About chemicalab

chemicalab · ‎11-18-2014

aha ok, sure that makes sense, thank you very much for the reply and example it was really helpful, by the way you wouldnt happen to have any good example on creating the KS chart in excel?

chemicalab · ‎11-18-2014

meaning an id with ref 1 for age and 0 for gender what predicted probability will it get?

chemicalab · ‎11-18-2014

ok so how can an id which falls into that bin get a probability then?

chemicalab · ‎11-18-2014

Hi all, One question, when i run a logistic regression with a binned variable (age in 3 categories) and i use the 1st group as reference group, which beta estimate does it get? because i get an estimate for the other two groups but not for that one or am I mistaken? The reason i am asking cause i would like to have the according estimates so as to calculate the probability myself but i will be missing out on cases where the id falls into the 1st bin. Regards,

chemicalab · ‎08-08-2014

use the betas derived , multiply with the factor loadings across till n and then divide with the standard deviation to reverse the standardize coeffs , then you get the contribution back by dividing with the rsquare of each component * 100, downside is t significance

chemicalab · ‎08-08-2014

I will try PLS and see if that satisfies my result, thank you so much everybody for your input, i tried though using pca and managed to revert back the coefficients in order to show variable contribution

chemicalab · ‎08-08-2014

Hi , How would i proceed if due to multicollinearity between variables i was to use pca, derive some components, use them to run the model, how would i be able to reverse the coefficients in order to get the true effect of the variables in the model? Thank you in advance

chemicalab · ‎07-24-2014

Hi all, Any good paper that could explain the background and application of SVM in SAS Base or anything?

chemicalab · ‎05-29-2014

Well i dont understand much of its background source code, i liked the animation on it how the slider moves and the clusters get coloured, dont know if there is any contact link either

chemicalab · ‎05-28-2014

Hi all, Any suggestions on how a dendrogram with colours like the one in the link below Cluster Analysis - The Agglomerative Method in SAS and under inspect where the dendrogram is plotted can be created? i mean with moving colours as the bar comes along Kind regards

chemicalab · ‎05-09-2014

Realised that i can do the computations by myself using the out roc, thank you for the information though

chemicalab · ‎05-07-2014

Hi, I am running a logistic regression model in SAS base and while i am able to obtain a CTABLE for the training set , I cant seem to find how i will get it when scoring the validation set for the validation set What is missing int he below code so i can obtain the CTABLE for the validation set and see where the optimal cut off point is? PROC LOGISTIC INMODEL=MODELPARAMETERSTRAINING ; SCORE DATA=VALIDATION OUT= VALID_SCORED OUTROC=ROC_VAL ROCEPS=0.1 ; RUN; Regards

chemicalab · ‎05-07-2014

I have tried the following : proc freq data=OUTPUT.POPULATION (THE SET WITH 95% nonevents and 5% events) noprint; table TARGET / out=priors(drop=percent rename=(count=_prior_)); run; and i try to score it with the parameters based on the training set: PROC LOGISTIC INMODEL=MODELPARAMETERSTRAINING (the 50-50 sample) ; SCORE DATA=OUTPUT.POPULATION PRIOR=PRIORS OUTROC=ROC OUT=SCORESPOP PREDICTED=ESTPROB ; RUN; Would that be the correct syntax? I am wondering cause when i compare the estimated probabilities of scoring with or without the priors i see a huge difference in p_1

chemicalab · ‎05-06-2014

Thank you for your clarifications

chemicalab · ‎05-06-2014

Aha ok i misread since i am adjusting intercept I am good to go, so for scoring the validation which is also of a 50-50 analogy i dont need to adjust, that would be only for the population scoring where the true rates of events and non events is depicted

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