text_combined: comments hi vince sorry missed paris many thanks comments incorporated sent eprm things crazy moment hopefully calm couple weeks time catch better best regards chris original message cc sent sunday october 15 2000 11 06 subject comments julie sorry delay comments vince sorry long delay responding comments focused third article till time make modifications 1 second article would mention formulation mean reversion process represents one several possible equations capture type market evolution prices time 2 one comment applies articles problem one defines time series energy prices numbers used australian nsw pool prices seem correspond chronological prices one alternative approach build different time series corresponding time intervals day would result different price behavior estimates jump choice one convenience depends actual problem investigation one could argue volumes electricity traded different time slots represent different economic commodities figure 3 jump frequency units vertical axis require explanation talking expected number jumps total number half hourly periods year goes f table 2 article number 3