Error in `contrasts<-`(`tmp`, value = contr.funs[1 + isOF[nn]]): contrasts can be applied only to factors with 2 or more levels

Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]): contrasts can be applied only to factors with 2 or more levels

问题：

解决：

完整错误：

问题：

var2变量的内容全是4；

只有一个独特值（unique）;

#create data frame
df <- data.frame(var1=c(1, 3, 3, 4, 5),var2=as.factor(4),var3=c(7, 7, 8, 3, 2),var4=c(1, 1, 2, 8, 9))#view data frame
df#attempt to fit regression model
model <- lm(var4 ~ var1 + var2 + var3, data=df)

解决：

#剔除var2之后再构建回归模型；

#fit regression model without using var2 as a predictor variable
model <- lm(var4 ~ var1 + var3, data=df)#view model summary
summary(model)Call:
lm(formula = var4 ~ var1 + var3, data = df)Residuals:1        2        3        4        5 0.02326 -1.23256  0.91860  0.53488 -0.24419 Coefficients:Estimate Std. Error t value Pr(>|t|)
(Intercept)   8.4070     3.6317   2.315   0.1466
var1          0.6279     0.6191   1.014   0.4172
var3         -1.1512     0.3399  -3.387   0.0772 .
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1Residual standard error: 1.164 on 2 degrees of freedom
Multiple R-squared:  0.9569,    Adjusted R-squared:  0.9137
F-statistic: 22.18 on 2 and 2 DF,  p-value: 0.04314

完整错误：

Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]): contrasts can be applied only to factors with 2 or more levels
Traceback:1. lm(var4 ~ var1 + var2 + var3, data = df)
2. model.matrix(mt, mf, contrasts)
3. model.matrix.default(mt, mf, contrasts)
4. `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]])
5. stop("contrasts can be applied only to factors with 2 or more levels")

参考：How to Fix: contrasts can be applied only to factors with 2 or more levels

参考：R

参考：回归模型

参考：https://stackoverflow.com/questions/44200195/how-to-debug-contrasts-can-be-applied-only-to-factors-with-2-or-more-levels-er

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Error in contrasts can be applied only to factors with 2 or more levels

Error in `contrasts<-`(`tmp`, value = contr.funs[1 + isOF[nn]]): contrasts can be applied only to factors with 2 or more levels

问题：

解决：

完整错误：

Error in contrasts can be applied only to factors with 2 or more levels相关推荐

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