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I am trying to write an equation such that the answer depends on the value of the variable missing if the value of missing is 0 -- then increment needs to be 3 if missing is 1 - increment 2 if missing is 2 - increment 1

any ideas on how i can do this?

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    missing $+$ increment $=3$, maybe? – 2017-02-17

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If I understand correctly, you need an equation for relate the quantities missing and increment based only in those three 'rules'. To do this, you can plot the points in a plane by taking missing as the $x$ axis and increment as the $y$ axis, and then interpolate the points by a polynomial. enter image description here As in @астон вілла олоф мэллбэрг comment, the simplest relation is the linear equation increment$=3-$missing.