BRMS running time
KK
Dear all,
I am trying to predict the sales of different SKU by using a log-log model.
However, I should also capture the heterogeneity among the different brands (I would like to have a different price elasticity coefficient for each
different brand). When I run the model without random effect term it takes less
than 10 minutes. After including the random effect term it takes more than 8-9
hours to finish. The problem is that I have to include more (random effect)
terms so I cannot imagine how worse it will be. Am I doing something wrong?
Here is the formula I used:
brm(formula
= log(npack) ~ (log1p(sales_price_pack)|brand) + log1p(wd) +
log1p(wd_disp),cores=parallel::detectCores() , chains = 2, warmup = 500,
data = temp)
Should I try to define a more restrictive prior for the price since we know
that the coefficient has to be negative?
Paul Buerkner
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