StR1,

Look again, MDI is there as well as PDI and ADX. But if u really want a formula here it is:

perd:=Input("Periods -DI",2,200,20);

DMDn:= If(L<Ref(L,-1) AND H<Ref(H,-1),Ref(L,-1)-L,If(L<Ref(L,-1) AND H>Ref(H,-1),If(Ref(L,-1)-L>H-Ref(H,-1),Ref(L,-1)-L,0),0));

TR1:= Max(H-L,H-Ref(C,-1)); {day true range}
TR:=If(TR1>Ref(C,-1)-L,TR1,Ref(C,-1)-L);

AvgDMDn:=Mov(DMDn,perd,E);
AvgTR:=Mov(TR,perd,E);

DIminus:=AvgDMDn/AvgTR*100;

DIminus

Cheers

msst,

i know but that was exactly what i wanted to change. As u know, i am sure of that, all indicators made by Welles Wilder and availiable in metastock use an old way to smooth the data and that because in 1970 personal computers were, well, lets say not availiiable for any pocket so i do preffer smoothing with a exponential moving average or even simple moving average. But i am sure that u are very well aware of that...

;)