R语言 进行F测试–var.test()方法
R编程语言中的var.test()方法 在两个正态种群之间进行F检验,假设两个种群的变异性相等。
R语言 var.test()方法语法
语法: var.test()
返回: 返回某个假设的F-测试分数。
R编程语言中的var.test()方法示例
例子1 :
x <- rnorm(50, mean=0)
y <- rnorm(50, mean=1)
# Using var.test() method
gfg <- var.test(x, y)
print(gfg)
输出
F test to compare two variances
data: x and y
F = 1.0779, num df = 49, denom df = 49, p-value = 0.794
alternative hypothesis: true ratio of variances is not equal to 1
95 percent confidence interval:
0.6116778 1.8994484
sample estimates:
ratio of variances
1.077892
例2 :
x <- rnorm(50, mean=1.2)
y <- rnorm(50, mean=1.8)
# Using var.test() method
gfg <- var.test(x, y)
print(gfg)
输出
F test to compare two variances
data: x and y
F = 2.382, num df = 49, denom df = 49, p-value = 0.002911
alternative hypothesis: true ratio of variances is not equal to 1
95 percent confidence interval:
1.351715 4.197491
sample estimates:
ratio of variances
2.381976