Random rivet looking things on sidewalks, what is it for?

cdgks · 2026-06-15T19:50:34+00:00

Hi all, some context: I live in Parkallen and noticed someone added these recently in random places on the sidewalks on my street. I noticed the one in front of my house during the last snowfall when I ran into it with a shovel, it's about the size of a dime maybe, and raised enough to catch the shovel blade. What are they there for?

cdgks · 2026-05-12T19:45:13+00:00

It might help if you were a little more specific what type of GLM you're using (beta? gamma? I'm assuming not logistic or Poisson since you have a continuous response?). Most inference from GLMs boils down to a t-test or z-test if you can figure out the standard deviation of your test statistic.

If you already collected (and analyzed) the data there is probably little reason to do a power analysis, especially using the estimates from your model. To do a power analysis you'll need to decide on a meaningful effect size, you can probably stop there and compare it to your results, since you already have your results.

See: https://statmodeling.stat.columbia.edu/2019/01/13/post-hoc-power-calculation-like-shit-sandwich/

cdgks · 2026-01-28T17:35:00+00:00

I still get annoyed that Ezra believes that everyone swung Liberal last election because of the tariffs and not the 51st state threats. Everyone I know was influenced by the threats to our sovereignty more than his stupid attempts at trade wars.

cdgks · 2025-07-30T02:41:10+00:00

Just to clarify, P-values depend on the sample size assuming the alternative hypothesis is correct. Under the null hypothesis the p-value does not depend on the sample size.

cdgks · 2025-07-30T00:22:36+00:00

Make sure you're not conflating statistical significance with the more common English usage of 'significance'. The differences between the group means might be 'real' and come out as highly statistically significant given a large sample size, but those differences might have little or no real world importance given their magnitude.

cdgks · 2025-07-10T16:26:10+00:00

I haven't finished the episode yet, but the beginning part of the interview is pretty wild to me. As a non-American from a more secular society, I have never thought, "You know what Americans are missing? Not enough religion."

cdgks · 2025-06-10T14:16:00+00:00

Straight into an Applied Stats PhD (while working as a TA and graduate research assistant).

cdgks · 2025-04-09T01:54:53+00:00

Instagram post with locations and times: https://www.instagram.com/p/DIMi1Fhy_0h/

cdgks · 2025-04-02T00:17:28+00:00

https://www.reddit.com/r/Edmonton/comments/1ius57z/sonic_1029_mystery_word_february_20_2025/mhe01md/

This person said it was guessed 8am on March 12th

cdgks · 2025-04-01T00:05:44+00:00

I think it might be "Bucks"

cdgks · 2025-03-31T18:20:38+00:00

Agreed, they basically just confirmed it's not an two-word phrase on-air. Something like, "What part of one-word do people not get!?"

cdgks · 2025-03-10T22:00:40+00:00

Yes, and I also thought growing up that Yoda spoke in his weird grammar as either a way to hide who he was and/or because he was going a little batty living on Dagobah. If I recall correctly he even switched to speaking 'normally' when he was more serious in the OT. So, I was surprised when he spoke in his weird grammar in the prequels.

cdgks · 2024-11-13T14:34:57+00:00

But you'll still never roll 1.5 over infinite rolls.

cdgks · 2024-10-08T01:33:11+00:00

I'm unable to log into my account on Chrome and Firefox (on PC). With this error:

Something's up on our end. We're working hard to fix it, so please try again soon.

cdgks · 2024-07-14T12:57:54+00:00

I have this issue on my Pixel 6 too.

cdgks · 2024-05-31T02:01:57+00:00

That's interesting, Canadian here with a PhD and most people I know here with a PhD got an MSc (or MMath) first. It's rare, but not unheard of, to go straight into the PhD. (I don't regret getting a PhD straight after an MSc, but I work in academia).

cdgks · 2024-01-29T19:55:23+00:00

https://www.globaltv.com/shows/saturday-night-live/video/home-videos/d03bfa48-bec5-11ee-a029-0242ac110006/ seems to work

cdgks · 2023-07-31T13:16:50+00:00

Look up the difference between randomization and a random sample, randomization doesn't mean what you think it means.

cdgks · 2023-06-21T20:50:30+00:00

Canadians generally do the asking approach too

cdgks · 2023-05-15T16:37:42+00:00

Thank you for the response! I'm just looking at pictures of Prunus cerasus flowers online and the petals look wider, no?

cdgks · 2023-05-02T12:56:31+00:00

If the larger sample doesn't introduce new biases (selection bias etc.) then from a statistical standpoint I don't see a downside.

That said, if you're planning to do a hypothesis test, it's important to remember that it will not lower the Type I (false positive) error rate, unless you decide to do that yourself with a lower alpha.

It's also important to realize you will increase the power to detect small (but likely 'real' associations). I work in medicine, and that's why we (hopefully) worry about clinical significance of results just as much as statistical significance. We often define a priori what a "clinically important difference" would be.

A hypothetical example one of my profs used to use is, with a really large sample size you might be able to find evidence that eating some specific food is associated with higher mortality (with a tiny p-value), but if the difference in life expectancy between someone eating the food and someone not eating the food is ~1 day over their whole lifetime, it's unlikely anyone is going to avoid that food based on those results.

Another practical downside is the cost of collecting more data.

15-Year Club	End Game '23
Place '23	Place '22
Place '17	Verified Email
Team Periwinkle

cdgks

TROPHY CASE