One can visualize the similarities and differences between the age trends indicated by the different models by inspecting the plotted trend lines in Figure 3. Whereas the linear models predict a relatively constant level of genetic and environmental effects following age 15, the exponential model displays steady change until later in the lifespan. However, the different models are highly similar, overlap for much of the lifespan, and each visually reflect the weighted data accurately. In comparing the different AIC and BIC preferred models, it is apparent that they nearly completely overlap. The major difference concerns the age-trend for very young children, but beyond this discrepancy, the models indicate the same developmental trajectory. Again, very little difference is observed between the connected-linear trend and the continuous exponential trend apart from slight deviations in adolescence. This result may indicate that the connected-linear models may have an advantage over the exponential models as the scatterplot does seem to indicate more rapid change during this time period. On the whole, however, similar developmental implications can be derived from both analytical strategies. Heritability tends to
