Journal of Population Sciences
Table 3 Years required for 50, 75 and 95% membership turnover in the 1980 U.S. Senate in the Growth and Senescence Phases of the population life cycle model including years observed as well as years predicted by the Exponential model using the inverse of the means as the exponential rate parameters
From: Congressional symmetry: years remaining mirror years served in the U.S. House and Senate
Turnover level | For growth phase (years) | For senescence phase (years) | ||
|---|---|---|---|---|
Observed | Model | Observed | Model | |
50% | 7.2 | 7.0 | 11.7 | 9.1 |
75% | 15.5 | 15.9 | 18.5 | 18.1 |
95% | 27.1 | 30.2 | 33.0 | 39.2 |
Mean | 10.2 | 10.2 | 13.1 | 13.1 |
Rate parameter | 0.098 | 0.098 | 0.076 | 0.076 |