Model Assumptions, Detail using ALTA 7 PRO
The lognormal distribution combined with a general log-linear relationship was used in this analysis, as shown next:

The data at each age, along with the value of each characteristic, were simultaneously fitted to the above model using ALTA 7 PRO, where t is the characteristic value and vector X holds the age for each value.
The data as entered in ALTA 7 PRO, along with the model settings, are shown next:
