Inverse of est_to_loo
This works for any statistics which, when computed across N blocks, are equal
to the weighted mean of the statistics across the N blocks.
loo_to_est(arr, block_lengths = NULL)3d array with blocked estimates, with blocks in the 3rd dimension.
Optional block lengths. If NULL, will be parsed from 3rd dimnames in blocks
A 3d array with leave-one-out estimates for jackknife. Dimensions are equal to those of arr.