MetaStock -> Tools -> Indicator Builder -> New Copy and paste formula below. =================== True Strength Index =================== ---8<--------------------------- { http://www.metastocktools.com } pdsRoc:=Input("ROC periods",1,252,3); pdsEma:=Input("EMA periods",1,252,5); smooth:=Input("smoothing EMA periods",1,252,8); display:=Input("plot TSI=1, +/- slope signals=2",1,2,1); TSI:=100* Mov(Mov(ROC(C,pdsRoc,%),pdsEma,E),smooth,E)/ Mov(Mov(Abs(ROC(C,pdsRoc,%)),pdsEma,E),smooth,E); SlopeSig:= If(TSI>Ref(TSI,-1),1,If(TSI