Statistical Procedures

Programming the statistical procedures from SAS
BookmarkSubscribeRSS Feed
Marianne
Calcite | Level 5

I have received the following output in Proc Logistic:

VariableDFEstimateStdErrWaldChiSqProbChiSqStandardizedEst
Intercept1-0.17440.23160.56710.4514_
Var111.75370.297734.7055<.00010.0772
Var210.02620.0039344.3659<.00010.0792
Var31-0.46270.077335.8634<.0001-0.0813
Var41-0.32090.04942.8821<.0001-0.0884
Var51-0.001910.00020686.6722<.0001-0.1216
Var61-0.73360.111743.1698<.0001-0.1282
Var71-0.94590.163233.5811<.0001-0.057

How do I convert it into scoring formula?

I tried a formula based on the Estimate column:
-0.1744+1.7537*Var1+0.0262*Var2-0.4627*Var3 etc.. However, the result I am getting does not match the Score if I were to score using Proc Logistic (Proc Logistic Inmodel=a.Model)

I need to be able to create the score produced using Inmodel statement, but using linear function Intercept+XVar1+YVar2... Which info from the output I should be using and what is the transformation (if any) required?

Thank you!

1 REPLY 1
PGStats
Opal | Level 21

What you get with your expression F = intercept + Var1*b1 + ... is Logit(p) = Ln(p/(1-p)). You want to estimate p = exp(F)/(1+exp(F)) = 1 / (1+exp(-F)).

PG

PG

sas-innovate-white.png

Our biggest data and AI event of the year.

Don’t miss the livestream kicking off May 7. It’s free. It’s easy. And it’s the best seat in the house.

Join us virtually with our complimentary SAS Innovate Digital Pass. Watch live or on-demand in multiple languages, with translations available to help you get the most out of every session.

 

Register now!

What is ANOVA?

ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.

Find more tutorials on the SAS Users YouTube channel.

Discussion stats
  • 1 reply
  • 2667 views
  • 0 likes
  • 2 in conversation