生物统计学(第3版)杜荣骞课后习题答案第8章单因素方差分析.doc
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第八章 单因素方差分析
8.1 黄花蒿中所含的青蒿素是当前抗疟首选药物，研究不同播期对黄花蒿种子产量的影响，试验采用完全随机化设计，得到以下结果(kg/小区)[47]：
重 复播 种 期2月19日3月9日3月28日4月13日10.260.140.120.0320.490.240.110.0230.360.210.150.04对上述结果做方差分析。
答：所用程序及结果如下：
options linesize=76 nodate;
data mugwort;
do date=1 to 4;
do repetit=1 to 3;
input yield @@;
output;
end;
end;
cards;
0.26 0.49 0.36
0.14 0.24 0.21
0.12 0.11 0.15
0.03 0.02 0.04
;
run;
proc anova;
class date;
model yield=date;
means date/duncan;
run;
One-Way ANOVA
Analysis of Variance Procedure
Class Level Information
Class Levels Values
DATE 4 1 2 3 4
Number of observations in data set = 12
One-Way ANOVA
Analysis of Variance Procedure
Dependent Variable: YIELD
Sum of Mean
Source DF Squares Square F Value Pr F
Model 3 0 0 14.99 0.0012
Error 8 0 0Corrected Total 11 0 R-Square C.V. Root MSE YIELD Mean
0.848993 35.48088 0.06416 0.18083
Source DF Anova SS Mean Square F Value Pr F
DATE 3 0 0 14.99 0.0012
One-Way ANOVA
Analysis of Variance Procedure
Duncans Multiple Range Test for variable: YIELD
NOTE: This test controls the type I comparisonwise error rate, not
the experimentwise error rate
Alpha= 0.05 df= 8 MSE= 0.004117
Number of Means 2
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