Pair Trade Update

Just checking how the "pair trade" is working out. The concept was fine but if I think of just NCT and IYR in isolation I shorted too much IYR. So far I lost $251 on IYR and gained $259 on NCT. My IYR short position is worth -$8228 and my long NCT $3229. I should have shorted fewer IYR and if I had the trade would be nicely profitable despite the fact that IYR rose. NCT has turned out to be much stronger than the average actual property owning REIT.