M_Bus

Hi, All! Hoping someone can help me with this!

I was asked to fix my mother-in-law's (mother's-in-law?) Pre-2016 Gaggia Classic. It was just dead. No water flow at all. So I replaced the pump, and now it's flowing! Water is coming out!

But the flow rate was pretty mediocre, so I did what anyone would do: I tore apart the boiler, solenoid, and OPV. I was in luck! There were HUGE pieces of scale floating around the solenoid, so I was sure I had figured it out. I de-scaled everything both chemically and mechanically. That solenoid valve is shiny clean. There is definitely no blockage in there anymore.

After re-assembling, I finally had DECENT water pressure, but it still falls short of m

I'm just starting working on stage 5. I have found that I can recognize subtle dullness pretty intuitively just by noticing that the clarity of my observation declines steadily. It's like a windshield that's slowly fogging up.

But the book kind of implies that the opposite of dullness can be easily imagined by considering a situation where you're very alert, like how someone might get when they're in a tense situation. The book says that MOST of the time, we're in a kind of mild, stable subtle dullness, and this stage helps us clear that away so we're more persistently alert. Sounds great! I honestly struggle with this daily.

But I guess I'm wondering if anyone has experienced that directl

Hi, Everyone! I'm pretty new to meditation. After reading a few books* and attempting meditation a few times off and on over the years, I'm trying to commit to a regular practice. As part of that, I've been using the BrightMind app, and I read about 75% (so far) of Shinzen Young's book "The Science of Enlightenment." But I'm having a bit of a hang-up, and I wondered if anyone could offer advice / thoughts.

Shinzen Young (and Brightmind) discuss thoughts as basically arising in three main "flavors" - mental images, mental talk, and bodily sensation of emotions. I have experienced all of these, and so I agree that thought comes in these types. However, what's bothering me is that it seems to

I just bought a new house. The water pressure in the master shower was terrible in spite of it being a new renovation! New pipes in the walls, so that's weird. The plumber traced to a stretch of galvanized pipe in the basement which was easily replaced. That improved the water pressure in most faucets on that floor, but not the master shower!

The plumber suggested that the shower cartridge was probably full of particulate matter that came up from the galvanized pipe, so we replaced that and.... no improvement! So the plumber has now suggested that the only thing left to replace, basically, is a cartridge (?) that is part of the diverter that the previous owners put in.

So there is the norm

Let me start by saying: I don't need a formal explanation - I'm really looking for good reference material. If you have any papers you'd recommend, I'd really appreciate it!

I am trying to assess whether variables in a GLM are predictive (not just whether or not they're statistically significant). I've found that although AIC and its ilk are useful approximations for the out-of-sample prediction error, they seldom perform as well as true cross validation if I have the data available.

However, my question is: what are good options for statistics to consider for cross validation?

For reference, the dependent variable is a positive real number - usually somewhere in the 20 to 120 range.

I just had a great experience with TWSBI, and since they went out of their way to be good to me, I just felt like I needed to put in a good word for them in some way. I don't have any relationship to the company in any way.

I have a clear Vac 700 pen that's about three years old at this point, and the cap broke last night. F.

I asked someone more-in-the-know than I about what I should do. He said that he'd had a problem with a pen and reached out to TWSBI directly, and they helped him out.

So I did just that using their contact form, and within 24 hours they offered to send me a replacement cap FOR FREE if I pay for shipping ($4)! I thought that was pretty d

I recently read that the Trump administration had abandoned the question of citizenship on the short form census. Although it's basically impossible to leave politics aside, let's do it for just a second. Suppose hypothetically that the citizenship question had been included. I guess I would have thought that to get an appropriate population estimate you would take the census as data and estimate the demographics using, say, MRP. In the case of the citizenship question, you could just build a model for non-response and then you could get (I assume?) decent demographic estimates, right?

I guess my question is: am I wrong about the stats, or am I wrong about how the census is used (e.g., they

A couple weeks ago, I posted to see if there was any interest in a math book club. There were about 11 people who expressed interest, but when I reached out for follow-up, only maybe 4-5 people replied.

Anyway, we're having our first meeting on April 13 at Birchwood Cafe at 5:00 PM.

What will we be reading? That remains to be determined, but I've heard some interest in:

• Reviewing some concepts from calculus
• Differential equations
• Measure theory
• Number theory topics

But we haven't even met yet, and I definitely have not heard from everyone involved. Could do probability theory and stats, top

This is bound to be pretty niche, but I wondered if anyone might be interested in getting together on a semi-regular basis to go through math stuff.

I'm 33 and I'm an actuary. I am interested in learning more math and statistics, but I'm not in a position to do graduate school. Also, I don't have many friends in the area.

I was thinking it might be cool to meet up regularly to go through some math text(s), compare my understanding to other people's, and have a drink. Then we'd pick a chapter, set of chapters, article, or whatever for next meetup.

Right now I mostly read stats and probability theory, but I would be open to a huge range of math topics: advanced calculus applications, differ

I hope this question isn't redundant, but I can't find a good answer in my search of this sub or the wiki.

I have often considered that in the classic "3 Rs" approach, the order given is actually an order of preference: reducing consumption is really the ultimate goal, followed by reusing materials, and finally (when all else fails), recycling.

In many ways, the "5 Rs" seems to me to be kind of a rebranding of the "3 Rs" - "refuse" and "reduce" seem to me to be the same idea - cut consumption - and I used to think of composting as a kind of reuse or recycling (of organic or biodegradable material) until now. And since "Rot" was added at the end of the list, that makes me wonder if it is re

I was recently reading about orthogonal polynomials, and didn't really know what the inner product was in the vector space of polynomials with degree at most n. So I looked it up, and found out that it is usually given as: [; \int _ {-1} ^ {1}p(x)q(x)dx ;] for some p(x) and q(x) in P^(n).

This also gives rise to the L2 norm, and you can use this to construct Legendre polynomials, and so forth.

What I'm having a harder time grasping is what the concept of "orthogonal" really "means" in terms of an intuitive interpretation under this inner product. And to answer that, I started wondering about the idea of "orthogonal" under different inner products.

An inner product is any relationship that

I live in the northern midwest in a house built in 1885. The roof is nearing the end of its life, but I can't get it replaced immediately because I share the roof with several neighbors (kind of a condo thing), and it takes time to get these things moving.

Over the last year, we started noticing some bubbling paint on the top floor of our house under a pitched part of the roof next to some dormer windows - it's a pretty slow leak, and we only noticed water damage when there was driving rain. But over time it seems to be getting a bit worse, and it seems to be damp after a normal rain shower. I had a roofer come and try to do some minor repairs (to buy us some