Intervals considering $analyte column

[Gero1999]

Hello, I was just wondering if once PKNCAdata() creates the $intervals dataframe would not be good that these are already also segregated by $analyte. I can imagine that sometimes certain customizations such as the $impute rule can be interesting to be done differently depending on the analyte (main drug, metabolite, conjugates...).

[billdenney]

I'm not sure that I understand the question. You can make intervals separate by analyte by including a column for your analyte in the intervals data.frame, if desired. Then, you can set the imputation on a per-analyte basis. Is that what you're asking about?

For example, if you have your analyte in a PCTEST column, you can setup your intervals as described in the imputation vignette.

d_intervals <-
  data.frame(
    PCTEST = c("main drug", "metabolite"),
    start = 0, end = 24,
    cmax = TRUE,
    impute = c("start_predose", "start_conc0")
  )
d_intervals
#>       PCTEST start end cmax        impute
#> 1  main drug     0  24 TRUE start_predose
#> 2 metabolite     0  24 TRUE   start_conc0

^{Created on 2025-01-23 with reprex v2.1.1}

[Gero1999]

@billdenney you are right this can entirely be done by the user already, thanks! 😅

I am only thinking that maybe this could also be done by default when in PKNCAdata() the intervals argument is not specified but there is a PKNCAdata$conc$columns$groups$analyte defined column.

[billdenney]

What standard would you propose, and how would PKNCA detect what to do automatically?

My guess is that this may be a good fit within #157. (The number of times recently that issue has come up is definitely making it a higher priority.)

[Gero1999]

After re-checking today i realize the default behavior I was mentioning is indeed already 100% covered, sorry for the misleading, yesterday was a long day 😅

I will close the discussion!

[billdenney]

No worries at all. If there is any confusion, it is a good thing to ask because you're jumping into PKNCA in a different way than most people. You'll likely find confusing parts.

I'm glad that it became clearer.