ustyc: Fetch US Treasury yield curve data
Forms a query to submit for US Treasury yield curve data, posting
this query to the US Treasury web site's data feed service. By default the
download includes data yield data for 12 products from January 1, 1990,
some of which are NA during this span. The caller can pass parameters to
limit the query to a certain year or year and month, but the full download
is not especially large. The download data from the service is in XML
format. The package's main function transforms that XML data into a numeric
data frame with treasury product items (constant maturity yields for 12 kinds
of bills, notes, and bonds) as columns and dates as row names. The function
returns a list which includes an item for this data frame as well as query-related
values for reference and the update date from the service.
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