Using previous GFs as dimensions

If one wanted to make the ones you mention be treated similar, the way to do it would be to make the dimensions either:

<code>GF[i], (GF[i] - GF[i-1]), (GF[i-1] - GF[i-2]), (GF[i-2] - GF[i-3]), (GF[i-3] - GF[i-4])</code>

or perhaps:

<code>GF[i], (GF[i] - GF[i-1]), (GF[i] - GF[i-2]), (GF[i] - GF[i-3]), (GF[i] - GF[i-4])</code>

(where index 'i' is the most recent wave, 'i-1' is the second most recent wave, etc)

Of course, whether that would give better results than all independantly I have no idea about... and which of those ways of making it relative would be better I'm not sure about either.