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bwiernik avatar bwiernik commented on May 26, 2024

Bootstrap sampling with complex survey weights is much more involved than with simple random sampling. I do not believe that we currently have any bootstrapping implemented for any complex survey designs. https://arxiv.org/pdf/1902.08944v1.pdf

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strengejacke avatar strengejacke commented on May 26, 2024

We cannot simply sample from the data, we would also re-create the survey design for each bootstrap-sample, right? I think, unless we find a good solution, we should for now give an informative message that bootstrapping is not possible for models with survey design.

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brianmsm avatar brianmsm commented on May 26, 2024

Yes, the replications or resamples would have to come out of the previously created survey design object.

Procedurally I saw it this way, although I am not sure if it was correct.

# Load necessary libraries
library(survey)
#> Loading required package: grid
#> Loading required package: Matrix
#> Loading required package: survival
#> 
#> Attaching package: 'survey'
#> The following object is masked from 'package:graphics':
#> 
#>     dotchart
library(boot)
#> 
#> Attaching package: 'boot'
#> The following object is masked from 'package:survival':
#> 
#>     aml

# Use the mtcars dataset
data("mtcars")

# Create a fictitious survey design (random sampling weights)
# In real survey data, weights would be based on survey methodology
mtcars$weights <- runif(nrow(mtcars))
design <- svydesign(ids = ~1, data = mtcars, weights = ~weights)

# Fit a model using svyglm
# Predicting mpg (miles per gallon) based on wt (weight of the car)
model_svy <- svyglm(mpg ~ wt, design = design)

# Define the bootstrapping function
# This function fits the model to a resampled dataset and returns the coefficients
boot_function <- function(data, indices) {
  # Create a resampled dataset
  resampled_data <- data[indices, ]
  
  # Create a new survey design for the resampled data
  resampled_design <- svydesign(ids = ~1, data = resampled_data, weights = ~weights)
  
  # Fit the model to the new survey design
  resampled_model <- svyglm(mpg ~ wt, design = resampled_design)
  
  # Return the coefficients
  coef(resampled_model)
}

# Perform the bootstrapping process
# R is the number of bootstrap replications
boot_results <- boot(data = mtcars, statistic = boot_function, R = 1000)

# View the results
print(boot_results)
#> 
#> ORDINARY NONPARAMETRIC BOOTSTRAP
#> 
#> 
#> Call:
#> boot(data = mtcars, statistic = boot_function, R = 1000)
#> 
#> 
#> Bootstrap Statistics :
#>      original      bias    std. error
#> t1* 37.848293  0.20758589   2.1499704
#> t2* -5.535675 -0.08357097   0.6595995

Created on 2023-11-20 with reprex v2.0.2

Session info
sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.3.0 (2023-04-21 ucrt)
#>  os       Windows 11 x64 (build 22621)
#>  system   x86_64, mingw32
#>  ui       RTerm
#>  language (EN)
#>  collate  Spanish_Peru.utf8
#>  ctype    Spanish_Peru.utf8
#>  tz       America/Lima
#>  date     2023-11-20
#>  pandoc   3.1.1 @ C:/Program Files/RStudio/resources/app/bin/quarto/bin/tools/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version  date (UTC) lib source
#>  boot        * 1.3-28.1 2022-11-22 [2] CRAN (R 4.3.0)
#>  cli           3.6.1    2023-03-23 [1] CRAN (R 4.3.0)
#>  DBI           1.1.3    2022-06-18 [1] CRAN (R 4.3.0)
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#>  fs            1.6.2    2023-04-25 [1] CRAN (R 4.3.0)
#>  glue          1.6.2    2022-02-24 [1] CRAN (R 4.3.0)
#>  htmltools     0.5.5    2023-03-23 [1] CRAN (R 4.3.0)
#>  knitr         1.43     2023-05-25 [1] CRAN (R 4.3.0)
#>  lattice       0.21-8   2023-04-05 [2] CRAN (R 4.3.0)
#>  lifecycle     1.0.3    2022-10-07 [1] CRAN (R 4.3.0)
#>  magrittr      2.0.3    2022-03-30 [1] CRAN (R 4.3.0)
#>  Matrix      * 1.5-4    2023-04-04 [2] CRAN (R 4.3.0)
#>  mitools       2.4      2019-04-26 [1] CRAN (R 4.3.0)
#>  purrr         1.0.1    2023-01-10 [1] CRAN (R 4.3.0)
#>  R.cache       0.16.0   2022-07-21 [1] CRAN (R 4.3.0)
#>  R.methodsS3   1.8.2    2022-06-13 [1] CRAN (R 4.3.0)
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#>  rlang         1.1.1    2023-04-28 [1] CRAN (R 4.3.0)
#>  rmarkdown     2.22     2023-06-01 [1] CRAN (R 4.3.0)
#>  rstudioapi    0.14     2022-08-22 [1] CRAN (R 4.3.0)
#>  sessioninfo   1.2.2    2021-12-06 [1] CRAN (R 4.3.0)
#>  styler        1.10.1   2023-06-05 [1] CRAN (R 4.3.0)
#>  survey      * 4.2-1    2023-05-03 [1] CRAN (R 4.3.0)
#>  survival    * 3.5-5    2023-03-12 [2] CRAN (R 4.3.0)
#>  vctrs         0.6.2    2023-04-19 [1] CRAN (R 4.3.0)
#>  withr         2.5.0    2022-03-03 [1] CRAN (R 4.3.0)
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#>  yaml          2.3.7    2023-01-23 [1] CRAN (R 4.3.0)
#> 
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#>  [2] C:/Program Files/R/R-4.3.0/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────

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bwiernik avatar bwiernik commented on May 26, 2024

Simply resampling cases like that won't meet regularity conditions that we need for bootstrap inference unfortunately.

This is the basic procedure for resampling the weights to use in the bootstrap from the paper I link above image

We could implement this or similar procedures, but I wonder if someone has already implemented these in another package?

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