Internal: Reshape into Long Format
reshape_into_long(
preds_intvar,
pred_data,
int_var,
int_params,
samples,
coltype
)
A data.frame with the moments as columns and the splitted
int_var
as rows (default 100 values from min to max). There are
three ways which this data.frame can look like. First, as the mean of the
moments. secondly, as the upper and thirdly as the lower quantiles of the
moments.