How do I convert a factor into date format?
You were close. format= needs to be added to the as.Date call:
r
Error in eval(expr, envir, enclos) : object not found
Don’t know why @Janos deleted his answer, but it’s correct: your data frame Train doesn’t have a column named pre. When you pass a formula and a data frame to a model-fitting function, the names in the formula have to refer to columns in the data frame. Your Train has columns called residual.sugar, total.sulfur, alcohol and quality. You need to change either your formula or … Read more
dplyr: “Error in n(): function should not be called directly”
I presume you have dplyr and plyr loaded in the same session. dplyr is not plyr. ddply is not a function in the dplyr package. Both dplyr and plyr have the functions summarise/summarize. Look at the results of conflicts() to see masked objects.
How can I convert Json to data frame in R
Try using jsonlite library. It work for me Following is output if you want list.
“non-numeric argument to binary operator” error in R
I’ve been trying to run this function and the “non-numeric argument to binary operator” pops up. I’ve seen quite a few questions similar to mine, yet I still can’t figure out what is the issue with my code. The error happens on the sixth line Itl[j] <- (Itl[j] + incrm[j]) %% N. The code for the … Read more
How to remove outliers from a dataset
Use outline = FALSE as an option when you do the boxplot (read the help!).
Error: attempt to use zero-length variable name
I’ve posted an issue on dplyr github page. I can reproduce the results using the code below. It has to do with whether the csv contains a column of rownames without a header. read_csv and read.csv handle this differently, thus producing differing results with filter. First the case when it works write_csv to read_csv or read.csv; both work fine with filter Now for when it fails … Read more
R – longer object length is not a multiple of shorter object length
Have a look at these lines here: What you see is that their lengths differ. How is this supposed to work? Think about what you are trying to do: You either need to evaluate the RMSE on the train data, or on the test data, but you are mixing them. That is, either this would … Read more
Logistic Regression on factor: Error in eval(family$initialize) : y values must be 0 <= y <= 1
Not able to fix the below error for the below logistic regression Few rows from the data i am using