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# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See LICENSE.txt in the project root for license information.
# --------------------------------------------------------------------------------------------
#' @title Tenure calculation based on different input dates, returns data
#' summary table or histogram
#'
#' @description
#' This function calculates employee tenure based on different input dates.
#' `identify_tenure` uses the latest Date available if user selects "Date",
#' but also have flexibility to select a specific date, e.g. "1/1/2020".
#'
#' @family Data Validation
#'
#' @param data A Standard Person Query dataset in the form of a data frame.
#' @param end_date A string specifying the name of the date variable
#' representing the latest date. Defaults to "Date".
#' @param beg_date A string specifying the name of the date variable
#' representing the hire date. Defaults to "HireDate".
#' @param maxten A numeric value representing the maximum tenure.
#' If the tenure exceeds this threshold, it would be accounted for in the flag message.
#'
#' @param return String specifying what to return. This must be one of the
#' following strings:
#' - `"message"`
#' - `"text"`
#' - `"plot"`
#' - `"data_cleaned"`
#' - `"data_dirty"`
#' - `"data"`
#'
#' See `Value` for more information.
#' @return
#' A different output is returned depending on the value passed to the `return`
#' argument:
#' - `"message"`: message on console with a diagnostic message.
#' - `"text"`: string containing a diagnostic message.
#' - `"plot"`: 'ggplot' object. A line plot showing tenure.
#' - `"data_cleaned"`: data frame filtered only by rows with tenure values
#' lying within the threshold.
#' - `"data_dirty"`: data frame filtered only by rows with tenure values
#' lying outside the threshold.
#' - `"data"`: data frame with the `PersonId` and a calculated variable called
#' `TenureYear` is returned.
#'
#'
#' @examples
#' library(dplyr)
#' # Add HireDate to sq_data
#' sq_data2 <-
#' sq_data %>%
#' mutate(HireDate = as.Date("1/1/2015", format = "%m/%d/%Y"))
#'
#' identify_tenure(sq_data2)
#'
#' @export
identify_tenure <- function(data,
end_date = "Date",
beg_date = "HireDate",
maxten = 40,
return = "message"){
required_variables <- c("HireDate")
## Error message if variables are not present
## Nothing happens if all present
data %>%
check_inputs(requirements = required_variables)
data_prep <-
data %>%
mutate(Date = as.Date(Date, format= "%m/%d/%Y"), # Re-format `Date`
end_date = as.Date(!!sym(end_date), format= "%m/%d/%Y"), # Access a symbol, not a string
beg_date = as.Date(!!sym(beg_date), format= "%m/%d/%Y")) %>% # Access a symbol, not a string
arrange(end_date) %>%
mutate(End = last(end_date))
last_date <- data_prep$End
# graphing data
tenure_summary <-
data_prep %>%
filter(Date == last_date) %>%
mutate(tenure_years = (Date - beg_date)/365) %>%
group_by(tenure_years)%>%
summarise(n = n(),.groups = 'drop')
# off person IDs
oddpeople <-
data_prep %>%
filter(Date == last_date) %>%
mutate(tenure_years = (Date - beg_date)/365) %>%
filter(tenure_years >= maxten) %>%
select(PersonId)
# message
Message <- paste0("The mean tenure is ",round(mean(tenure_summary$tenure_years,na.rm = TRUE),1)," years.\nThe max tenure is ",
round(max(tenure_summary$tenure_years,na.rm = TRUE),1),".\nThere are ",
length(tenure_summary$tenure_years[tenure_summary$tenure_years>=maxten])," employees with a tenure greater than ",maxten," years.")
if(return == "text"){
return(Message)
} else if(return == "message"){
message(Message)
} else if(return == "plot"){
suppressWarnings(
ggplot(data = tenure_summary,aes(x = as.numeric(tenure_years))) +
geom_density() +
labs(title = "Tenure - Density",
subtitle = "Calculated with `HireDate`") +
xlab("Tenure in Years") +
ylab("Density - number of employees") +
theme_wpa_basic()
)
} else if(return == "data_cleaned"){
return(data %>% filter(!(PersonId %in% oddpeople$PersonId)) %>% data.frame())
} else if(return == "data_dirty"){
return(data %>% filter((PersonId %in% oddpeople$PersonId)) %>% data.frame())
} else if(return == "data"){
data_prep %>%
filter(Date == last_date) %>%
mutate(TenureYear = as.numeric((Date - beg_date)/365)) %>%
select(PersonId, TenureYear)
} else {
stop("Error: please check inputs for `return`")
}
}
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