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Asked: 2026-05-28T17:45:15+00:00

I would like to do a simple if statement to group codes into groups.

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I would like to do a simple if statement to group codes into groups. The variable has number codes and I would like to create a new variable that groups several number codes together. I have written the following if statement but because they are many code numbers (30 codes), I need help writing a more elegant code to group the variable rather than writing 30+ if statements.

Data2$RevisedSIC.Group <-c()
for (i in 1:length(Data2$SIC.Group )) {
if (Data2$SIC.Group[i] =="10110") Data2$RevisedSIC.Group [i]="Metal" else 
if (Data2$SIC.Group[i] =="10410") Data2$RevisedSIC.Group [i]="Metal" else
if (Data2$SIC.Group[i] =="10439") Data2$RevisedSIC.Group [i]="Metal" else
if (Data2$SIC.Group[i] =="14111") Data2$RevisedSIC.Group [i]="Stone" else
if (Data2$SIC.Group[i] =="10421") Data2$RevisedSIC.Group [i]="Stone" }
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1 Answer

  1. Editorial Team

    There is no need for a loop

    Data2 <-data.frame(rep(c(10110,10410,10439,14111),2))
colnames(Data2) <-"SIC.Group"

Data2$RevisedSIC.Group[Data2$SIC.Group %in% c(10110,10410,10439)] <- "Metal"
Data2$RevisedSIC.Group[Data2$SIC.Group %in% 14111] <- "Stone"

  SIC.Group RevisedSIC.Group
1     10110            Metal
2     10410            Metal
3     10439            Metal
4     14111            Stone
5     10110            Metal
6     10410            Metal
7     10439            Metal
8     14111            Stone
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