MANOVA R中错误消息：“dimnames'[1]不等于阵列程度的长度 [英] manova in R error message: length of 'dimnames' [1] not equal to array extent

问题描述

试图在这个数据上运行MANOVA：

Trying to run manova on this data:

创建一个data.frame：

Create a data.frame:

acc <- data.frame(Degrees = c("5","8","10"), MPH10=c(0.35, 0.37, 0.32),
MPH25=c(0.19, 0.28, 0.30), MPH40=c(0.14, 0.19, 0.29), MPH55=c(0.10, 0.19, 0.23))

检查data.frame：

check the data.frame:

 acc
  Degrees MPH10 MPH25 MPH40 MPH55
1     5  0.35  0.19  0.14  0.10
2     8  0.37  0.28  0.19  0.19
3     10  0.32  0.30  0.29  0.23

我输入：

acc_manova <- manova(cbind(MPH10,MPH25,MPH40,MPH55) ~ Degrees, data = acc)

然后运行它：

 acc_manova

我得到一个错误信息：

I get an error message:

Call:
   manova(cbind(MPH10, MPH25, MPH40, MPH55) ~ as.factor(Degrees), 
    data = acc)

Terms:
Error in dimnames(tmp) <- list(c(rn, "Deg. of Freedom"), nmeffect) : 
  length of 'dimnames' [1] not equal to array extent

所以我想它与度列的名称做：D05，D08，D10，所以我放弃了D和0占位符。有相同的错误消息

So I figure it has to do with the names of the degrees column: d05,d08,d10 so I dropped the d and 0 place holder. Had the same error message

然后我加入as.factor（度），又跑到acc_manova，并用同样的错误出现了。

then I added as.factor(Degrees), ran acc_manova again, and came up with the same error.

在这个任何想法？

推荐答案

您度列不是数字，而是一个因子（分类数据）。更改因子数值解决您的问题：

Your Degrees column is not numeric, but a factor (categorical data). Changing the factor to numeric solves your problem:

acc$Degrees = as.numeric(acc$Degrees)
acc_manova <- manova(cbind(MPH10,MPH25,MPH40,MPH55) ~ Degrees, data = acc)
> acc_manova
Call:
   manova(cbind(MPH10, MPH25, MPH40, MPH55) ~ Degrees, data = acc)

Terms:
                    Degrees   Residuals
resp 1           1.2500e-03  1.6667e-05
resp 2          0.000200000 0.006666667
resp 3          0.005000000 0.006666667
resp 4          0.000800000 0.008066667
Deg. of Freedom           1           1

Residual standard error: 0.004082483 0.08164966 0.08164966 0.08981462 
Estimated effects may be unbalanced

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