Craig McGowan
5 years ago
10 changed files with 170 additions and 7 deletions
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#' Retrieves influenza hospitalization statistics from the CDC |
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#' |
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#' Uses the data source from the |
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#' \href{https://gis.cdc.gov/GRASP/Fluview/FluHospRates.html}{CDC FluView} |
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#' and provides influenza hospitalization reporting data as a data frame. |
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#' |
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#' @param area one of "\code{flusurvnet}", "\code{eip}", "\code{ihsp}", or two |
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#' digit state abbreviation for an individual site. Exceptions are |
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#' New York - Albany ("\code{nya}") and New York - Rochester ("\code{nyr}") |
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#' @param age_group a vector of age groups to pull data for. Possible values are: |
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#' "\code{overall}", "\code{0-4y}", "\code{5-17y}, "\code{18-49y}, |
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#' "\code{50-64y}, "\code{65+y}". |
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#' @param years a vector of years to retrieve data for (i.e. \code{2014} for CDC |
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#' flu season 2014-2015). Default value is the current year and all |
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#' \code{years} values should be >= \code{2009} |
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#' @return A single \code{data.frame}. |
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#' @note There is often a noticeable delay when making the API request to the CDC. |
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#' This is not due to a large download size, but the time it takes for their |
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#' servers to crunch the data. Wrap the function call in \code{httr::with_verbose} |
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#' if you would like to see what's going on. |
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#' @export |
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#' @examples \dontrun{ |
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#' # All of FluSurv-NET, 50-64 years old, 2010/11-2014/15 flu seasons |
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#' flu <- get_hosp_data("flusurvnet", "50-64y", years=2010:2014) |
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#' } |
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get_hosp_data <- function(area="flusurvnet", age_group="overall", |
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years=as.numeric(format(Sys.Date(), "%Y")) - 1) { |
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area <- tolower(area) |
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age_group <- tolower(age_group) |
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if (!(area %in% c("flusurvnet", "eip", "ihsp", "ca", "co", "ct", "ga", "md", |
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"mn", "nm", "nya", "nyr", "or", "tn", "id", "ia", "mi", |
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"oh", "ok", "ri", "sd", "ut"))) |
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stop("Error: area must be one of flusurvnet, eip, ihsp, or a valid state abbreviation") |
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if (length(area) != 1) |
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stop("Error: can only select one area") |
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if (!all(age_group %in% c("overall", "0-4y", "5-17y", "18-49y", |
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"50-64y", "65+y"))) |
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stop("Error: invalid age group specified") |
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if (any(years < 2009)) |
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stop("Error: years should be >= 2009") |
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# Match names of age groups to numbers for API |
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age_match <- data.frame(age_group = c("overall", "0-4y", "5-17y", |
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"18-49y", "50-64y", "65+y"), |
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code = c(6, 1, 2, 3, 4, 5)) |
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age_group_num <- age_match$code[age_match$age_group %in% age_group] |
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# format the input parameters to fit the CDC API |
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years <- years - 1960 |
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area_match <- data.frame(area = c("flusurvnet", "eip", "ca", "co", "ct", |
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"ga", "md", "mn", "nm", "nya", "nyr", "or", |
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"tn", "ihsp", "id", "ia", "mi", "oh", "ok", |
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"ri", "sd", "ut"), |
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catch = c(22, 22, 1, 2, 3, 4, 7, 9, 11, 13, 14, 17, |
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20, 22, 6, 5, 8, 15, 16, 18, 19, 21), |
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network = c(1, rep(2, 12), rep(3, 9))) |
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# Format years |
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year_list <- lapply(seq_along(years), |
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function(x) list(ID = years[x])) |
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# Format age group |
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age_list <- lapply(seq_along(age_group_num), |
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function(x) list(ID = age_group_num[x])) |
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params <- list(AppVersion = "Public", |
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agegroups = age_list, |
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catchmentid = area_match$catch[area_match$area == area], |
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networkid = area_match$network[area_match$area == area], |
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seasons = year_list) |
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out_file <- tempfile(fileext=".json") |
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# CDC API returns a ZIP file so we grab, save & expand it to then read in CSVs |
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tmp <- httr::POST("https://gis.cdc.gov/GRASP/Flu3/PostPhase03DownloadData", |
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body = params, |
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encode = "json", |
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httr::write_disk(out_file, overwrite = T)) |
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httr::stop_for_status(tmp) |
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if (!(file.exists(out_file))) |
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stop("Error: cannot process downloaded data") |
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file <- jsonlite::fromJSON(out_file)[[1]] |
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# pb <- dplyr::progress_estimated(length(file)) |
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# purrr::map(file, function(x) { |
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# pb$tick()$print() |
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# ct <- ifelse(grepl("who", x, ignore.case=TRUE), 1, 1) |
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# suppressMessages(readr::read_csv(x, skip=ct)) |
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# }) -> file_list |
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# names(file_list) <- substr(basename(files), 1, nchar(basename(files)) - 4) |
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# Depending on the parameters, there could be more than one |
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# file returned. When there's only one, return a more usable |
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# structure. |
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# when no rows, then it's likely the caller specified the |
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# current year and the flu season has technically not started yet. |
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# so help them out and move the year back and get current flu |
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# season data. |
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if ((nrow(file) == 0) && |
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(length(years)==1) && |
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(years == (as.numeric(format(Sys.Date(), "%Y"))-1960))) { |
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message("Adjusting [years] to get current season...") |
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return(get_hosp_data(area=area, age_group=age_group, |
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years=years+1960-1)) |
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} else { |
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return(file) |
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} |
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} |
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@ -0,0 +1,42 @@ |
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% Generated by roxygen2: do not edit by hand |
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% Please edit documentation in R/get_hosp_data.R |
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\name{get_hosp_data} |
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\alias{get_hosp_data} |
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\title{Retrieves influenza hospitalization statistics from the CDC} |
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\usage{ |
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get_hosp_data(area = "flusurvnet", age_group = "overall", |
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years = as.numeric(format(Sys.Date(), "\%Y")) - 1) |
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} |
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\arguments{ |
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\item{area}{one of "\code{flusurvnet}", "\code{eip}", "\code{ihsp}", or two |
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digit state abbreviation for an individual site. Exceptions are |
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New York - Albany ("\code{nya}") and New York - Rochester ("\code{nyr}")} |
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|
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\item{age_group}{a vector of age groups to pull data for. Possible values are: |
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"\code{overall}", "\code{0-4y}", "\code{5-17y}, "\code{18-49y}, |
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"\code{50-64y}, "\code{65+y}".} |
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|
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\item{years}{a vector of years to retrieve data for (i.e. \code{2014} for CDC |
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flu season 2014-2015). Default value is the current year and all |
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\code{years} values should be >= \code{2009}} |
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} |
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\value{ |
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A single \code{data.frame}. |
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} |
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\description{ |
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Uses the data source from the |
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\href{https://gis.cdc.gov/GRASP/Fluview/FluHospRates.html}{CDC FluView} |
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and provides influenza hospitalization reporting data as a data frame. |
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} |
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\note{ |
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There is often a noticeable delay when making the API request to the CDC. |
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This is not due to a large download size, but the time it takes for their |
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servers to crunch the data. Wrap the function call in \code{httr::with_verbose} |
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if you would like to see what's going on. |
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} |
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\examples{ |
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\dontrun{ |
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# All of FluSurv-NET, 50-64 years old, 2010/11-2014/15 flu seasons |
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flu <- get_hosp_data("flusurvnet", "50-64y", years=2010:2014) |
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} |
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} |
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