Hiding a trigger action

As part of a calculator, the learner enters 3 variables, then clicks the "calculate" button.

All of the math for the calculator is built into the button. The calculator works, but it changes the display of one of the entries based on the first trigger. Is there anyway that I can not display the action of that trigger but still apply the answer to the rest of the calculation? Ultimately, I'm trying to get the calculator to do the following:

stain index = (positive population median - negative population median) / 2 x negative population rSD

I could be going about this completely wrong, so any feedback is welcome.

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