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Larry's Friends

  • Bjarni Kristjansson
  • Ravirajan.K
  • Bhaswati Sengupta
  • Carolyn Griffin
  • Tomas Keller (formerly Ohlson)
  • Yi-Chun Tsai
  • Vincent Granville

Larry's Discussions

Optimizing steps in Gradient Descent. How is it done?

Started this discussion. Last reply by Larry Feb 24, 2010. 1 Reply

I found this method by a Netflix Prize participant on using "Aggressive Parametrization".  It seems like he is using optimization technique for the learning rates between iterations of a gradient…Continue

Operations Research blogger

Started Aug 28, 2009 0 Replies

Hi. I'm interested in joining this Operations Research community on Analytic Bridge. I am an Operations Research blogger myself. You can find my blog at…Continue


Larry's Page

Latest Activity

Larry replied to jadelim's discussion How to get R started in the group Data Mining
"Here is a list of R Helpful Links which includes a multitude of R tutorials."
Jul 6, 2012
Larry replied to Reality Check's discussion Interpreting Factor Loadings
"Factor loadings are a representation of the variation that is explained in your data.   Your initial data has patterns and noise.  When you create factor loadings the noise is still there but its explained now by the factor…"
Jan 4, 2012
Larry commented on Vincent Granville's blog post Analytic professionals: are we detailed-oriented or do we think "big picture", or both?
"I definitely look at myself as thinking about the "big picture" .  I think there are different types of analytics professionals.  I work on a team that has statistician modelers and BI analysts.  Both sets are analytics…"
Dec 21, 2011
Larry replied to Vincent Granville's discussion New book announcement: Data Science by Analyticbridge
"It definitely fits with the Analytic Bridge branding.  Yet to me both are appropriate."
Oct 24, 2011
Larry replied to Larry's discussion Dallas R Users Group looking for members and contributors in the group Texas Technical Professionals
"New website!  Please join at"
Oct 13, 2011
Larry commented on Jigsaw Academy's blog post Analytics Terminology
"I would like to offer another subset of Analytics   Prescriptive Analytics - "A set of mathematical techniques that computationally determine a set of high-value alternative actions or decisions given a complex set of objectives,…"
Sep 21, 2011
Larry commented on Vincent Granville's blog post Two great ideas to create a much better search engine
"That is an interesting idea and its got me to thinking.  Wouldn't it be great if the webmasters had control of how indexing is done on their website?  Perhaps a well thought out search engine could provide a api (javascript or such)…"
Sep 14, 2011
Larry replied to Name Withheld's discussion Ordinal level of measurement in data mining algorithms.
"I would imagine you could use the generalized linear model ie.  glm()  function to develop a predictor.  Of course you could use many non-linear methods such as rpart, bayesian inference, or neurel nets."
Aug 8, 2011
Larry replied to Larry's discussion Starting an R User Group in Dallas, TX in the group R-Project and Other Free Software Tools
"The Dallas RUG has updated its website offering with a Meetup site.   Please join via the Meetup site.  Looking forward to meeting all of the Dallas, Ft. Worth and North Texas R users."
Aug 8, 2011
Larry replied to Name Withheld's discussion Ordinal level of measurement in data mining algorithms.
"R does use ordered factors.  You can do it a couple of ways.  As the factor data type use factor(myvector, ordered=TRUE)  or you can use the ordered() function to convert an existing vector or factor.  I believe there are also R…"
Aug 8, 2011
Larry commented on Vincent Granville's blog post My favorite modern books (pictures of my bookcase)
"I've noticed that too about OReilly.  I've liked their programming books, especially on Python.  I was curious about their R books but haven't tried them yet."
Jun 28, 2011
Larry commented on Vincent Granville's blog post My favorite modern books (pictures of my bookcase)
"I didn't realize you had that much devoted into R.  Which R books do you recommend?"
Jun 27, 2011
Larry replied to Chetana Katpally's discussion A bidirectional Interface for R & Perl on Windows
"Without know what you've tried so far have you tried this one?  "
Jun 23, 2011
Larry replied to Michael Horn's discussion Tools: any thoughts on open source R vs. Rapid-I ?
"I can only speak to R.   Pros  - Thousands of add-on community generated packages that cover a wide range of applications  - Large community support base  - Reproducibility for peer review  - Documentation is well…"
Jun 21, 2011
Larry replied to Yashu Gupta's discussion Is there any Open Source Data Mining Tool for Creating Decision Trees ?
"R has packages for creating decision trees.  The most notable one is rpart.  For a variety of add-on packages that R can use for data mining, including decision trees, look at the Machine Learning task views…"
May 4, 2011
Larry replied to Vincent Granville's discussion Why R is better than Excel for teaching statistics in the group R-Packages (Statistical Computing)
"Wikipedia on Comparison of Statistical Packages."
Apr 25, 2011

Profile Information

Short Bio:
Experienced Industrial, Manufacturing, and Operations Engineer for 12 years. Masters in Operations Research. Active member and local chapter officer of INFORMS. Licensed professional Engineer. Enjoy using my time to share experiences, tools, and computer software with peers in the field of Industrial Engineering and Operations Research.

Organizer of the Dallas R Users group.

My analytics website
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Field of Expertise:
Business Analytics, Predictive Modeling, Data Mining, Operations Research, Statistical Programming, Statistical Consulting, Industrial Statistics
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Larry's Blog

Midwest ISO wins 2011 Edelman Prize

Posted on April 12, 2011 at 7:08am 0 Comments

2011 Edelman Prize goes to Midwest ISO.  Midwest ISO is a energy management company and one of the largest in the world.


Press release here from INFORMS. 


From the press release...

"Every year, the Franz Edelman competition recognizes outstanding examples of operations research-based projects that have transformed companies, entire industries,…


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