Calculate van der Eijk's measure of agreement A
Calculate agreement in ordered rating scales. This function implements van der Eijk's (2001) measure of agreement A, which can be used to describe agreement or consensus among respondents.
agreement(V, old = FALSE)
V |
A frequency vector |
old |
Optional argument if you wish to use the deprecated algorithm for agreement A, as outlined in van der Eijk's article. There is normally no reason to set the |
This is the main function to calculate agreement. A frequency vector describes the number of observations in a given category. For example, the vector [10,20,30,15,4] describes 10 observations with position 1, 20 observations with position 2, 30 observations with position 3, 15 observations with position 4, and 4 observations with position 5. At least three categories are required to calculate agreement.
Polarization can be measured by extension. A convenience function polarization is provided.
The function returns the measure of agreement A. A is 1 if there is perfect unimodality (=agreement); A is 0 if there is perfect uniformity; A is -1 if there is perfect bimodality (=lack of agreement)
Didier Ruedin
van der Eijk, C. 2001. Measuring agreement in ordered rating scales. Quality and Quantity 35(3):325-341. <DOI: 10.1023/A:1010374114305>
# Sample data V <- c(30,40,210,130,530,50,10) # Calculate agreement A agreement(V) # The rate of agreement is given as 0.6113333
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