1880 0.032596 30.678489 5.2689% 1905 0.034831 28.710060 -3.7992% 1877 0.044051 22.701075 -3.6586% 1881 0.028559 35.015412 2.4963% 1880 0.304193 3.287381 0.0000% 1879 0.620192 1.612404 0.0000% 1879 0.042894 23.313132 0.0000% 1879 0.304193 3.287381 5.2689% 1905 0.571418 1.750033 2.6987% 1904 0.263346 3.797279 0.0000% 1903
stratifying