reg6_4.sas

黄燕 吴平《SAS统计分析及应用》 书中一些例子的SAS程序代码

data data_prg.reg6_4;
	input n po k y @@;
	label n="氮肥" po="磷肥" k="钾肥" y="施肥利润";
npk=n+po+k;
cards;
0    8   18   414.3    8   20    6   492    16    8   30   531.5
24  20   12   655.7   32   4     0   658    40   16   24   615.2
0    4    6   434.9    8   16   30   460.1  16    0   18   501.8
24  12    0   715.5   32   0    24   532.9  40   12   12   668.7
;
run;
proc plot ;
plot y*n='n'  y*po='p' y*k='k' y*npk='*';
run;
proc reg;
	model y=n po k/selection=forward;
	model y=n po k/selection=b;
	model y=n po k/selection=stepwise;
run;