Rick Wicklin

@RickWicklin

Programmer with R&D. Blogger. Author of _Statistical Programming with SAS/IML Software_ and _Simulating Data with SAS_

Cary, NC
blogs.sas.com/content/iml
Liittynyt lokakuu 2010
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Twiitit

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  1. Kiinnitetty twiitti
    14. tammik.

    Posts from The DO Loop blog in 2020 that deserve a second look

    1 vastaus 1 uudelleentwiittaus 5 tykkäystä
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  2. 16. marrask.

    Halfway through comes the key word: "audience." When you create a graph, do so with your target audience in mind. "our chart... won’t be as useful to the audience as it could be" unless we know "what it needs to communicate about the data."

    Worth your time:
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  3. 10. marrask.

    My book _Simulating Data with SAS_ is the "E-book of the Month." Take advantage of this opportunity to own it at 40% off!

    Check out the November newsletter where you can get a new free e-book on Add-In for Office and 40% discount on 's Simulating with e-book.
    1 uudelleentwiittaus 10 tykkäystä
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  4. 6. marrask.

    For more about rank correlation, and how to compute it in , see

    Spearman rank correlations assume no distribution for X and Y. It's a good alternative to Pearson when X or Y is ordinal.
    1 vastaus 4 tykkäystä
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  5. 28. lokak.

    An introduction to genetic algorithms in . Genetic algorithms are heuristic methods that use randomization to mimic natural selection and evolution.

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  6. 28. lokak.

    Crossover and mutation: An introduction to the two most important operations in genetic algorithms.

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  7. 28. lokak.

    Penalties versus constraints in problems. When can you replace a constrained optimization by adding a penalty term to the objective function and solving an unconstrained optimization? Some math and an example.

    2 tykkäystä
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  8. uudelleentwiittasi
    26. lokak.

    🎉 Celebrating with a graphing puzzle to make your own 🎃

    2 uudelleentwiittausta 7 tykkäystä
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  9. 27. lokak.

    David Hand has mentioned this in connection with his "Laws of Coincidence." The Law of Truly Large Numbers says that even rare events are expected to occur when a trial is repeated a large number of times.

    'It is a part of probability that many improbable things will happen.' -- Agathon, quoted in Aristotle's Poetics
    1 uudelleentwiittaus 1 tykkäys
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  10. 27. lokak.

    The knapsack problem is a well-known problem. How to solve the knapsack problem by using binary integer programming in

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  11. 27. lokak.

    AND, OR, and NOT: logical statements with scalar quantities are straightforward. But is it easy to program the logical negation of a binary vector? (Spoiler: Yes!)

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  12. 27. lokak.

    Nonuniform sampling: How to choose samples with specified statistical properties.

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  13. 27. lokak.

    Interpret estimates for a Weibull regression model in .

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  14. 27. lokak.

    I'll be giving a on Nov. 9 at 11 am ET about communicating -related statistics and visualizations, with a focus on clear communication to non-scientists. Based on a series of COVID-related blogs posts I wrote in Spring 2020.

    1 uudelleentwiittaus 3 tykkäystä
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  15. uudelleentwiittasi
    28. syysk.

    Breakthrough cases of polio—including deaths—were common during early polio vaccination. What kept us safe was not perfect vaccine efficacy. It was that Americans quickly & massively stepped up to get the imperfect vaccine, quashing transmission. From:

    2 753 uudelleentwiittausta 7 848 tykkäystä
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  16. 9. syysk.

    Wow. This thread is about a TV episode from 60 years ago. Plot synopsis:

    due to obviously relevant reasons, would you like to know how andy finally convinced rafe hollister to get a tetanus shot after rafe refused to let the county nurse vaccinate him
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    1 uudelleentwiittaus 1 tykkäys
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  17. 9. syysk.

    The ATAN2 function in and how to use it to compute polar angles:

    Use atan2, not atan. That's it, that's the tweet.
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    1 uudelleentwiittaus 4 tykkäystä
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  18. 3. syysk.

    Q: When are most babies born in the US? A: The weeks after LABOR day! Actually, this joke is true! See a summary of the at based on Natl Ctr for Health Stats

    2 tykkäystä
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  19. uudelleentwiittasi
    1. syysk.

    This is arguably the most important single piece of epidemiological research of the entire pandemic. A MASSIVE randomized trial launched a pro-mask campaign in some Bangladeshi villages, but not others. The result: masking villages got less COVID.

    241 vastausta 2 721 uudelleentwiittausta 8 108 tykkäystä
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  20. 3. syysk.

    Celebrating my 11th Blog-iversary! Eleven years of blogging about , , , programming, , and matrix computations at The DO Loop:

    2 vastausta 3 uudelleentwiittausta 21 tykkäystä
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  21. 2. syysk.

    I thought this was a joke, but it's actually in a journal. Don't know whether to laugh or cry.

    Vastauksena käyttäjälle @MaartenvSmeden
    Source:Journal of Circulating Biomarkers
    1 uudelleentwiittaus 2 tykkäystä
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