
- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to deal with error “Error in eval(predvars, data, env) : numeric 'envir' arg not of length one” in R?
This error occurs when we do not pass the argument for independent variable as a data frame. The predict function will predict the value of the dependent variable for the provided values of the independent variable and we can also use the values of the independent variable using which the model is created.
Example
Consider the below data frame −
set.seed(1) x <-rnorm(20) y <-runif(20,5,10) df <-data.frame(x,y) df
Output
x y 1 -0.62645381 9.104731 2 0.18364332 8.235301 3 -0.83562861 8.914664 4 1.59528080 7.765182 5 0.32950777 7.648598 6 -0.82046838 8.946781 7 0.48742905 5.116656 8 0.73832471 7.386150 9 0.57578135 8.661569 10 -0.30538839 8.463658 11 1.51178117 7.388098 12 0.38984324 9.306047 13 -0.62124058 7.190486 14 -2.21469989 6.223986 15 1.12493092 5.353395 16 -0.04493361 5.497331 17 -0.01619026 6.581359 18 0.94383621 7.593171 19 0.82122120 8.310025 20 0.59390132 7.034151
Creating the linear model −
M <-lm(y~x,data=df)
Formula for prediction that results in error −
predict(M,newdata=df$x,interval="confidence") Error in eval(predvars, data, env) : numeric 'envir' arg not of length one
Formula for prediction that does not result in error −
predict(M,newdata=data.frame(df$x),interval="confidence")
Output
fit lwr upr 1 7.642084 6.814446 8.469722 2 7.536960 6.927195 8.146725 3 7.669228 6.738695 8.599762 4 7.353775 6.214584 8.492966 5 7.518031 6.900897 8.135166 6 7.667261 6.744547 8.589975 7 7.497538 6.854767 8.140310 8 7.464980 6.749018 8.180943 9 7.486073 6.821666 8.150480 10 7.600420 6.902430 8.298410 11 7.364611 6.273305 8.455917 12 7.510202 6.885355 8.135048 13 7.641408 6.816180 8.466635 14 7.848187 6.091378 9.604995 15 7.414811 6.530792 8.298831 16 7.566622 6.935903 8.197340 17 7.562892 6.936919 8.188865 18 7.438312 6.639516 8.237107 19 7.454223 6.706932 8.201514 20 7.483722 6.814287 8.153156
We can simply use the Model object as well, if we want to predict the dependent variable for the independent variable
Example
predict(M)
Output
1 2 3 4 5 6 7 8 7.642084 7.536960 7.669228 7.353775 7.518031 7.667261 7.497538 7.464980 9 10 11 12 13 14 15 16 7.486073 7.600420 7.364611 7.510202 7.641408 7.848187 7.414811 7.566622 17 18 19 20 7.562892 7.438312 7.454223 7.483722
Example
predict(M,interval="confidence")
Output
fit lwr upr 1 7.642084 6.814446 8.469722 2 7.536960 6.927195 8.146725 3 7.669228 6.738695 8.599762 4 7.353775 6.214584 8.492966 5 7.518031 6.900897 8.135166 6 7.667261 6.744547 8.589975 7 7.497538 6.854767 8.140310 8 7.464980 6.749018 8.180943 9 7.486073 6.821666 8.150480 10 7.600420 6.902430 8.298410 11 7.364611 6.273305 8.455917 12 7.510202 6.885355 8.135048 13 7.641408 6.816180 8.466635 14 7.848187 6.091378 9.604995 15 7.414811 6.530792 8.298831 16 7.566622 6.935903 8.197340 17 7.562892 6.936919 8.188865 18 7.438312 6.639516 8.237107 19 7.454223 6.706932 8.201514 20 7.483722 6.814287 8.153156
- Related Questions & Answers
- How to deal with “could not find function” error in R?
- How to deal with the error “Error in int_abline---plot.new has not been called yet” in R?
- How to deal with error “undefined columns selected” while subsetting data in R?
- How to deal with error “undefined columns selected when subsetting data frame” in R?
- How to deal with hist.default, 'x' must be numeric in R?
- How to deal with error “$ operator is invalid for atomic vectors” in R?
- How to deal with error “Error in shapiro.test(…) : sample size must be between 3 and 5000” in R?
- How to deal with glm.fit error “NA/NaN/Inf” for logistic regression model in R?
- Explain 'Not a constructor function' error in JavaScript?
- How to deal with error 'height' must be a vector or a matrix while creating barplot?
- Getting Error message “Object doesn't support property or method 'attachEvent'” in IE11 to call SAP system
- How to deal with error “var(x) : Calling var(x) on a factor x is defunct.” in R?
- Resolve the MySQL error 'TYPE=MyISAM'?
- How to deal with error invalid xlim value in base R plot?
- Python: Can not understand why I am getting the error: Can not concatenate 'int' and 'str' object
Advertisements