Prace s prirustky misto urovnovych hodnot zvysuje sanci, ze pracujeme se stacionarnimi casovymi radami, navic do konecneho vztahu vstupuji pouze pozorovatelne aktualni hodnoty [C.sub.t] a [Y.sub.t].
Sanci, Sawyer, Weller, Bond, and Patton (2004) as well as Halse and Honey (2005) consider that 14-year-olds have sufficient cognitive capacity to provide informed consent for a research project.
Ani jedno ze zachycenych zvirat ale nema realnou sanci jakkoliv ovlivnit to, jak velke tyto vnejsi vstupy budou a napriklad kolik energie slunce do systemu doda.