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#' @title bcbExpectMTop5
#'
#' @description Monthly Market Expectations Top5.
#'
#'
#' @param variables Possible options: "Media", "Mediana", "DesvioPadrao",
#' "CoeficienteVariacao", "Minimo", "Maximo".
#' @param start Initial date at which the data was projected, in ISO format.
#' @param end Final date at which the data was projected, in ISO format.
#' @param indicator A string. Available indicator.
#' @param limit A integer. A limint of data in request, top is 10000.
#'
#'
#' @import rjson
#' @return A data.frame.
#' @export
#'
#'
#' @note The available indicators are: IGP-DI, IGP-M, IPCA, Meta para taxa over-selic, Taxa de cambio.
#'
#' @examples
#' # bcbExpectMTop5()
#'
#'
#'
bcbExpectMTop5 <- function(indicator = 'IGP-DI',limit = 100, variables = c("tipoCalculo","Media","Mediana","DesvioPadrao","CoeficienteVariacao","Minimo","Maximo"), start, end ){
indicator = str_replace_all(indicator," ","%20")
if(limit > 10000 | limit < 0)stop("You need provid a limit in between 0 and 10000!")
# variaveis
variaveis_a <- paste("filter=Indicador%20eq%20'",indicator,"'",sep="")
variaveis_b <- paste("top=",limit,sep="")
variaveis_c <- paste("Indicador", "IndicadorDetalhe", "Data",
"DataReferencia", variables, sep = ",")
if(missing(start) & missing(end)){
timespan <- ""
}else if(missing(start) & !missing(end)){
timespan <- paste0("%20and%20Data%20gt%20'", start,"'")
}else if(!missing(start) & !missing(end)){
timespan <- paste0("%20and%20Data%20gt%20'", start, "'%20and%20", "Data%20lt%20'", end,"'")
}else{
timespan <- paste0("%20and%20Data%20lt%20'", end,"'")
}
baseurl <- "https://olinda.bcb.gov.br/olinda/servico/Expectativas/versao/v1/odata/"
query_url <- paste(baseurl, "ExpectativasMercadoTop5Mensais", "?$",variaveis_b,"&$",variaveis_a,timespan,
"&$select=",variaveis_c, sep = "", collapse = "")
data <- fromJSON(file = query_url)$value
data <- do.call("rbind", lapply(data, as.data.frame))
return(data)
}
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