Editing Forgetting curve (section)

==Equations ==
Many equations have since been proposed to approximate forgetting, perhaps the simplest being an exponential curve described by the equation<ref>{{cite journal|last1=Woźniak|first1=Piotr A.|last2=Gorzelańczyk|first2=Edward J.|last3=Murakowski|first3=Janusz A.|title=Two components of long-term memory|journal=Acta Neurobiologiae Experimentalis|year=1995|volume=55|issue=4|pages=301–305|doi=10.55782/ane-1995-1090 |pmid=8713361|url=http://www.ane.pl/pdf/5535.pdf |archive-url=https://web.archive.org/web/20100920055038/http://ane.pl/pdf/5535.pdf |archive-date=2010-09-20 |url-status=live}}</ref>

<math display="block">R = e^{-\frac{t}{S}},</math>

where <math>R</math> is retrievability (a measure of how easy it is to retrieve a piece of information from memory), <math>S</math> is stability of memory (determines how fast <math>R</math> falls over time in the absence of training, testing or other recall), and <math>t</math> is time.

Simple equations such as this one were not found to provide a good fit to the available data.<ref>{{cite journal |last1=Rubin |first1=David C. |last2=Hinton |first2=Sean |last3=Wenzel |first3=Amy |title=The precise time course of retention. |journal=Journal of Experimental Psychology: Learning, Memory, and Cognition |date=1999 |volume=25 |issue=5 |pages=1161–1176 |doi=10.1037/0278-7393.25.5.1161|hdl=10161/10146 |hdl-access=free }}</ref>