**TI82** TxtView file generated by CalcText - Kouriƒ tPST2tr˙Parametre - PST----------------------- Param - PST ----------------------- - Esperence Si < 0 - perte Si = 0 - equitable Si > 0 - gain E(x)= SOMME[pi*xi] - Ecart type avec xI = E(x) Sigm = RAC[SOM[pi*xi^2]-xI^2] - Variance Sigm^2 - Centrée moyenne = 0 X' = X - xI - Reduite Ecartype = 1 Y = X' / Sigm ˙QY