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Posts by Tom Carpenter, PhD

“Instead of” there is doing a lot of work

If I were still teaching, I would be talking about how to use AI to make us better writers… E.g. giving us feedback or critique… But the mental muscles I went to train have to to be the students’

3 months ago 0 0 1 0

Ask copilot or chat gpt. It can output a csv no sweat.

4 months ago 1 0 0 0

Possibly. We might also admit some things are not very knowable— without other “ways of knowing”

4 months ago 4 0 0 0

I often hear researchers feeling bad about this. But it’s called prioritization. The key is to do it intentionally and strategically. You have finite time and can’t do everything.

4 months ago 4 1 1 0

On the one hand, people need better education about AI

On the other hand, do we even understand what it means to be conscious in the first place?

4 months ago 4 0 1 0

Ah, but read what I said. I’m not saying it’s impossible to do valid online research. I am saying that volume will need to shrink. It’s going to be harder to stay on top of this. Some folks will give up or mess it up. There will be an arms race. Reviewers will start raising flags. Etc.

5 months ago 0 0 1 0

The volume of social psych papers that ran on prolific and mturk is going to need to shrink soon, and that will have a big impact on a lot of small labs

5 months ago 6 2 1 0

A huge pain, but doable with undergrad participants essentially for free (or at least historically so).

I’m not saying what is right… I’m saying what is driving behavior

5 months ago 2 0 0 0
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If we want this to change, then we need to make it feasible

TMP factor: Time, money, pain

Whether a study gets done depends a lot on how difficult it is. The question is one of ROI. I suspect many researchers are thinking to themselves, “that’s a great thing, but it’s not something I can do”

5 months ago 9 0 2 0
My 11-year-old sitting with her pile of Halloween candy, sorting it into a bar graph

My 11-year-old sitting with her pile of Halloween candy, sorting it into a bar graph

We have progressed from data collection to data analysis.

5 months ago 34677 4111 979 366
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ladies and gentlemen...we got him

5 months ago 18300 4044 170 185

* hoppening

6 months ago 1008 147 12 3

But where does 1a say anything about personhood? I’m reading it and it seems clear that you can’t restrict speech—and that would obviously apply to one or more people organized under a LLC. IMO the bigger question is “when is money free speech, vs when is it corruption”

7 months ago 1 0 2 0
Slide titled: "Assumptions of the model and model checking"
with a scatterplot with axes how much people should worry vs how much people do worry.

Slide titled: "Assumptions of the model and model checking" with a scatterplot with axes how much people should worry vs how much people do worry.

this slide is from a colleague's introductory stats course, I think it fits many statisticians' experiences

8 months ago 93 24 8 2

45. Academia doesn't reward building useful tools nearly as much as it should

8 months ago 35 4 2 1

14. We mostly evaluate latent variable models with the equivalent of Rorschach tests

8 months ago 11 1 1 0
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5. You should use a precision-recall curve for a binary classifier, not an ROC curve

8 months ago 23 2 1 1
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Wow. Scientists have edited mosquito DNA to prevent the spread of malaria to humans "while supporting essential physiological functions... and negligible fitness costs" to the mosquito population.

Potentially ending the mosquito-born spread of malaria to humans.

www.nature.com/articles/s41...

8 months ago 1085 310 39 43

… set of paths consistently supported by the data. Even getting that down is a trick. And making sense of it is fraught and doesn’t get you much further than one would get from regression. But at least then we would have some confidence we understand the correlational relationships!

8 months ago 0 0 0 0

… the model is correct and then gives you what the path would be under that specification. There’s nothing different when we go to SEM other than your ability to p-hack goes up exponentially. IMO this would be a great place to use machine learning approaches to train / tune models to find …

8 months ago 0 0 1 0

… all those hypotheses together (in the same way that ANOVA contest many multiple comparisons at once). There’s nothing different between this and running a bunch of regressions and claiming the results support the way you specified those models. In reality, it’s the reverse. Regression assumes …

8 months ago 0 0 1 0

Yes and see this a lot in social too. Proper use of SEM implies a particular philosophy of hypothesis testing in regression contexts. An omitted path is hypothesizing that path is exactly 0. A non-omitted path hypothesizing it is non-zero. Model fit is effectively the joint set of …

8 months ago 0 0 1 0

Yikes!

8 months ago 1 0 1 0

… SEM for causal discovery. However, if you have a good read on the causal process, it can be great for estimating parameters such as factor, loadings or paths with latent variables

8 months ago 5 0 0 0

This is probably not anything you don’t already know …. But I did a lot of SEM work and will repeat it anyway. The model assumes you know the causal structure. Fit indices will confirm that the model is a fit to the data, but many incorrect models can fit the data. So I would not use …

8 months ago 9 1 2 1

Curious how this compares to the cost of living per state

9 months ago 2 0 0 0
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9 months ago 6 0 0 0
Plot that depicts the average importance people in my data assign to their friendships (y-axis, on a scale from 1 to 5, depicted with 95% confidence intervals) by their age (x-axis, from 18 to 60).

Depicted are 3 different ways to model importance of friends as a function of age.
Using age as a linear predictor: this imposes a linear trajectory which comes with very tight confidence intervals (i.e., uncertainty is low).
Using age as a categorical predictor: this imposes no trajectory whatsoever but instead simply reproduces the means by age. The confidence intervals are very wide, in particular for those ages not well represented in the data (i.e., uncertainty is high).
Age splines: This results in a smooth trajectory that follows some of the bumps in the data, but not all of them. The confidence intervals are somewhere between the linear and the categorical case (i.e., uncertainty is medium)

Plot that depicts the average importance people in my data assign to their friendships (y-axis, on a scale from 1 to 5, depicted with 95% confidence intervals) by their age (x-axis, from 18 to 60). Depicted are 3 different ways to model importance of friends as a function of age. Using age as a linear predictor: this imposes a linear trajectory which comes with very tight confidence intervals (i.e., uncertainty is low). Using age as a categorical predictor: this imposes no trajectory whatsoever but instead simply reproduces the means by age. The confidence intervals are very wide, in particular for those ages not well represented in the data (i.e., uncertainty is high). Age splines: This results in a smooth trajectory that follows some of the bumps in the data, but not all of them. The confidence intervals are somewhere between the linear and the categorical case (i.e., uncertainty is medium)

Let's say you want to include age as a predictor in your model. How do you do that?

Here's an illustration of three options -- it's for a paper I'm working on (so if you feel like anything could be tweaked...).

9 months ago 158 29 33 2

There should be a corner at Home Depot where a guy with a table saw will slice you off custom lengths of hot dog from an infinite hot dog coming out of the wall

9 months ago 4128 613 86 56
Adele shattering a glass in her hand

Adele shattering a glass in her hand

There were two girls at Wawa just now talking about funny movies and one said, “Have you ever seen the movie Office Space? It’s an old people movie but it’s funny”

9 months ago 6854 370 413 61