options(width = 120) knitr::opts_chunk$set(results = "hold")
Searching for data within Dataverse is quite easy using the dataverse_search()
function. The simplest searches simply consist of a query string:
library("dataverse") Sys.setenv("DATAVERSE_SERVER" = "dataverse.harvard.edu") dataverse_search("Gary King")[c("name")]
The results are paginated, so users can rely upon the per_page
and start
argument to requested subsequent pages of results. We'll start at 6 and to show that we retrieve the last five results from the previous query plus 15 more (due to per_page = 20
):
dataverse_search("Gary King", start = 6, per_page = 20)[c("name")]
More complicated searches can specify metadata fields like title
and restrict results to a specific type
of Dataverse object (a "dataverse", "dataset", or "file"):
ei <- dataverse_search(author = "Gary King", title = "Ecological Inference", type = "dataset", per_page = 20) # fields returned names(ei) # names of datasets ei$name
Once datasets and files are identified, it is easy to download and use them directly in R. See the "Data Download" vignette for details.
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