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  • Dr. De Mars General Life Ramblings | statistics

    Statistics Prove Who is Dumber than a Rock

    ByAnnMaria De Mars December 4, 2011December 4, 2011

          Anyone who has ever taught has probably had this experience … you are reading a student paper and think, “I really don’t understand what he/ she is trying to say here.” Like most professors, you probably assume that in these situations, the students aren’t very clear on the concepts themselves. You’re probably…

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  • statistics

    Beware mean substitution ! (And the importance of mothers)

    ByAnnMaria De Mars December 1, 2011December 1, 2011

    Today was a lesson in why one should always be a little leery of mean substitution. I had downloaded a data set to use as a logistic regression example for my class tomorrow. It happened to be the 2010 Monitoring the Future study and I was particularly interested in school drop out. This is a…

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  • Open data

    Can you say Caveat Emptor if the data are free?

    ByAnnMaria De Mars November 26, 2011November 26, 2011

    Let the buyer beware – that phrase certainly applies to open data, as does the less historical but equally true statement that students always want to work with real data until they get some. Lately, I have had students working with two different data sets that have led me to the inevitable conclusion that self-report…

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  • Dr. De Mars General Life Ramblings | statistics

    I’m Claiming my Love Stats Award

    ByAnnMaria De Mars November 25, 2011

    It’s about time I got some recognition ! You can claim your own Love Stats award here. Careful, of undeserved awards, though. The last person who falsely claimed a Love Stats award had multicollinearity in his measures, a high VIF and died of complications of homoscedasticity. You have been warned.

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  • Dr. De Mars General Life Ramblings

    Geeks Guide to Women: AnnMaria Explains it All

    ByAnnMaria De Mars November 15, 2011November 15, 2011

    I am tired of hearing that men in technical fields cannot meet women. Some stupid company even went so far as to say that they had hired hot women to work at their company so now they were going to have no problem attracting good programmers and engineers. This is stupid on so many levels….

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  • Software | statistics | Technology

    Computing in the Cloud – Squared: Survival Analysis & SAS On-Demand

    ByAnnMaria De Mars November 13, 2011November 13, 2011

    Giving a whole new meaning to “computing in the cloud”, I finished up my paper “A gentle introduction to survival analysis” for the Nevada SAS Users Group from 30,000 feet up using on-board wi-fi and SAS On-demand.  I was shocked to find that the performance was much better in-flight. Presumably, if you charge people $12.95…

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  • Dr. De Mars General Life Ramblings | statistics

    Survival analysis tip from Ogden Nash

    ByAnnMaria De Mars November 5, 2011November 5, 2011

    I might as well give you my opinion of these two kinds of sin as long as, in a way, against each other we are pitting them, And that is, don’t bother your head about the sins of commission because however sinful, they must at least be fun or else you wouldn’t be committing them….

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  • Dr. De Mars General Life Ramblings

    Please Bias this Survey

    ByAnnMaria De Mars November 3, 2011November 3, 2011

    Completely unrelated to statistics, software or, anything really, my darling daughter number three is ranked in the top ten in the world in mixed martial arts. She has been nominated for female fighter of the year, which is decided in a scientific, objective manner by how many votes the nominees get on the Internet. She…

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  • Software | statistics

    LSMestimate statement – you’ll think it’s cool

    ByAnnMaria De Mars November 1, 2011

    Jon Peltier and I were going back and forth on twitter about why it is that people will post answers on a forum or mailing list that are completely incorrect. As Peter Flom says, “They are often in error but never in doubt.” Jon suggested there are three types; those who don’t know and admit…

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  • Software | Technology

    R vs SAS/SPSS in Corporations: A view from the other side

    ByAnnMaria De Mars October 29, 2011October 29, 2011

    I read Allen Englehardt’s post this morning, on R vs SAS/SPSS in corporations and it motivated me to set aside my infinite to-do list and write about something I’ve been thinking for a long time. Since Allen writes on R-bloggers, it will surprise no one that his conclusion was that R is preferable to SAS…

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