[英]Why isnt my logistic regression model output a factor of 2 levels? (Error: `data` and `reference` should be factors with the same levels.)
[英]Error: `data` and `reference` should be factors with the same levels. Confusion matrix for Logistic Regression
关于这个特定错误,我已经看到了很多答案。 对于我的特定问题,我还没有找到任何答案。 因此,我的问题
这就是我所做的:
shortness_breath_data <- data_categ_nosev %>%
dplyr::select(shortness_breath, obesity, asthma, diabetes_type_one, diabetes_type_two, obesity, hypertension, heart_disease, lung_condition, liver_disease, kidney_disease, Covid_tested, Gender)
这是put(head(shortness_breath_data))
:
structure(list(shortness_breath = structure(c(1L, 2L, 1L, 1L,
1L, 2L), .Label = c("No", "Yes"), class = "factor"), obesity = structure(c(1L,
1L, 2L, 2L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
asthma = structure(c(2L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), diabetes_type_one = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
diabetes_type_two = structure(c(2L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), hypertension = structure(c(1L,
1L, 1L, 2L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
heart_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), lung_condition = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
liver_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), kidney_disease = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
Covid_tested = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("negative",
"positive"), class = "factor"), Gender = structure(c(2L,
1L, 2L, 1L, 1L, 2L), .Label = c("Female", "Male", "Other"
), class = "factor")), row.names = c(NA, -6L), class = c("tbl_df",
"tbl", "data.frame"), problems = structure(list(row = c(2910L,
35958L), col = c("how_unwell", "how_unwell"), expected = c("a double",
"a double"), actual = c("How Unwell", "How Unwell"), file = c("'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'",
"'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'"
)), row.names = c(NA, -2L), class = c("tbl_df", "tbl", "data.frame"
)))
我将其分为训练和测试数据集。
shortness_breath_data$shortness_breath <- as.factor(shortness_breath_data$shortness_breath)
n <- nrow(shortness_breath_data)
set.seed(22)
trainingdx <- sample(1:n, 0.7 * n)
train <- shortness_breath_data[trainingdx,]
validate <- shortness_breath_data[-trainingdx,]
train %>% distinct(shortness_breath)
validate %>% distinct(shortness_breath)
并且只是为了防止您在查找问题时减轻您的工作,我提供了dput(head(train))
和dput(head(validate))
训练数据集:
structure(list(shortness_breath = structure(c(1L, 1L, 1L, 1L,
1L, 1L), .Label = c("No", "Yes"), class = "factor"), obesity = structure(c(2L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
asthma = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), diabetes_type_one = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
diabetes_type_two = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), hypertension = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
heart_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), lung_condition = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
liver_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), kidney_disease = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
Covid_tested = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("negative",
"positive"), class = "factor"), Gender = structure(c(1L,
1L, 1L, 2L, 1L, 2L), .Label = c("Female", "Male", "Other"
), class = "factor")), row.names = c(NA, -6L), class = c("tbl_df",
"tbl", "data.frame"), problems = structure(list(row = c(2910L,
35958L), col = c("how_unwell", "how_unwell"), expected = c("a double",
"a double"), actual = c("How Unwell", "How Unwell"), file = c("'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'",
"'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'"
)), row.names = c(NA, -2L), class = c("tbl_df", "tbl", "data.frame"
)))
验证数据集:
structure(list(shortness_breath = structure(c(1L, 2L, 2L, 1L,
1L, 1L), .Label = c("No", "Yes"), class = "factor"), obesity = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
asthma = structure(c(2L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), diabetes_type_one = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
diabetes_type_two = structure(c(2L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), hypertension = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
heart_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), lung_condition = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
liver_disease = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("No",
"Yes"), class = "factor"), kidney_disease = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = c("No", "Yes"), class = "factor"),
Covid_tested = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("negative",
"positive"), class = "factor"), Gender = structure(c(2L,
1L, 2L, 2L, 1L, 1L), .Label = c("Female", "Male", "Other"
), class = "factor")), row.names = c(NA, -6L), class = c("tbl_df",
"tbl", "data.frame"), problems = structure(list(row = c(2910L,
35958L), col = c("how_unwell", "how_unwell"), expected = c("a double",
"a double"), actual = c("How Unwell", "How Unwell"), file = c("'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'",
"'/Users/gabrielburcea/Rprojects/data/data_lev_categorical_no_sev.csv'"
)), row.names = c(NA, -2L), class = c("tbl_df", "tbl", "data.frame"
)))
然后,我使用逐步前向方法构建我的逻辑回归 model。
null_model <- glm(shortness_breath ~ 1, data = train, family = "binomial")
fm_shortness_breath <- glm(shortness_breath ~., data = train, family = "binomial")
stepmodel <- step(null_model, scope = list(lower = null_model, upper = fm_shortness_breath), direction = "forward")
然后我得到我的摘要 model 并将预测存储在源数据框中。
summary(stepmodel)
validate$pred <- predict(stepmodel, validate, type = "response")
validate$real <- validate$shortness_breath
train$pred <- predict(stepmodel, train, type = "response")
train$real <- train$shortness_breath
然后我 plot 我的 ROC 曲线没有问题:
plot.roc(validate$real, validate$pred, col = "red", main = "ROC Validation Set", percent = TRUE, print.auc = TRUE)
然而,当我试图得到我的混淆矩阵时,这就是我得到错误的地方。 但这是我的代码:
cm_stepmodel <- confusionMatrix(stepmodel, validate)
然后,错误出现:
Error: `data` and `reference` should be factors with the same levels.
使用显示回溯:
3.
stop("`data` and `reference` should be factors with the same levels.", call. = FALSE)
2.
confusionMatrix.default(stepmodel, validate)
1.
confusionMatrix(stepmodel, validate)
我根本没有看到问题。 并尝试了其他几个选项,但没有奏效。 我已经逐步复制了我正在采用的确切方法。 我没有得到我的答案。 此外,我还用 RMarkdown 标记了这个问题,以及插入符号和 R,以防万一。
此外,使用的库是:
library(tidyverse)
library(conflicted)
library(tidymodels)
library(ggrepel)
library(corrplot)
library(dplyr)
library(corrr)
library(themis)
library(rsample)
library(caret)
library(forcats)
library(rcompanion)
library(MASS)
library(pROC)
library(ROCR)
library(data.table)
尝试将您的预测概率转换为标签,然后在此运行您的confusionMatrix:
validate$pred <- predict(stepmodel, validate, type = "response")
validate$pred_label <- as.factor(ifelse(validate$pred >= 0.5, "Yes", "No"))
confusionMatrix(validate$real, validate$pred) # Error
confusionMatrix(validate$real, validate$pred_label) # This will work
检查您是否像在validate$pred_label
语句中的原始数据集中一样正确分配标签。
我对confusionMatrix
矩阵不是特别熟悉,但总体思路是您对标签进行预测并与数据的实际标签进行比较。 它抛出了一个错误,因为您正在将标签与概率进行比较——您需要分配标签。 如果我在上面犯了概念错误或编码错误,请纠正我。
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