Fig. 5. Histograms showing the distribution of total partners in the observation periods for women (white) and men (shaded) in the 5-year Norwegian survey. (Inset) Double-logarithmic plots of the cumulative average numbers of new partners in the 1-year study period for women (circles) and men (stars). It is plotted as a function of the number of partners in the foregoing period. Thus, the mean values are group averages among all individuals having exactly j partners in the initial part of the observation period.

Fig. 6. The cumulative probability of new partners, , as function of the new partners in the 1-year study period. The probabilities are calculated with the model parameter (Table 1) by conditioning on the initial numbers of partners in the study populations. (A) Women during the 5-year observation period. (B) Men during the 5-year observation period.

Fig. 7. The cumulative probability of new partners, , as function of the new partners, , in the 1-year study period. The probabilities are calculated by using the model parameter in Table 2. The individuals are partitioned by their age or civil status, and the expected numbers of new partners in each strata is calculated separately based on the initial numbers of partners , then these numbers are summed to provide the pmf of the entire population. (A) Women during the 5-year observation period. (B) Men during the 5-year observation period.