[英]Power analysis for unbalanced one-way ANOVA
I'm trying to calculate a power analysis (using pwr
package in R
) for an unbalanced one-way ANOVA
. 我正在尝试计算功率分析(使用R
pwr
包)进行不平衡单向ANOVA
。 I'm unsure how to appropriately weight the means or account for the unbalanced design. 我不确定如何适当地加权手段或解释不平衡的设计。 I currently have: 我目前有:
groups = 4
n = n
for each group (here, n1=12 for group 1, n2=8 for group 2, n3=9, for group 3, and n4=12) 每组n = n
(此处,组1的n1 = 12,组2的n2 = 8,组3的n3 = 9,n4 = 12)
between.var
and within.var
are known from the ANOVA analysis: 从方差分析中可以知道within.var
和within.var
between.var
within.var
:
(between.var=0.004363, within.var=0.003680)
And finally 最后
means = (0.1513, 0.1767, 0.1676, 0.1968). 平均值=(0.1513,0.1767,0.1676,0.1698)。
Any help would be appreciated. 任何帮助,将不胜感激。
Working with weighted means is described here: https://www.r-bloggers.com/r-tutorial-series-two-way-anova-with-unequal-sample-sizes/ 此处描述了使用加权平均值: https : //www.r-bloggers.com/r-tutorial-series-two-way-anova-with-unequal-sample-sizes/
#read the dataset into an R variable using the read.csv(file) function
dataTwoWayUnequalSample <- read.csv(“dataset_ANOVA_TwoWayUnequalSample.csv”)
#display the data
dataTwoWayUnequalSample
#use anova(object) to execute the Type I SS ANOVAs #use anova(object)执行Type I SS ANOVA
#environment ANOVA
anova(lm(math ~ environment * instruction, dataTwoWayUnequalSample))
#instruction ANOVA
anova(lm(math ~ instruction * environment, dataTwoWayUnequalSample))
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