Changing factor levels using for loop in R

@bhaskarjit wrote:

my dataset has 60 variables, each variables has ordinal value with 5 levels (Agree, Disagree, Neutral, Strongly Agree, Strongly Disagree), but it is showing 6 levels with addition of level " ".

str(shopping$Felt_Unhappy)
Factor w/ 6 levels "","Agree","Disagree",..: 3 4 2 3 4 3 4 2 3 2 ...

I want to remove that unnecessary level from all the columns. I am using the code

for (i in colnames(shopping[,11:60])){
    shopping$i <- factor(shopping$i)
}

after executing the above code I am getting the following error

 Error in `$<-.data.frame`(`*tmp*`, "i", value = integer(0)) :
 replacement has 0 rows, data has 162

How to do this? Please help

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