Caret 需要 TRUE/FALSE 的缺失值 [英] missing value where TRUE/FALSE needed with Caret

问题描述

我有一个数据框，其中包含日期变量".(测试数据和代码可在此处获得)

I have a data frame, which contains the "date variable". (the test data and code is available here)

但是，我使用function = caretFunc".它显示错误消息.

However, I use "function = caretFunc". It shows error message.

    Error in { : task 1 failed - "missing value where TRUE/FALSE needed"
In addition: Warning messages:
1: In FUN(newX[, i], ...) : NAs introduced by coercion
2: In FUN(newX[, i], ...) : NAs introduced by coercion
3: In FUN(newX[, i], ...) : NAs introduced by coercion
4: In FUN(newX[, i], ...) : NAs introduced by coercion
5: In FUN(newX[, i], ...) : NAs introduced by coercion
6: In FUN(newX[, i], ...) : NAs introduced by coercion
7: In FUN(newX[, i], ...) : NAs introduced by coercion
8: In FUN(newX[, i], ...) : NAs introduced by coercion
9: In FUN(newX[, i], ...) : NAs introduced by coercion
10: In FUN(newX[, i], ...) : NAs introduced by coercion

我能做什么?

重现错误的代码:

library(mlbench)
library(caret)
library(maps)
library(rgdal)
library(raster)
library(sp)
library(spdep)
library(GWmodel)
library(e1071)
library(plyr)
library(kernlab)
library(zoo)

mydata <- read.csv("Realestatedata_all_delete_date.csv", header=TRUE)
mydata$estate_TransDate <- as.Date(paste(mydata$estate_TransDate,1,sep="-"),format="%Y-%m-%d")
mydata$estate_HouseDate <- as.Date(mydata$estate_HouseDate,format="%Y-%m-%d")

rfectrl <- rfeControl(functions=caretFuncs, method="cv",number=10,verbose=TRUE,returnResamp = "final")
results <- rfe(mydata[,1:48],mydata[,49],sizes = c(1:48),rfeControl=rfectrl,method = "svmRadial")

print(results)
predictors(results)
plot(results, type=c("g", "o"))

推荐答案

您在 mydata 中的以下输入变量中有 NAs(缺失值)(您提供给分类器):

You have NAs (missing values) in mydata in the following input variables (which you feed to the classifier):

colnames(mydata)[unique(which(is.na(mydata[,1:48]), arr.ind = TRUE)[,2])]

给出:

 [1] "Aport_Distance"       "Univ_Distance"        "ParkR_Distance"
 [4] "TRA_StationDistance"  "THSR_StationDistance" "Schools_Distance"
 [7] "Lib_Distance"         "Sport_Distance"       "ParkS_Distance"
[10] "Hyper_Distance"       "Shop_Distance"        "Post_Distance"
[13] "Hosp_Distance"        "Gas_Distance"         "Incin_Distance"
[16] "Mort_Distance" 

此外，看起来您的日期变量(交易日期和房屋日期)似乎在 rfe(..) 中转换为 NAs .

In addition, it looks like your date variables (transaction date and house date) seem to be converted to NAs inside rfe(..) .

SVM 回归器似乎无法按原样处理 NAs.

The SVM regressor seems not to be able to deal with NAs as is.

我会将日期转换为自给定参考以来的年数":

I would convert the dates to something like 'years since a given reference':

mydata$estate_TransAge <- as.numeric(as.Date("2015-11-01") - mydata$estate_TransDate) / 365.25
mydata$estate_HouseAge <- as.numeric(as.Date("2015-11-01") - mydata$estate_HouseDate) / 365.25

# define the set of input variables
inputVars = setdiff(colnames(mydata),

                    # exclude these
                    c("estate_TransDate", "estate_HouseDate", "estate_TotalPrice")
                   )

并且还删除您用作回归器输入的任何列中带有任何 NA 的条目:

And also remove those entries with any NA in any of the columns you use as input to the regressor:

traindata <- mydata[complete.cases(mydata[,inputVars]),]

然后使用以下命令运行 rfe:

then run rfe with:

rfectrl <- rfeControl(functions=caretFuncs, method="cv",number=10,verbose=TRUE,returnResamp = "final")
results <- rfe(
               traindata[,inputVars], 
               traindata[,"estate_TotalPrice"],
               rfeControl=rfectrl,
               method = "svmRadial"
              )

在我的例子中，这需要很长时间才能完成，所以我只对百分之一的数据进行了测试:

In my case, this would have taken a long time to complete, so I tested it only on one percent of the data using:

traindata <- sample_frac(traindata, 0.01)

问题仍然是，如果您有数据来预测价格，其中一些输入变量为 NA.

The question remains what to do if your are given data to predict the price where some of input variables as NA.

这篇关于Caret 需要 TRUE/FALSE 的缺失值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！