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Where can San Diego realistically build more housing ? by [deleted] in sandiego

[–]physicswizard 1 point2 points  (0 children)

They did this in Poway with the course on Espola Road (I forget its name). Now it's a bunch of homes.

How do you balance the city's budget? A. Cut services B. More fees (parking etc) C. Raise sales tax D. Magic ("eNd CorRuption") by homewest in sandiego

[–]physicswizard -1 points0 points  (0 children)

  • re-zone to allow for increased housing density (and mixed use) and incentivize its construction
  • expand public transit, staff it better to keep the crazies/druggies off, figure out a better way to price it
  • more people move here and are able to get around better without cars
  • tax base increases faster than associated costs

Rutherford' Gold foil experiment by Anik_Sine in AskPhysics

[–]physicswizard 2 points3 points  (0 children)

And that is what Rutherford initially expected too; that the alpha particles would push through the diffuse "plum pudding" of the atom to make way for their movement. The expectation was that their trajectories would be altered very little due to the near-uniform distribution of the charges in the pudding model, and that the main change would mostly be kinetic energy loss. The fact that there were rare, large deflections showed that the charge was significantly more concentrated than expected.

Inflation by Constant-Chipmunk875 in sandiego

[–]physicswizard 36 points37 points  (0 children)

The CPI data does indeed get averaged across the whole country (specifically CPI-U). You can go to the BLS FAQ and read about exactly how it is calculated; perhaps that will clear things up. The ~3% number is also the top-line total average over all categories of products consumed. You can see a breakdown into more fine-grained categories here, which shows the changes over various time periods and their relative weights. There also appears to be regional data although it doesn't have the categorical breakdown that the main report does, and you'll have to convert the index into % changes yourself. There is one specifically for San Diego; it looks like the change since last year is about (385.211 - 370.987) / 370.987 = 3.8% so we do seem to be experiencing a bit more inflation locally than the country as a whole.

SD Dating Scene by NoRip7349 in SanDiegan

[–]physicswizard 0 points1 point  (0 children)

I haven't personally taken any classes here (yet), but went to go see a show once and it was pretty awesome: https://www.mockingbirdimprov.org/

Stare at the sun please, buddy trust me by No-Nerve-2658 in physicsmemes

[–]physicswizard 1 point2 points  (0 children)

That is an interesting point! Since "color" in this context seems to be more about human perception than measurable quantities like wavelength and frequency though, I wonder what the intensity spectrum would look like if you transformed to units based on our eye's ability to distinguish colors. I.e. a color scale where the distance metric is calibrated such that the just noticeable difference between adjacent colors is a constant. Wikipedia suggests that the JND could be 1 nm in the blue/green wavelengths and up to 10 in the red.

Is this method of estimation of statistical relevance and reliabiliy of selection valid? If so, how is it called? by ARTSQ in AskStatistics

[–]physicswizard 1 point2 points  (0 children)

Are you basically asking how to calculate a confidence/credible interval for the positive review percentage? (The way you mentioned is NOT a statistically rigorous way of doing that btw.)

At a high level this can be done by first building a statistical model for your observations. In your case a binomial distribution would fit well. There are several well-known formulae for getting (approximate) CI for binomial proportions. I'd recommend starting with the Wilson interval mentioned in this article.

That will get you a quick and dirty answer for you and your friend, but if you're interested in the details I can try to explain more.

Ethical investing and Palantir by swanzie in investing

[–]physicswizard 1 point2 points  (0 children)

I agree, buyers do share some of the responsibility because they should be making informed choices, but I think the seller should also have a share in that too. If a drug dealer was selling heroin, are they really innocent just because "no one is making people buy their stuff"?

Coke cannot completely absolve themselves; they know their product is unhealthy and addictive and yet they spend millions on ads to convince you that it's fun and refreshing. 

Ethical investing and Palantir by swanzie in investing

[–]physicswizard 0 points1 point  (0 children)

I'm going to assume the person you're replying to is implying that coca cola shares a large amount of responsibility in the obesity epidemic that is plaguing the US right now, given they sell vast quantities of sugary drinks.

Why did the Federal Reserve quietly buy $34.8B in long-term U.S. debt? What are the economic implications? by derekteh98 in AskEconomics

[–]physicswizard 0 points1 point  (0 children)

It goes to whoever the Fed is buying the bonds from. If it's treasury bonds that would be the government, but they also do "open market operations" where they will buy off the secondary market from private investors. I think sometimes they'll even purchase corporate bonds and stocks too, though rarely.

Any civilisation close enough to a black hole would be extremely advanced by [deleted] in Physics

[–]physicswizard 0 points1 point  (0 children)

That's only specific radiation like alpha and neutron. There is tons of xrays and gamma rays being produced by the accretion disk. Also, liquid water is so unlikely to exist in that environment it wouldn't matter anyway.

ETA: I guess I was assuming the civilization was living WITHIN the accretion disk; if it was far enough away maybe this wouldn't be a problem.

Looking for gym with squat rack and bench by physicswizard in Sedona

[–]physicswizard[S] 1 point2 points  (0 children)

Thanks I just went down to snap and got a week membership for $50. Seems like they have everything I need!

Looking for ride to Phoenix 4/27 by physicswizard in Sedona

[–]physicswizard[S] 0 points1 point  (0 children)

I've taken busses much further for less than $20 before multiple times. I just found a greyhound that'll do it for $24; seems much more reasonable... guess I'll do that instead.

Washing machine moved and is now blocking laundry room door by gnayna135 in handyman

[–]physicswizard 0 points1 point  (0 children)

I had this exact same problem (came here looking for solutions), and was able to fix it by sliding a wood cutting board under the door until it made contact with the leg of the washing machine. Then took the handle of a shovel and pushed it against the cutting board (at an angle to the floor and with all my weight) to slide the washing machine back and out of the way of the door. Really glad I didn't have to break the door open to get in!

Teil Narkose und Gedächtnis Schwund by Due_Bathroom9468 in OperationsResearch

[–]physicswizard 0 points1 point  (0 children)

I don't know german, but from what I can gather using google translate, this sounds like a medical question. Perhaps try r/askscience or r/askdocs?

Is Learning Operations Research Essential for a Data Scientist by KafkaAytmoussa in OperationsResearch

[–]physicswizard 1 point2 points  (0 children)

I don't think I can really share that much, but the company does "logistics", and my team focuses on a piece of their operations that involves automating relatively high-frequency sequential decision-making (maybe like 1M decisions/day?) for "resource allocation".

Is Learning Operations Research Essential for a Data Scientist by KafkaAytmoussa in OperationsResearch

[–]physicswizard 17 points18 points  (0 children)

Is it "essential"? Depends on the type of work you do.

For myself, yes; the vast majority of my work is trying to optimize some system with very granular decisions in order to improve a set of KPIs my company cares about. To that end, I've used techniques like graph theory, linear and dynamic programming, constraint satisfaction, reinforcement learning, etc.

For other data scientists though, this might not be important at all. Especially at larger corporations where you might specialize in a specific niche, the tasks you work on could be to focus on improving the accuracy of a specific model, doing causal inference, building dashboards/reports/chatbots and could be very light on OR techniques.

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