These are state-year level data for surplus and gross domestic product for Correlates of War state system members. Data also include population estimates for per capita standardization.
cow_sdp_gdpA data frame with 27753 observations on the following five variables.
ccodea numeric vector for the Correlates of War state code
yeara numeric vector for the year
wbgdp2011esta numeric vector for the estimated natural log of GDP in 2011 USD (log-transformed)
wbpopesta numeric vector for the estimated population size (log-transformed)
sdpesta numeric vector for the estimated surplus domestic product (log-transformed)
These were extracted from the actual replication files from International Studies Quarterly. Because these data are ultimately being simulated, a user can expect some slight differences between the Correlates of War version of these data (which Anders et al. published) and the Gleditsch-Ward version of these data (which appear to be the one the authors will more vigorously support going forward).
Anders, Therese, Christopher J. Fariss, and Jonathan N. Markowitz. 2020. "Bread Before Guns or Butter: Introducing Surplus Domestic Product (SDP)" International Studies Quarterly 64(2): 392--405.