process_gamma_predictions

This function processes gamma prediction results to calculate the mean age
predictions, scale, and shape parameters efficiently.

Automate the modelling of age-structured population data
using survey data, grid population estimates and urban-rural extents.

Mohamed A. Yusuf

<dl><dt>gamma_prediction</dt>
<dd>A list containing `scale_pred` and `shape_pred`
matrices from the gamma prediction model.</dd></dl>

<dl>

<dt>gamma_prediction</dt>
<dd>A list containing `scale_pred` and `shape_pred`
matrices from the gamma prediction model.</dd>

</dl>