回归分析论文
20.7 1959
21.9 1960
;
proc reg;
model wendu=nianfen;
print cli;
plot wendu*nianfen p.*nianfen l95.*nianfen u95.*nianfen/overlay; symbol1c=black v=triangle;
symbol2c=blue v=circle;
symbol3c=green v=square;
symbol4c=red v=star;
run;
程序（2）：
data ch;
input wendu nianfen @@;
cards;
19.6 1901
19.3 1902
19.9 1903
20.7 1904
20.8 1905
19.9 1906
20.7 1907
19.8 1908
21.3 1909
21.4 1910
21.1 1911
20.9 1912
22.8 1913
20.4 1914
22.9 1915
21.4 1916
21.6 1917
21.6 1918
20.5 1919
22.7 1920
20.0 1921
20.3 1922
21.0 1923
22.1 1924
20.9 1925