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I have a dataset with multiple variables and a factor variable that has the name of the segment like Seg1, Seg2, Seg3, etc.

The names of the segments are unique and there is a total of 11 segments and I would like to drop the records of a few segments.

Since this is a factor variable, how do I drop the records that meet the criteria. The levels I want to drop are 1,2,5,6,7. Please help me in how do I drop the rows where the segments are of these levels.

Aradhya Mudigonda
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  • It would be easier to help if you create a small reproducible example along with expected output. Read about [how to give a reproducible example](http://stackoverflow.com/questions/5963269). – Ronak Shah Jun 21 '21 at 10:16

2 Answers2

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df[as.numeric(df$var) %in% c(1,2,5,6,7), ]
yogevmh
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  • While this code snippet may solve the question, [including an explanation](http://meta.stackexchange.com/questions/114762/explaining-entirely-code-based-answers) really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. – Gerhard Jun 22 '21 at 08:06
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Since you didn't provide data, but described you data in a way that was understandable I will provide a general answer.

# Generate a factor variable
# to provide an example.
mtcars <- mtcars %>% 
        mutate(
                cyl_factor = as.factor(
                        paste(cyl, "cyl")
                )
        )

I would convert the factor to character in this process, to avoid dealing with missing levels, so

# Convert factor to character, to 
# avoid factor levels confusions. And 
# filter accordingly.
mtcars <- mtcars %>% 
        mutate(
                cyl_factor = as.character(
                        cyl_factor
                )
        ) %>% filter(
                !(cyl_factor %in% c("6 cyl", "4 cyl"))
        )

Where c("6 cyl", "4 cyl") will be the levels of the factors that you want to exclude from your data.

NOTE: Please see How to make a great R reproducible example and https://stackoverflow.com/help/how-to-ask for future posts here on Stackoverflow, please.

Serkan
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