a factor with levels
ARAPAHOEBRULEBUCKSKINCENTURACENTURK78CHEYENNECODYCOLTGAGEHOMESTEADKS831374LANCERLANCOTANE83404NE83406NE83407NE83432NE83498NE83T12NE84557NE85556NE85623NE86482NE86501NE86503NE86507NE86509NE86527NE86582NE86606NE86607NE86T666NE87403NE87408NE87409NE87446NE87451NE87457NE87463NE87499NE87512NE87513NE87522NE87612NE87613NE87615NE87619NE87627NORKANREDLANDROUGHRIDERSCOUT66SIOUXLANDTAM107TAM200VONA
yield
a numeric vector
latitude
a numeric vector
longitude
a numeric vector
Source
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S
and S-PLUS, Springer, New York.