我正在尝试使用以下代码进行bootstrap重采样 . 我从http://spark.rstudio.com/ahmed/bootstrap/获得了此代码 . 我想使用我的数据集从网站绘制相同的图 . data1和data2是文本文件,只包含一列 .
a = read.table("/home/Desktop/data1.txt")
b = read.table("/home/Desktop/data2.txt")
diff.observed = mean(b) - mean(a)
Warning messages:
1: In mean.default(b) : argument is not numeric or logical: returning NA
2: In mean.default(a) : argument is not numeric or logical: returning NA
> diff.observed
[1] NA
我没有得到观察数据集的平均值 .
alpha = 0.05
# Number of replicates
n = 1000
# Difference between means of bootstrapped datasets (n replicates)
diff.bootstrap = NULL
for (i in 1 : n) {
# Sample with replacement
a.bootstrap = sample (a, length(a), TRUE)
b.bootstrap = sample (b, length(b), TRUE)
diff.bootstrap[i] = mean(b.bootstrap) - mean(a.bootstrap)
}
plot(density(a.bootstrap))
plot(density(b.bootstrap))
plot(density(diff.bootstrap))
Error in density.default(diff.bootstrap) : 'x' contains missing values
我不明白这个错误 . 您的建议将不胜感激!
1 回答
您可以将数据加载到
matrix
然后mean
应该工作: