R Under development (unstable) (2024-04-23 r86473 ucrt) -- "Unsuffered Consequences"
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> library(epigrowthfit)
> options(warn = 2L, error = if (interactive()) recover)
> 
> o.1 <- egf_cache("egf-1.rds")
> 
> 
> ## print ###############################################################
> 
> vv <- withVisible(print(o.1))
Top level nonlinear model ..............................................

  X(s, t) ~ dpois(lambda = f(t) - f(s))
  where
  f(t) = c0 * exp(r * t)

  $ curve      :"exponential"
  $ excess     :FALSE
  $ family     :"pois"
  $ day_of_week:0

Bottom level mixed effects model .......................................

   log(r) ~ 1 | country:wave
  log(c0) ~ 1 | country:wave

Data ...................................................................

  300 observations   
   20 fitting windows
   10 time series    
> stopifnot(exprs = {
+ 	identical(vv[["value"]], o.1)
+ 	identical(vv[["visible"]], FALSE)
+ })
> 
> proc.time()
   user  system elapsed 
   1.35    0.14    1.48