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Reverse coding in R refers to the process of changing the coding of a variable from a positive to a negative scale, or vice versa. This is often done in research studies to avoid response bias or to create a more balanced scale. In order to perform reverse coding in R, one can use the “reverse.code” function from the “psych” package. This function takes in a variable and reverses its coding, generating a new variable with the reversed scores. For example, if a variable has scores ranging from 1 to 5, the “reverse.code” function will change them to 5 to 1. This allows researchers to easily perform reverse coding in a systematic and efficient way.
Perform Reverse Coding in R (With Example)
When creating surveys, researchers sometimes rephrase “positive” questions in a “negative” way to make sure that individuals are giving consistent responses.
We say that these types of questions are reverse-coded.
When using a survey to assign a composite score to individuals, it’s important to make sure the reverse-coded questions are reverse-scored as well.
The following example shows how to reverse the scores on reverse-coded questions in R.
Example: Reverse Coding in R
Suppose researchers administer a survey with 5 questions to 10 individuals in which the possible responses to each questions are:
- Strongly Agree
- Agree
- Neither Agree Nor Disagree
- Disagree
- Strongly Disagree
The following data frame contains the results of the survey in which “Strongly Agree” is assigned a value of 5, “Agree” is assigned a value of 4, and so on:
#create data frame that contains survey results df <- data.frame(Q1=c(5, 4, 4, 5, 4, 3, 2, 1, 2, 1), Q2=c(1, 2, 2, 1, 2, 3, 4, 5, 4, 5), Q3=c(4, 4, 4, 5, 4, 3, 2, 4, 3, 1), Q4=c(3, 4, 2, 2, 1, 2, 5, 4, 3, 2), Q5=c(2, 2, 3, 2, 3, 1, 4, 5, 3, 4)) #view data frame df Q1 Q2 Q3 Q4 Q5 1 5 1 4 3 2 2 4 2 4 4 2 3 4 2 4 2 3 4 5 1 5 2 2 5 4 2 4 1 3 6 3 3 3 2 1 7 2 4 2 5 4 8 1 5 4 4 5 9 2 4 3 3 3 10 1 5 1 2 4
Suppose questions 2 and 5 are reverse coded, so we must reverse their scores.
That is:
- 1 should become 5.
- 2 should become 4.
- 3 should become 3.
- 4 should become 2.
- 5 should become 1.
The easiest way to do this is to take the max possible score (5) and add 1 to get 6. Then subtract the original scores from 6 to get the reverse scored value.
For example:
- 5 becomes: 6 – 5 = 1.
- 4 becomes: 6 – 4 = 2.
- 3 becomes: 6 – 3 = 3.
- 2 becomes: 6 – 2 = 4.
- 1 becomes: 6 – 1 = 5.
We can use the following code to do this in R:
#define columns to reverse code reverse_cols = c("Q2", "Q5") #reverse code Q2 and Q5 columns df[ , reverse_cols] = 6 - df[ , reverse_cols] #view updated data frame df Q1 Q2 Q3 Q4 Q5 1 5 5 4 3 4 2 4 4 4 4 4 3 4 4 4 2 3 4 5 5 5 2 4 5 4 4 4 1 3 6 3 3 3 2 5 7 2 2 2 5 2 8 1 1 4 4 1 9 2 2 3 3 3 10 1 1 1 2 2
Cite this article
stats writer (2024). How can reverse coding be performed in R, and do you have an example?. PSYCHOLOGICAL SCALES. Retrieved from https://scales.arabpsychology.com/stats/how-can-reverse-coding-be-performed-in-r-and-do-you-have-an-example/
stats writer. "How can reverse coding be performed in R, and do you have an example?." PSYCHOLOGICAL SCALES, 27 Jun. 2024, https://scales.arabpsychology.com/stats/how-can-reverse-coding-be-performed-in-r-and-do-you-have-an-example/.
stats writer. "How can reverse coding be performed in R, and do you have an example?." PSYCHOLOGICAL SCALES, 2024. https://scales.arabpsychology.com/stats/how-can-reverse-coding-be-performed-in-r-and-do-you-have-an-example/.
stats writer (2024) 'How can reverse coding be performed in R, and do you have an example?', PSYCHOLOGICAL SCALES. Available at: https://scales.arabpsychology.com/stats/how-can-reverse-coding-be-performed-in-r-and-do-you-have-an-example/.
[1] stats writer, "How can reverse coding be performed in R, and do you have an example?," PSYCHOLOGICAL SCALES, vol. X, no. Y, ص Z-Z, June, 2024.
stats writer. How can reverse coding be performed in R, and do you have an example?. PSYCHOLOGICAL SCALES. 2024;vol(issue):pages.