The code uses the ifelse function to apply a condition to a set of data. The condition is that if the value in the “Variability” column is equal to “Single” and the value in the “Duration” column is greater than 625, then the duration should be decreased by 20.

However, there are a few issues with this code:

• The ifelse function takes three arguments: the condition, the first value if the condition is true, and the second value if the condition is false. In this case, the order of these values is incorrect.
• The code uses an & symbol to represent the logical “and”. However, in most programming languages, including R, the correct symbol for logical “and” is &.
• The variable name option1$Surgical seems unusual. It would be more typical to use a different name.

Here’s how you might rewrite this code:

option1$Surgical <- ifelse((option1$Variability == "Single") & (option1$Duration > 625), 
                         option1$Duration - 20, option1$Duration)

Alternatively, since the duration is always decreased by at least 20 in this case, you could simply write:

option1$Surgical <- ifelse(option1$Variability == "Single", option1$Duration - 20, option1$Duration)

However, depending on the context of this variable, using 0 might be more typical than -20. Here’s how you could do that:

option1$Surgical <- ifelse(option1$Variability == "Single", option1$Duration - 20, 0)

This will ensure that if there are no cases where the duration is greater than 625 and the variability is “single”, option1$Surgical will be 0 instead of NA.

Last modified on 2024-06-23