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  1. Pinned Tweet
    6 Oct 2016

    My Coursera course "Improving Your Statistical Inferences" is live! I really hope you enjoy it!

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  2. Today a reviewer took great care to explain why they suggested a self-citation in a review. I did the same today in another decision letter. Good to see caution in self citations (the effect?). But also, sometimes we are actually experts, and have truly relevant work.

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  3. It is my belief that sometimes *not* naming observed ethical violations (either to an organization that checks ethical violations, such as Dutch LOWI, or publicly (with transparant evidence)) is itself an ethical violation. Not naming names is not automatically ethical behavior.

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  4. Retweeted
    20 hours ago

    Redefine the statistical significance threshold to p ≤ 0.005

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  5. Retweeted
    19 hours ago

    Our most stats-relevant episodes are 4, 25, 26, 42, 43, 46, 49, and 52. Listen or download here or subscribe to the show in your favourite podcast app 🎧

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  6. Retweeted
    May 3

    For the scientists looking for compelling podcasts with a current and irreverent edge, check out Good stuff with on statistics and academic hipsters. Highly recommended.

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  7. Retweeted
    May 3

    is looking for one more Associate Director to help run this very exciting operation. If you're outside of North America/Europe, like open science and crowdsourcing, and want to work with myself, , , and , shoot Chris a message/email!

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  8. Retweeted
    May 3

    In response to some general twitter outrage about the QRP of sequentially peeking at analyses and stopping data collection after a significant result, I made a shiny app to simulate different scenarios. See just how much the false positive rate increases:

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  9. May 3

    An excellent idea to to fund refugees by Dutch science funder . However, as noted by only people who already have an NWO grant (like me) can submit for *this* NWO grant (= Matthew effect). So great idea, but please make it open for *all* Dutch academics.

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  10. May 2

    Another excellent episode - what to do if your PhD supervisor does not value good research practices. At 95% of workshops where I teach (your?) PhD students, the first question is: How do I convince my supervisor we should improve the way we currently work? Let that sink in.

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  11. May 2

    Sequential analyses with the goal to use the fewest number of animals is very ethical and efficient. But you need to do it correctly and control your error rate. My 2014 paper explains how to get started with sequential analyses - the right way:

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  12. Retweeted
    May 2

    A massive undertaking. Who says you can't publish null effects in good journals?

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  13. Retweeted
    May 1

    At Prolific we're currently designing functionality that will let you collect representative samples easily and quickly. This would help make research more generalisable. Would you be interested in using such a tool? We'd love to hear your thoughts

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  14. Retweeted
    May 1

    Could psychological societies please stop press releasing conference abstracts (eg )? Conference abstracts are not peer reviewed. They should not be used as bait for unnecessary press attention.

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  15. May 1

    Look at this, (together with and ) organizing an early career meta-scientists meet-up (no seniors involved or invited!)! This kind of bottom-up collaboration makes me think the kids will be alright.

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  16. Retweeted
    May 1

    On the flip side of Kaufmann's point, I left academia because I didn't trust the field of psychology to care more about telling than the truth than about the wounded feelings of already successful psychologists.

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  17. Retweeted
    Apr 30

    Got an idea for a study that merits large-scale collaborative data collection? Consider submitting a proposal to the Psychological Science Accelerator. Proposals are due by June 20, 2018. For details, see (CC: )

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  18. Retweeted
    Apr 30
    Replying to and

    I think paper authorship should move towards a "credits" model, just like the one that was adopted by movies 100 years ago. Nowadays, it is rare that the director is *also* acting and *also* shooting the piece. Why expect this of us? Collaboration - properly rewarded - is key.

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  19. Apr 30

    The screenshot below predicts the response by . I understand it hurts to see a long-time collaborator criticized. Punishment is very messy (I wish it wasn't, but it is). But there is no need to accuse people who try to fix science of being jealous. 2/2

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  20. Apr 30

    Attributing bad intent to punishers is common, see this great article "The reputation of punishers" It is also why so few people speak out when they see bad behavior in academics - their attempts to improve science will be seen as jealousy 1/2

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  21. Retweeted
    Apr 30

    Finished Coursera course today. Such an awesome (and free!) resource. Highly recommend it!

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