("Out of 100") This method addresses the question: "If X number of people enter Peace Corps service during a given time period, how many do not complete their service?" Equivalent to the probability of a randomly selected volunteer Early Terminating sometime within their service. [FY2009 Estimated Value: 29.2% (Ref.)]
r: Number of volunteers who entered service in the year under study [FY2009 Estimated Value: 3,953]
v: V-Year Method of ET Rate. The number of ET's by an average volunteer during one year of service. Since most volunteers successfully complete their service, which is longer than one year, this number would be a "fraction of an ET". If the V-Year ET Rate was 0.20 (per year) we would expect about 2 volunteers out of 10 to ET per year, or about 1 volunteer out of 10 in a six-month period. (Ref.) [FY2009 Estimated Value: 0.152]
L: Average length of service among all volunteers (in months) [FY2009 Estimated Value: 22.1 months]

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