Linear model with random effects: fitting


Birthweight model including covariates at municipality level with linear effects.

Load packages, read data and source custom scripts

Paths are defined relative to the git repository location.

rm(list = ls())
library(bamlss)
#> Loading required package: coda
#> Loading required package: colorspace
#> Loading required package: mgcv
#> Loading required package: nlme
#> This is mgcv 1.8-31. For overview type 'help("mgcv-package")'.
#> 
#> Attaching package: 'bamlss'
#> The following object is masked from 'package:mgcv':
#> 
#>     smooth.construct
library(gamlss.dist)
#> Loading required package: MASS
path_proj <- day2day::git_path()
path_data <- file.path(path_proj, "data")
path_processed <- file.path(path_data, "processed")
path_modelled <- file.path(path_data, "modelled")

path_modelled_data <- file.path(path_modelled, "bw-muni-08-lm-re.rds")
path_modelled_sink <- gsub("\\.rds$", "\\.txt", path_modelled_data)
path_modelled_form <- gsub("(\\.rds)$", "-form\\1", path_modelled_data)

bwdata_model <- fst::read_fst(file.path(path_processed, "bwdata_41_model.fst"))

Define formula for our model

Now we define the same models as in the previous study.

form_sigma <- sigma ~ 1

form_mu <- born_weight ~ remoteness + prop_tap_toilet + s(res_muni, bs = "re")

form <- list(form_mu, form_sigma)

Run the model of interest and save results

{
    sink(path_modelled_sink)
    bamlss_model <- bamlss(
        form, data = bwdata_model,
        n.iter = 1000, burnin = 0, cores = 4, combine = FALSE, light = TRUE
    )
    sink()
}
readLines(path_modelled_sink)
#>   [1] "AICc 4465334. logPost -2454954 logLik -2232662 edf 5.0881 eps 0.0321 iteration   1"                                                     
#>   [2] "AICc 4458447. logPost -2231450 logLik -2229211 edf 12.679 eps 0.0074 iteration   2"                                                     
#>   [3] "AICc 4456610. logPost -2228818 logLik -2228272 edf 33.194 eps 0.0038 iteration   3"                                                     
#>   [4] "AICc 4456383. logPost -2228414 logLik -2228146 edf 44.877 eps 0.0015 iteration   4"                                                     
#>   [5] "AICc 4456381. logPost -2228395 logLik -2228144 edf 46.357 eps 0.0001 iteration   5"                                                     
#>   [6] "AICc 4456381. logPost -2228395 logLik -2228144 edf 46.352 eps 0.0000 iteration   6"                                                     
#>   [7] "AICc 4456381. logPost -2228395 logLik -2228144 edf 46.352 eps 0.0000 iteration   6"                                                     
#>   [8] "elapsed time:  9.68sec"                                                                                                                 
#>   [9] "Starting the sampler..."                                                                                                                
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system.time(saveRDS(bamlss_model, file = path_modelled_data))
#>    user  system elapsed 
#>   2.312   0.004   2.317
saveRDS(form, file = path_modelled_form)

Time to execute the task

Only useful when executed with Rscript.

proc.time()
#>     user   system  elapsed 
#> 2987.760    8.275  767.654