Got it, arms raised in triumph, LOL! Although I still couldn't pick an integral or a polynomial out of a line-up, all I had to do was plug the values into the formula(s) you gave me. Thank-you!
Luck, Sebastian --- In [email protected], "treliff" <[EMAIL PROTECTED]> wrote: > > You're welcome. Rest assured I didn't figure out the numbers myself :) > > Essence is that NORMSDIST is an integral that cannot be coded in AB. > HAS is a polynomial that does a very good approximation. > > A while ago I submitted to TJ suggestion to include NORMSDIST and > NORMSINV (its inverse) as native AB functions. These are essential > functions for any statistical approach. > > I don't know how Tomasz would code 'm, but in any case it would speed > up things, I assume. So far no luck. > > So Sebastian, or anyone using these functions, feel free to endorse > this effort by submitting a similar request at the feedback center. > > http://www.amibroker.com/feedback/ > > Thanks :) > > -treliff > > --- In [email protected], "sebastiandanconia" > sebastiandanconia@ wrote: > > > > > > A sincere thank-you for the response, I know it's a pretty arcane > > subject. This is the nearly unintelligible math part I was talking > > about when I said in a subsequent post that I didn't realize how > much I > > was asking for, LOL! I don't understand this enough to apply it to > > what I want to do. I assume it's just a formula where I plug in the > > values, but the "where", "how" and "why" plumb evade me.:) I'll > work > > on it, though. > > > > > > > > Luck > > > > Sebastian > > > > > > > > --- In [email protected], "treliff" <treliff@> wrote: > > > > > > Sebastian, > > > > > > The HAS function below (based on Hasting's polynomial > approximation) > > > gives 7-decimal accuracy of NORMSDIST. > > > > > > function t(x) > > > { return 1 / (1+0.2316419*x); } > > > > > > function HAS(x) > > > { return 1 - (exp(-0.5*x^2)/sqrt(2*3.141592654))*(0.31938153*t(x)- > > > 0.356563782*t(x)^2+1.781477937*t(x)^3-1.821255978*t(x) > > > ^4+1.330274429*t(x)^5); } > > > > > > -treliff > > > > > > > > > --- In [email protected], "sebastiandanconia" > > > sebastiandanconia@ wrote: > > > > > > > > > > > > I came across what I consider to be a valuable stock > market/economic > > > > indicator, the Wright Model "B" yield-curve indicator. Using > this > > > > formula in Excel: > > > > > > > > > > > > Probability = NORMSDIST(-2.17 - 0.76 x S + 0.35 x R) > > > > > > > > where "S" is the spread (10-Year Treasury yield minus 3-month T- > Bill > > > > yield) and "R" is the Fed Funds rate, it gives the probability > of > > > > economic recession within the next 4 quarters. (Only about 44% > > > right > > > > now, so there's some good news. I envision using this as a > market- > > > exit > > > > indicator, warning when conditions are about to turn really > ugly for > > > > both the stock market and the economy. ) > > > > > > > > This formula: > > > > > > > > > > > > Z(x) = (1/(sqrt(2*pi()))*exp(-x^2/2)) > > > > > > > > appears to be the actual math represented by the NORMSDIST > > > function. I > > > > believe AB supports all the operations in this formula. > > > > > > > > My problem is that I'm not math-savvy enough to make the leap > from > > > here > > > > to turn this into a complete AB formula. I don't know what > > > operation > > > > the NORMSDIST formula performs on the Wright Model part, I don't > > > know > > > > what the "x" variable is supposed to be...there's no end to > what I > > > don't > > > > know.:) > > > > > > > > Any help from my superiors in the math field (undoubtedly a VERY > > > large > > > > club) would be greatly appreciated. > > > > > > > > > > > > > > > > Luck to all, > > > > > > > > Sebastian > > > > > > > > > >
