speed? [🇷 for BE/BA]

posted by Helmut Homepage – Vienna, Austria, 2020-04-30 12:38 (793 d 03:04 ago) – Posting: # 21370
Views: 17,143

Hi Yung-jin,

» R v4.0.0 seems running faster on Windows …

Really? I removed 3.6.3 yesterday. If you still have it, can you do me a favor and perform a demanding check (sample size by 105 subject simulations for a partial replicate design with heterogenicity, the EMA’s approach of reference-scaling, assumed T/R-ratio 0.9, target power 0.8, five runs):

library(PowerTOST)
if (packageVersion("PowerTOST") < "1.4.8") {
  stop("Please install the latest version from CRAN.")
} else {
  CVp <- 0.4                                      # pooled CVw
  CV  <- signif(CVp2CV(CV = CVp, ratio = 2.5), 4) # CVwT > CVwR
  t   <- numeric(5)
  for (j in seq_along(t)) {
    t[j] <- system.time(sampleN.scABEL.sdsims(CV = CV, design = "2x3x3",
                                              progress = FALSE, details = FALSE,
                                              print = FALSE)[["Sample size"]])[3]   }
  cat(sprintf("%.2f seconds", median(t)), "\n")
}


BTW, I love that in 4.0.0 the default of stringsAsFactors was changed to FALSE.
Something I regularly forgot in imports or assigning data.frames;-)

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