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Raghu Chittari
  • Hyderabad,Andhra Pradesh
  • India
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Raghu Chittari's Discussions

Queries : Random Forests

Started Jul 12, 2016 0 Replies

Hello All,I am building random forest on employee churn data where %events(churns) is 8%.Is there any upper cutoff on the number of trees  I mention in the RF command?Which accuracy metric should I…Continue

Market Mix Models : Confidence in coefficients

Started Jun 19, 2016 0 Replies

In market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration and (b12, b22, b32, b42 ) be the coefficients in the second…Continue

Tags: effects, model, random, attribution, mixed

How to Define ordinal variables in SAS?

Started this discussion. Last reply by Raghu Chittari Feb 13, 2016. 2 Replies

Hello All,I need help in defining ordinal variables in SAS. I have age buckets given for each person. Say 26 Years-30 years as bucket 1, 31 years to 35 years as bucket 2, 36 years to 40 years as…Continue

Tags: SAS, Variables, Ordinal

Queries in modeling

Started Dec 29, 2015 0 Replies

Hi all,I am from engineering background. I would require your help in certain modeling concepts. Your help would be greatly appreciated!Following are my few questions...If a variable which is…Continue

Tags: P-Value, Regression, Logistic, Modeling, Statistical

 

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Raghu Chittari's 2 discussions were featured
Sep 5, 2016
Raghu Chittari posted a discussion

Market Mix Models : Confidence in coefficients

In market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration and (b12, b22, b32, b42 ) be the coefficients in the second iteration. I check the validity of the model based on some general guidelines:(i)b1--b4 should be positive and significant (ii)Adstocking uses reasonable lags(Eg: TV has high lag of more than 60%) (ii)sales contributions should not vary much from last year provided corresponding spends remain same…See More
Jun 24, 2016
Raghu Chittari replied to Raghu Chittari's discussion How to Define ordinal variables in SAS?
"Hello Arun, Thanks a lot for the response! I do not have the exact age values. I am given the age bucket for each person. And as you suggested, I have created the buckets 1,2,3,4,5,etc. So according to you, I can use these bucket numbers directly.…"
Feb 13, 2016
Arun replied to Raghu Chittari's discussion How to Define ordinal variables in SAS?
"Hey Raghu, I got your DM and responding here. I'm not sure what you're looking for here. Do you have age as a continuous variable - like 25, 26 ... 70? If you want to group them into buckets, you could quickly use any grouping algorithm to…"
Feb 13, 2016
Raghu Chittari posted a discussion

How to Define ordinal variables in SAS?

Hello All,I need help in defining ordinal variables in SAS. I have age buckets given for each person. Say 26 Years-30 years as bucket 1, 31 years to 35 years as bucket 2, 36 years to 40 years as bucket 3, and so on. If I include these bucket numbers in the model, then SAS considers it as continuous numeric variable. I want to make SAS understand that these buckets are ordinal. I did not get any useful information regarding this online. Can you please help me out.Thanks a lot in advance…See More
Feb 12, 2016
Raghu Chittari posted a discussion

Queries in modeling

Hi all,I am from engineering background. I would require your help in certain modeling concepts. Your help would be greatly appreciated!Following are my few questions...If a variable which is important from business standpoint has a p-value of 0.5, then should it be considered in the model? If Yes, then wouldn't it make the model coefficients unstable?Should I standardize the variables before building a logistic regression model? If Yes, is there a commonly followed approach?I am planning to…See More
Dec 29, 2015

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