文档介绍：第九章两因素及多因素方差分析
双菊饮具有很好的治疗上呼吸道感染的功效,为便于饮用,制成泡袋剂。研究不同浸泡时间和不同的浸泡温度对浸泡效果的影响,设计了一个两因素交叉分组实验,实验结果(浸出率)见下表[52]:
浸泡温度
/℃
浸泡时间/min
10
15
20
60
80
95
对以上结果做方差分析及Duncan检验。该设计已经能充分说明问题了吗?是否还有更能说明问题的设计方案?
答:无重复二因素方差分析程序及结果如下:
options linesize=76 nodate;
data hermed;
do temp=1 to 3;
do time=1 to 3;
input effect @@;
output;
end;
end;
cards;
;
run;
proc anova;
class temp time;
model effect=temp time;
means temp time/duncan alpha=;
run;
The SAS System
Analysis of Variance Procedure
Class Level Information
Class Levels Values
TEMP 3 1 2 3
TIME 3 1 2 3
Number of observations in data set = 9
The SAS System
Analysis of Variance Procedure
Dependent Variable: EFFECT
Sum of Mean
Source DF Squares Square F Value Pr > F
Model 4
Error 4
Corrected Total 8
R-Square . Root MSE EFFECT Mean
Source DF Anova SS Mean Square F Value Pr > F
TEMP 2
TIME 2
The SAS System
Analysis of Variance Procedure
Duncan's Multiple Range Test for variable: EFFECT
NOTE: This test controls the type parisonwise error rate, not
the experimentwise error rate
Alpha= df= 4 MSE=
Number of Means 2 3
Critical Range
Means with the same letter are not significantly different.
Duncan Grouping Mean N TEMP
A 3 3
B 3 2
C 3 1
The SAS System
Analysis of Variance Procedure
Duncan's Multiple Range Test for variable: EFFECT
NOTE: This test controls the type parisonwise error rate, not
the experimentwise error rate
Alpha= df= 4 MSE=
Number of Means 2 3
Critical Range
Means with the same letter are not significantly different.
Duncan Grouping Mean N TIME
A 3 3
A
A 3 2
A
A 3 1
从方差