Exactly. That's about as selective as you can get.<p>No way of saying that hockey stick will appear if he includes all the data but the way he filtered out the end part and then stretched it is just being very selective with the data provided.<p>The reason why there is so much room for interpretation in all this data crunching in part is because of the troublesome normalization issues faced when consolidating data from so many different sources.<p>If there had been reliable weather stations in the last two millennia this would be completely different. But obviously that's not the case.