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Lixzhang
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Hi Bill, Thank so much for pointing out the error and suggesting better R code. All pictures have been updated following your comment. FYI for the rest of readers, we originally had 30 + 300 = 300 in the two screenshots and they have been corrected. Bill's recommended R code replaced the "ugly" version of input$z <- input$x + input$y Thanks so much.
Thanks bijou4. For SAS users not familiar with R, you can install and load the package "dplyr" to use "%>%" as an operator in bijou4's example. In my case I avoided using 3rd party packages.
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Sep 12, 2016