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Quarterly interest rate recorded for Treasury bills from 1953-Ito 1980-II, n = 110 observations.
The format is: Time-Series [1:110] from 1953 to 1980: 1.98 2.15 1.96 1.47 1.06 ...
pairs with qinfl (inflation)
See http://www.stat.pitt.edu/stoffer/tsa4/
qinfl