R/dataextr.time.R

In nealhaddaway/predicter: A Tool to Estimates the Time Needed to Conduct a Systematic Review or Systematic Map

#' Time needed to extract full data from all included records
#'
#' This function calculates the time needed to extract full data
#' (i.e. study qualitative or quantitative findings) from all
#' relevant records in a systematic review, based on the inputs of
#' the number of records passing the critical appraisal stage
#' ('ca.number', see 'ca.number' function), the
#' number of studies from which full data can be extracted per day
#' ('dextraction.day'), and the percentage of all studies that are
#' double checked for consistency of full data extraction
#' ('dextraction.checked'). Where full dual screening of all
#' records is used, this will equal a percentage of 100 abstracts
#' being checked. Default values are provided based on the
#' empirical study of environmental systematic reviews by
#' Haddaway and Westgate (2018) https://doi.org/10.1111/cobi.13231.

dataextr.time <- function(ca.number=76.12213,dextraction.day=6.9,dextraction.checked=0){
  dextraction <- ca.number / dextraction.day * ( 1 + ( dextraction.checked / 100 ) )
  return(dextraction)
}