cshp function makes the cshapes dataset available for usage in R. If no date is given, it returns a
SpatialPolygonsDataFrame with the complete CShapes dataset. If specified, the date is used to create a snapshot of the dataset, containing all cshapes polygons active at the given date.
The date for which the cshapes polygons should be extracted. This argument must be of type Date and must be in the range 1/1/1946 - 30/6/2012. If omitted, the complete dataset is returned.
Boolean argument specifying the system membership coding. TRUE (Default): Gleditsch and Ward (1999). FALSE: Correlates of War.
SpatialPolygonsDataFrame, containing the complete CShapes dataset, or the CShapes snapshot for the specified date.
Nils B. Weidmann
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# Retrieve the dataset cshp.data <- cshp() # Get summary statistics summary(cshp.data) # Extract Switzerland switzerland <- cshp.data[cshp.data$COWCODE==225,] # Plot Switzerland plot(switzerland) # Extract a snapshot of cshapes as of June 30, 2002 # using the Gleditsch&Ward coding system cshp.2002 <- cshp(date=as.Date("2002-6-30"), useGW=TRUE)
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