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#' Count Expected Observations
#'
#' Count participants, if an observation was expected, given the
#' `PART_VARS` from item-level metadata
#'
#' @param resp_vars [character] the response variables, for that a value may be
#' expected
#' @param study_data [study_data]
#' @param meta_data [meta_data]
#' @param label_col [character] mapping attribute `colnames(study_data)` vs.
#' `meta_data[label_col]`
#' @param expected_observations [enum] HIERARCHY | ALL | SEGMENT. How should
#' `PART_VARS` be handled:
#' - `ALL`: Ignore, all observations are
#' expected
#' - `SEGMENT`: if `PART_VAR` is 1, an
#' observation is expected
#' - `HIERARCHY`: the default, if the
#' `PART_VAR` is 1 for this variable and
#' also for all `PART_VARS` of `PART_VARS`
#' up in the hierarchy, an observation is
#' expected.
#'
#' @return a vector with the number of expected observations for each
#' `resp_vars`.
util_count_expected_observations <- function(resp_vars, study_data, meta_data,
label_col = LABEL,
expected_observations =
c("HIERARCHY",
"ALL",
"SEGMENT")) {
vapply(resp_vars, function(rv) {
sum(util_observation_expected(rv = rv,
study_data = study_data,
meta_data = meta_data,
label_col = label_col,
expected_observations =
expected_observations),
na.rm = TRUE)
},
FUN.VALUE = integer(1))
}
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