Nothing
## ----setup, cache = FALSE, echo = FALSE, message = FALSE, warning = FALSE, tidy = FALSE----
knitr::opts_chunk$set(eval = FALSE)
## ----gravity_no_zeros---------------------------------------------------------
# # 1: Import and read the dataset
#
# # As of 2022-09-25 the original link from Sciences Po is broken
# # I kept the zip on GitHub back in 2017, fortunately
# # url <- "http://econ.sciences-po.fr/sites/default/files/file/tmayer/data/col_regfile09.zip"
# url <- "https://github.com/pachadotdev/gravity/blob/master/vignettes/col_regfile09.zip?raw=true"
# zip <- "col_regfile09.zip"
#
# if (!file.exists(zip)) {
# try(download.file(url, zip))
# }
# try(system("7z e -aos col_regfile09.zip"))
#
# library(haven)
# col_regfile09 <- read_dta("col_regfile09.dta")
#
# # 2: Isolation of one year
#
# library(dplyr)
# data06 <- col_regfile09 %>%
# filter(year == 2006)
#
# # 3: Choosing variables
#
# data06 <- data06 %>%
# select(iso_o, iso_d, distw, gdp_o, gdp_d, rta, flow, contig, comlang_off, comcur)
#
# # 4: Isolation of complete cases
#
# library(tidyr)
# gravity_zeros <- data06 %>%
# drop_na()
#
# # 5: Exclusion of trade flows equal to 0
#
# gravity_no_zeros <- gravity_zeros %>%
# filter(flow > 0)
#
# # 6: Export the data
#
# save(gravity_zeros, file = "gravity_zeros.rdata", compress = "xz")
# save(gravity_no_zeros, file = "gravity_no_zeros.rdata", compress = "xz")
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