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| | IIA: Stochastic Model of OASDI program |
 | | Equations were selected for a set of assumption variables that include the total fertility rate, changes in mortality, levels of immigration, emigration, and net other immigration, unemployment rate, inflation rate, real interest rate, growth rate in the real average wage, and disability incidence and recovery rates. |
 | | total fertility rate is the sum of age-specific birth rates2 for women aged 14 through 49. |
 | | Thus, the total fertility rate for a given year may be interpreted as the average number of children that would be born to a woman throughout her lifetime if she were to survive the entire childbearing period and experience the observed age-specific birth rate each year of her life. |
| www.ssa.gov /OACT/NOTES/as117/LR_Stochastic_IIA.html (320 words) |
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