About ycenycute

ycenycute · ‎10-17-2021

In SAS EM decision tree node, what is the difference between running "train the node" under "Interactive" and directly running the decision node in the diagram workspace? The results do not seem match. Also, how to do pruning for decision tree? I tried changing Assessment measure from decision to misclassification, the results do not seem differ.

ycenycute · ‎10-13-2021

Do I need to change binary target to nominal target first? Or shall I directly pick gini index with nomial target?

ycenycute · ‎10-13-2021

In the decision tree node property panel, we can choose splitting rule for nomial target and ordinal target. I am wondering if my target is set to binary and I would like to use gini gain, shall I change nominal target to gini or ordinal target to gini?

ycenycute · ‎10-07-2021

Thanks.

ycenycute · ‎10-06-2021

I mean I manually create four dummy indicators for a categorical variable with 4 categories, then I drop one of the dummy indicator as the base level. But when I include the rest 3 dummy indicators in the model, how do those dummies work? By default, they are 1 for yes, 0 for no, but it seems to show the coefficient for 0. Are you suggesting I should set 1 for no and 0 for yes? If so, how shall I change that?

ycenycute · ‎10-06-2021

Got you. Thanks so much. Also wondering if I manually create dummy indicators for categorical variable, then I can choose to drop one dummy as the base level. Then when I include the rest dummy indicators in the model, the results show 0 behind the name of the dummy indicator. Does this mean the coefficient is for dummy _indicator = 0? This is quite counter-intuitive to me. How does SAS EM treat dummy indicators when running regression?

ycenycute · ‎10-05-2021

Thank you. Is there a way we can change this or choose the base level on our own?

ycenycute · ‎10-05-2021

In SAS EM, if you specify a variable as a nominal variable, then in the regression results, it will automatically drop one value as the base level. How can I check which value the software dropped after I run the analysis?

ycenycute · ‎10-03-2021

Yeah, the target is considered as interval instead of binary. Thanks.

ycenycute · ‎10-03-2021

In logistic regression in SAS EM, why does it give F statistics and R squared? Shouldn't it be Likelihood ratio (chi square) and pseudo-R squared? Also, should there be a classification table like in decision tree for a classification problem?

ycenycute · ‎09-23-2021

When I run variable selection, it shows error "SOLException Argument not found". Is there a way to help debug? What could be the issues? It seems that the problem is that the dataset does not exist as I try to look at the dataset, and it shows "the dataset does not exist". What could the reason for that? I am working on a project which was saved several days ago. I have no clue where to begin debugging.

ycenycute · ‎09-23-2021

When I use variable selection, it shows an error that "use at least one target variable". I go back to my dataset, and change the role of my dataset. Pick one of them as target variable. Re-run the data node, then go to variable selection node. But still, the error exists. Why is it?

ycenycute · ‎09-20-2021

Thanks for the reply. I understand the meaning of R square. I was asking how is R square calculated in the first step. In your manual, it includes three 2 steps (3 for binary target). So in the first step, is SAS running linear regression for each input on the output, and then pick those inputs whose R square is above the threshold?

ycenycute · ‎09-18-2021

In SAS Enterprise Miner, we can choose variable selection. Under variable selection, we have R square method. I checked this document, which is a good explanation of how R squared method works. I am wondering in the first step, how is R square calculated. Is it that run regression on the target variable using each input, then get the R square for each input variable?

ycenycute · ‎09-07-2021

Not really. I am talking about Task, then graph, then line plot or line plot wizard. There are two options, one is line plot, and the other line plot wizard. So what is the difference between the two?

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