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AMR/R/key_antimicrobials.R

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# ==================================================================== #
# TITLE #
# AMR: An R Package for Working with Antimicrobial Resistance Data #
# #
# SOURCE #
# https://github.com/msberends/AMR #
# #
# CITE AS #
# Berends MS, Luz CF, Friedrich AW, Sinha BNM, Albers CJ, Glasner C #
# (2022). AMR: An R Package for Working with Antimicrobial Resistance #
# Data. Journal of Statistical Software, 104(3), 1-31. #
# doi:10.18637/jss.v104.i03 #
# #
# Developed at the University of Groningen and the University Medical #
# Center Groningen in The Netherlands, in collaboration with many #
# colleagues from around the world, see our website. #
# #
# This R package is free software; you can freely use and distribute #
# it for both personal and commercial purposes under the terms of the #
# GNU General Public License version 2.0 (GNU GPL-2), as published by #
# the Free Software Foundation. #
# We created this package for both routine data analysis and academic #
# research and it was publicly released in the hope that it will be #
# useful, but it comes WITHOUT ANY WARRANTY OR LIABILITY. #
# #
# Visit our website for the full manual and a complete tutorial about #
# how to conduct AMR data analysis: https://msberends.github.io/AMR/ #
# ==================================================================== #
#' (Key) Antimicrobials for First Weighted Isolates
#'
#' These functions can be used to determine first weighted isolates by considering the phenotype for isolate selection (see [first_isolate()]). Using a phenotype-based method to determine first isolates is more reliable than methods that disregard phenotypes.
#' @param x a [data.frame] with antibiotics columns, like `AMX` or `amox`. Can be left blank to determine automatically
#' @param y,z [character] vectors to compare
#' @inheritParams first_isolate
#' @param universal names of **broad-spectrum** antimicrobial drugs, case-insensitive. Set to `NULL` to ignore. See *Details* for the default antimicrobial drugs
#' @param gram_negative names of antibiotic drugs for **Gram-positives**, case-insensitive. Set to `NULL` to ignore. See *Details* for the default antibiotic drugs
#' @param gram_positive names of antibiotic drugs for **Gram-negatives**, case-insensitive. Set to `NULL` to ignore. See *Details* for the default antibiotic drugs
#' @param antifungal names of antifungal drugs for **fungi**, case-insensitive. Set to `NULL` to ignore. See *Details* for the default antifungal drugs
#' @param only_sir_columns a [logical] to indicate whether only columns must be included that were transformed to class `sir` (see [as.sir()]) on beforehand (default is `FALSE`)
#' @param ... ignored, only in place to allow future extensions
#' @details
#' The [key_antimicrobials()] and [all_antimicrobials()] functions are context-aware. This means that the `x` argument can be left blank if used inside a [data.frame] call, see *Examples*.
#'
#' The function [key_antimicrobials()] returns a [character] vector with 12 antimicrobial results for every isolate. The function [all_antimicrobials()] returns a [character] vector with all antimicrobial drug results for every isolate. These vectors can then be compared using [antimicrobials_equal()], to check if two isolates have generally the same antibiogram. Missing and invalid values are replaced with a dot (`"."`) by [key_antimicrobials()] and ignored by [antimicrobials_equal()].
#'
#' Please see the [first_isolate()] function how these important functions enable the 'phenotype-based' method for determination of first isolates.
#'
#' The default antimicrobial drugs used for **all rows** (set in `universal`) are:
#'
#' - Ampicillin
#' - Amoxicillin/clavulanic acid
#' - Cefuroxime
#' - Ciprofloxacin
#' - Piperacillin/tazobactam
#' - Trimethoprim/sulfamethoxazole
#'
#' The default antimicrobial drugs used for **Gram-negative bacteria** (set in `gram_negative`) are:
#'
#' - Cefotaxime
#' - Ceftazidime
#' - Colistin
#' - Gentamicin
#' - Meropenem
#' - Tobramycin
#'
#' The default antimicrobial drugs used for **Gram-positive bacteria** (set in `gram_positive`) are:
#'
#' - Erythromycin
#' - Oxacillin
#' - Rifampin
#' - Teicoplanin
#' - Tetracycline
#' - Vancomycin
#'
#'
#' The default antimicrobial drugs used for **fungi** (set in `antifungal`) are:
#'
#' - Anidulafungin
#' - Caspofungin
#' - Fluconazole
#' - Miconazole
#' - Nystatin
#' - Voriconazole
#' @rdname key_antimicrobials
#' @export
#' @seealso [first_isolate()]
#' @examples
#' # `example_isolates` is a data set available in the AMR package.
#' # See ?example_isolates.
#'
#' # output of the `key_antimicrobials()` function could be like this:
#' strainA <- "SSSRR.S.R..S"
#' strainB <- "SSSIRSSSRSSS"
#'
#' # those strings can be compared with:
#' antimicrobials_equal(strainA, strainB, type = "keyantimicrobials")
#' # TRUE, because I is ignored (as well as missing values)
#'
#' antimicrobials_equal(strainA, strainB, type = "keyantimicrobials", ignore_I = FALSE)
#' # FALSE, because I is not ignored and so the 4th [character] differs
#'
#' \donttest{
#' if (require("dplyr")) {
#' # set key antibiotics to a new variable
#' my_patients <- example_isolates %>%
#' mutate(keyab = key_antimicrobials(antifungal = NULL)) %>% # no need to define `x`
#' mutate(
#' # now calculate first isolates
#' first_regular = first_isolate(col_keyantimicrobials = FALSE),
#' # and first WEIGHTED isolates
#' first_weighted = first_isolate(col_keyantimicrobials = "keyab")
#' )
#'
#' # Check the difference in this data set, 'weighted' results in more isolates:
#' sum(my_patients$first_regular, na.rm = TRUE)
#' sum(my_patients$first_weighted, na.rm = TRUE)
#' }
#' }
key_antimicrobials <- function(x = NULL,
col_mo = NULL,
universal = c(
"ampicillin", "amoxicillin/clavulanic acid", "cefuroxime",
"piperacillin/tazobactam", "ciprofloxacin", "trimethoprim/sulfamethoxazole"
),
gram_negative = c(
"gentamicin", "tobramycin", "colistin",
"cefotaxime", "ceftazidime", "meropenem"
),
gram_positive = c(
"vancomycin", "teicoplanin", "tetracycline",
"erythromycin", "oxacillin", "rifampin"
),
antifungal = c(
"anidulafungin", "caspofungin", "fluconazole",
"miconazole", "nystatin", "voriconazole"
),
only_sir_columns = FALSE,
...) {
if (is_null_or_grouped_tbl(x)) {
# when `x` is left blank, auto determine it (get_current_data() searches underlying data within call)
# is also fix for using a grouped df as input (a dot as first argument)
x <- tryCatch(get_current_data(arg_name = "x", call = -2), error = function(e) x)
}
meet_criteria(x, allow_class = "data.frame") # also checks dimensions to be >0
meet_criteria(col_mo, allow_class = "character", has_length = 1, allow_NULL = TRUE, allow_NA = TRUE, is_in = colnames(x))
meet_criteria(universal, allow_class = "character", allow_NULL = TRUE)
meet_criteria(gram_negative, allow_class = "character", allow_NULL = TRUE)
meet_criteria(gram_positive, allow_class = "character", allow_NULL = TRUE)
meet_criteria(antifungal, allow_class = "character", allow_NULL = TRUE)
meet_criteria(only_sir_columns, allow_class = "logical", has_length = 1)
# force regular data.frame, not a tibble or data.table
x <- as.data.frame(x, stringsAsFactors = FALSE)
cols <- get_column_abx(x, info = FALSE, only_sir_columns = only_sir_columns, fn = "key_antimicrobials")
# try to find columns based on type
# -- mo
if (is.null(col_mo)) {
col_mo <- search_type_in_df(x = x, type = "mo", info = FALSE)
}
if (is.null(col_mo)) {
warning_("in `key_antimicrobials()`: no column found for `col_mo`, ignoring antibiotics set in `gram_negative` and `gram_positive`, and antimycotics set in `antifungal`")
gramstain <- NA_character_
kingdom <- NA_character_
} else {
x.mo <- as.mo(x[, col_mo, drop = TRUE])
gramstain <- mo_gramstain(x.mo, language = NULL)
kingdom <- mo_kingdom(x.mo, language = NULL)
}
AMR_string <- function(x, values, name, filter, cols = cols) {
if (is.null(values)) {
return(rep(NA_character_, length(which(filter))))
}
values_old_length <- length(values)
values <- as.ab(values, flag_multiple_results = FALSE, info = FALSE)
values <- cols[names(cols) %in% values]
values_new_length <- length(values)
if (values_new_length < values_old_length &&
any(filter, na.rm = TRUE) &&
message_not_thrown_before("key_antimicrobials", name)) {
warning_(
"in `key_antimicrobials()`: ",
ifelse(values_new_length == 0,
"No columns available ",
paste0("Only using ", values_new_length, " out of ", values_old_length, " defined columns ")
),
"as key antimicrobials for ", name, "s. See ?key_antimicrobials."
)
}
generate_antimcrobials_string(x[which(filter), c(universal, values), drop = FALSE])
}
if (is.null(universal)) {
universal <- character(0)
} else {
universal <- as.ab(universal, flag_multiple_results = FALSE, info = FALSE)
universal <- cols[names(cols) %in% universal]
}
key_ab <- rep(NA_character_, nrow(x))
key_ab[which(gramstain == "Gram-negative")] <- AMR_string(
x = x,
values = gram_negative,
name = "Gram-negative",
filter = gramstain == "Gram-negative",
cols = cols
)
key_ab[which(gramstain == "Gram-positive")] <- AMR_string(
x = x,
values = gram_positive,
name = "Gram-positive",
filter = gramstain == "Gram-positive",
cols = cols
)
key_ab[which(kingdom == "Fungi")] <- AMR_string(
x = x,
values = antifungal,
name = "antifungal",
filter = kingdom == "Fungi",
cols = cols
)
# back-up - only use `universal`
key_ab[which(is.na(key_ab))] <- AMR_string(
x = x,
values = character(0),
name = "",
filter = is.na(key_ab),
cols = cols
)
if (length(unique(key_ab)) == 1) {
warning_("in `key_antimicrobials()`: no distinct key antibiotics determined.")
}
key_ab
}
#' @rdname key_antimicrobials
#' @export
all_antimicrobials <- function(x = NULL,
only_sir_columns = FALSE,
...) {
if (is_null_or_grouped_tbl(x)) {
# when `x` is left blank, auto determine it (get_current_data() searches underlying data within call)
# is also fix for using a grouped df as input (a dot as first argument)
x <- tryCatch(get_current_data(arg_name = "x", call = -2), error = function(e) x)
}
meet_criteria(x, allow_class = "data.frame") # also checks dimensions to be >0
meet_criteria(only_sir_columns, allow_class = "logical", has_length = 1)
# force regular data.frame, not a tibble or data.table
x <- as.data.frame(x, stringsAsFactors = FALSE)
cols <- get_column_abx(x,
only_sir_columns = only_sir_columns, info = FALSE,
sort = FALSE, fn = "all_antimicrobials"
)
generate_antimcrobials_string(x[, cols, drop = FALSE])
}
generate_antimcrobials_string <- function(df) {
if (NCOL(df) == 0) {
return(rep("", NROW(df)))
}
if (NROW(df) == 0) {
return(character(0))
}
tryCatch(
{
do.call(
paste0,
lapply(
as.list(df),
function(x) {
x <- toupper(as.character(x))
x[!x %in% c("S", "I", "R")] <- "."
paste(x)
}
)
)
},
error = function(e) rep(strrep(".", NCOL(df)), NROW(df))
)
}
#' @rdname key_antimicrobials
#' @export
antimicrobials_equal <- function(y,
z,
type = c("points", "keyantimicrobials"),
ignore_I = TRUE,
points_threshold = 2,
...) {
meet_criteria(y, allow_class = "character")
meet_criteria(z, allow_class = "character")
stop_if(missing(type), "argument \"type\" is missing, with no default")
meet_criteria(type, allow_class = "character", has_length = 1, is_in = c("points", "keyantimicrobials"))
meet_criteria(ignore_I, allow_class = "logical", has_length = 1)
meet_criteria(points_threshold, allow_class = c("numeric", "integer"), has_length = 1, is_positive = TRUE, is_finite = TRUE)
stop_ifnot(length(y) == length(z), "length of `y` and `z` must be equal")
key2sir <- function(val) {
val <- strsplit(val, "", fixed = TRUE)[[1L]]
val.int <- rep(NA_real_, length(val))
val.int[val == "S"] <- 1
val.int[val == "I"] <- 2
val.int[val == "R"] <- 3
val.int
}
# only run on uniques
uniq <- unique(c(y, z))
uniq_list <- lapply(uniq, key2sir)
names(uniq_list) <- uniq
y <- uniq_list[match(y, names(uniq_list))]
z <- uniq_list[match(z, names(uniq_list))]
determine_equality <- function(a, b, type, points_threshold, ignore_I) {
if (length(a) != length(b)) {
# incomparable, so not equal
return(FALSE)
}
# ignore NAs on both sides
NA_ind <- which(is.na(a) | is.na(b))
a[NA_ind] <- NA_real_
b[NA_ind] <- NA_real_
if (type == "points") {
# count points for every single character:
# - no change is 0 points
# - I <-> S|R is 0.5 point
# - S|R <-> R|S is 1 point
# use the levels of as.sir (S = 1, I = 2, R = 3)
# and divide by 2 (S = 0.5, I = 1, R = 1.5)
(sum(abs(a - b), na.rm = TRUE) / 2) < points_threshold
} else {
if (ignore_I == TRUE) {
ind <- which(a == 2 | b == 2) # since as.double(as.sir("I")) == 2
a[ind] <- NA_real_
b[ind] <- NA_real_
}
all(a == b, na.rm = TRUE)
}
}
out <- unlist(Map(
f = determine_equality,
y,
z,
MoreArgs = list(
type = type,
points_threshold = points_threshold,
ignore_I = ignore_I
),
USE.NAMES = FALSE
))
out[is.na(y) | is.na(z)] <- NA
out
}
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