There are over 60 variables in the dataset, so it would be exhaustive to try and create these as examples in a data step. However, I may have already come across a solution (or at least identified a limitation). It seems that the issue was caused by having only 1 variable under the "across" variable (in this case, the variable "FF", with only "AERATE" under it). For regular display, this is not an issue however, it seems that this is an issue if you are trying to include these variables within a compute block for traffic lighting purposes. To remedy this, I created a dummy variable containing just blanks, and included it in the definition under the across (so now the AERATE and this dummy variable are both under "FF"). Then, I just define this dummy variable as a "display noprint", so it does not generate a column in the output. Once I do that, everything seemed to work fine. Not sure what the underlying mechanism is that causes this to be the case, but apparently trying to format through a compute block on a variable that is the only variable under an across variable causes the data values to disappear in the output. Once you include another variable under that across variable, everything works as expected.
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