Description Usage Arguments Value Author(s) See Also Examples
The 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.
1 |
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. |
useGW |
Boolean argument specifying the system membership coding. TRUE (Default): Gleditsch and Ward (1999). FALSE: Correlates of War. |
A SpatialPolygonsDataFrame
, containing the complete CShapes dataset, or the CShapes snapshot for the specified date.
Nils B. Weidmann
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # 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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