Altair RISE

A program to recognize and reward our most engaged community members

Nominate Yourself Now!

Logistic Regression - how confidence is computed

Hi everyone!

I have a question regarding rapidminer and i hope somebody can help me please : )

I've created a Workflow based on the Weka-Logistic Regression. How the coefficents are calcuated and so on is not the problem.
Furthermore I built the Workflow so, in the end it created a csv file which applies the model on my input.csv.

Now I got the confidence of yes and no, which is the probability of course (I hope so).
I was little bit skeptic so i computed the coefficients for one row of data and i got a prob which deviates from the computed prob by rapidminer.
I was wondering, if its possible or to track how Rapdiminer computes the confidence for the data?

With kind regards
Klori

Find more posts tagged with

AI Studio

Performance

Regression

Accepted answers

All comments

earmijo

Upload a dataset showing the problem.

Confidences are calculated:

p = exp( X*beta ) / ( 1 + exp(X*beta) ) ,

1-p = 1/ ( 1 + exp(X*beta) )

The labels might be reversed ( the model might have been run for the 'No' class instead than the 'Yes' class.

klori

Hi earmijo : )

Thanks for your help, but what I would like to know, if i can see how it calculates it?
For example, i see which coeffiecents it takes to calc the p?

One example, the coefficients are for yes:

score_1 -> (null)
score_2 -> -0,8628
age-> -0,2192
day -> -0,0423
time -> 0,0923
gender -> 0,3161 (binomial)
segment -> 0,6009
payment -> -0,078 (binomial)
telefon -> 0,2288 (binomial)
Constant -> -3,5047

confidence(yes) -> 1,42%
confidence(no) -> 98,58%

I was testing around and set telefon to 0, gender to 0 and I come to 1,77% yes
And if i take every coefficient it gives me 3,02%

I would very much appreciate the way to see how rpaidminer takes the coefficients and compute the p.
Thanks for your help earmijo

Kind regards,
Klori

ps: Because i am using W-Lgistic i want to see the Weka result via rapidminer. Even thpugh it says "Creating weka_result, please wait..." it seems it doesnt load.
Is this normal? Do i need to install something extra or so?