r - 在 R 中使用 mlogit 的级别错误

Question

我在关卡上遇到了一些问题...运行以下命令:

library(mlogit)

panel.datasm = data.frame(
    cbind( 
        round(runif(100, min=1, max=6)), 
        rep(1:20,each=5), runif(100, min=0, max=1), 
        runif(100, min=0, max=6), 
        runif(100, min=2, max=6) , 
        runif(100, min=0, max=1), 
        runif(100, min=0, max=6), 
        runif(100, min=2, max=6)  ))
names(panel.datasm) = c("choice", "id", "data_1991","data_1992",
  "data_1993", "data2_1991", "data2_1992","data2_1993") 


logit.data <- mlogit.data(panel.datasm, id = "id", choice = "choice", 
    varying= 3:5, shape = "wide", sep = "_")

不断收到错误 Error in Ops.factor(data[[choice]], alt) : level sets of factors are different

我也试过手动分配级别:

panel.datasm$id= factor(
    panel.datasm$id, 
    levels = sort(as.character(unique(panel.datasm$id)))  )

我已经尝试了很多东西，但无法弄清楚哪里出了问题。为了进行比较，请查看:

data("Electricity", package = "mlogit")
head(Electricity)
Electr <- mlogit.data(Electricity, id = "id", choice = "choice", 
    varying = 3:26, shape = "wide", sep = "")

据我所知，这与我的数据格式相同。这里发生了什么？我快结束了。

Answer 1

我相信我已经找到问题所在。您的 choice 变量和您的 alternative 变量应该相同。

如果您将 data.frame 的第一列更改为具有 1991:1993 之间的值，它将起作用。

panel.datasm = data.frame(
    cbind( 
        sample(1991:1993, 100, replace=TRUE), 
        rep(1:20,each=5), runif(100, min=0, max=1), 
        runif(100, min=0, max=6), 
        runif(100, min=2, max=6) , 
        runif(100, min=0, max=1), 
        runif(100, min=0, max=6), 
        runif(100, min=2, max=6)  ))
names(panel.datasm) = c("choice", "id", "data_1991","data_1992",
    "data_1993", "data2_1991", "data2_1992","data2_1993") 


logit.data <- mlogit.data(panel.datasm, id = "id", choice = "choice", 
    varying= 3:5, shape = "wide", sep = "_") 

结果:

head(logit.data)
       choice id  alt       data     data2 chid
1.1991  FALSE  1 1991 0.03540498 0.9726110    1
1.1992  FALSE  1 1992 5.85285278 2.7973798    1
1.1993   TRUE  1 1993 5.80795641 3.7360297    1
2.1991   TRUE  1 1991 0.59255235 0.2564928    2
2.1992  FALSE  1 1992 5.81443351 3.0820215    2
2.1993  FALSE  1 1993 2.11699854 5.4161634    2

---

如果您现在将它与电力 进行比较，区别就很明显了。请注意，选项是 1:4，每个选项的范围从 1 到 4。

head(Electricity)
  choice id pf1 pf2 pf3 pf4 cl1 cl2 cl3 cl4 loc1 loc2 loc3 loc4 wk1 wk2 wk3 wk4
1      4  1   7   9   0   0   5   1   0   5    0    1    0    0   1   0   0   1
2      3  1   7   9   0   0   0   5   1   5    0    0    1    0   1   1   0   0
3      4  1   9   7   0   0   5   1   0   0    0    0    0    1   0   1   1   0
4      4  1   0   9   7   0   1   1   0   5    0    0    1    0   1   0   0   1
5      1  1   0   9   0   7   0   1   0   5    1    0    0    0   0   1   0   1
6      4  1   0   9   0   7   0   0   1   5    0    0    1    0   0   0   0   1