Hi there
I have tried to hunt for an answer and I'm still stuck, so thought I'd ask.

1. I have a survey where we have two numerical questions (e.g. how many males have you had sex with). These are BW01 and BW01a.

2. Then we have created a new, hidden variable (type: equation), where we have tried to create a value that is the sum of those two numerical questions. The formula we are using for this is =sum(BW01,BW01a)

3. For a later question, we want to do data checking by ensuring that the maximum value allowed for a subsequent numerical input question is equal to the result of that formula question

but it doesn't work!

I know that the error could be in one or both of those steps but I can't find out where to test if the formula in step 2 is correct/incorrect or if it is in the subsequent step!

So, any advice would be *greatly* appreciated!!

For testing purposes, leave your equation question(s) visible so you can see the generated results.

are you using the equal character "=" in your equation?

Yeah, good catch holch. You do not need the equals operator to return the value of that sum. Simply: