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Tren Griffin
@trengriffin
, 3 tweets, 2 min read Read on Twitter
Saying something "has 5G" is like saying something you are eating "has mustard." The radio frequency used will produce very different outcomes, just like mustard's performance varies with the food. 5G deployed at 2.4 GHz is not like 5G deployed at 28 GHz. cnet.com/google-amp/new…
"Verizon has the upper hand when it comes to consistently fast 5G speeds ... when you can actually latch on the network. Sprint shows how slower-but-broader 5G coverage can still benefit you with faster-than-4G downloads across the board."

It's physics. google.com/amp/s/arstechn…
It is disappointing to some people that the laws of physics are not just guidelines! When a technology like Massive MIMO comes along that works with Shannon's law by using multiple antennas we see dramatic improvements. But the laws of physics remain laws and not just guidelines.
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Tren Griffin
@trengriffin
When I write a 25IQ blog post like I did this morning on @skupor 's new book I never have an editor. I make changes to the text up to the last minute. I appreciate when someone picks up a typo. Two of my motto's are: write fast and furious and write first and ask question later.
"For 14 years he toiled unremittingly. He had his subject at his finger ends, and at last was ready to begin. He sat down to write. He died.

He did what he wanted, and he died when his goal was in sight and never knew the bitterness of an end achieved."
redfez.net/fiction/obsess…
Somerset Maugham's Mayhew is an example of how you can convery ideas with a story. He said once: "I have never pretended to be anything but a story teller. The telling of a story just for the sake of the story is not an activity that is in favor with the intelligentsia."
Read 3 tweets
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Tren Griffin
@trengriffin
My 25IQ post today is a review of Scott Kupor's new book: Secrets of Sand Hill Road (Venture Capital and How to Get It)" 25iq.com/2019/06/08/sec…

"Wise entrepreneurs understand how the VC business works, what makes VCs tick, and what ultimately motivates (and constrains) them.”
If you ever do write a book do it for yourself and/or because you love to help other people learn more. Writing for me is relatively easy. Getting people to read what you write is extremely hard. Few people will read my blog post on Kupor's book, but writing it was enjoyable.
Skilled and experienced professionals avoid time and energy wasting behavior. They tend to avoid pointless posturing and counter productive negotiating styles. If you have a choice between dealing with an idiot or a professional, dealing with the professional is a better option.
Read 3 tweets
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Tren Griffin
@trengriffin
I will post a book review tomorrow morning on 25iq.com. Most people don't know how hard it is to sell a book if you're not famous.

"Year-over-year sales for top 100 titles increased 21% in Dec 2018, but sales of titles ranked between 100 and 1,000 declined 3%."
"Print books sales volume grew 1.3% compared to last year with 696M units sold The biggest bestsellers sold more copies than the year prior. In fact, five titles sold more than 1M copies, compared to only two titles that reached similar heights in 2017." npd.com/wps/portal/npd…
In 2019 the overall book market is down by about 2.5%, including a negative first quarter (-2.9%).

Writing blog post is similar to writing a book and one common point is critical: if you are not writing to make yourself happy via the writing itself, you will be disappointed.
Read 3 tweets

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David Harvey
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CHAPTER 24: THE TRANSFORMATION OF SURPLUS-VALUE INTO CAPITAL (2nd thread)
What this means quite simply is this: capitalism is always about growth.
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Jens Notroff
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#GobekliTepe‘s monumental T-pillars are actually giant #anthropomorphic sculptures. Got to admit that in the beginning of my work there, more than 12 yrs ago, I found it quite ... challenging to recognize this likeness. Until we finally excavated the 'hands & loincloth' part ...
Of course #NevaliCori‘s pillars were already known for some time, complete with hands and stola-like garments. But their abstracted and stylised appearance (still impressively expressionistic to me, by the way) made it a bit of a challenge to easily accept their human shape.
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Patrick Markey
@patmarkey
New paper out based on a massive sample (n = 355,358) finds that screens explain less than 0.4% of depression AND shows why previous research is deeply flawed - unless you are willing to believe potatoes and eyeglasses are also destroying a generation (Thread 1/13)
2/13 Although most scholars would agree this effect is tiny – similar effect sizes using this SAME data set are the basis for the radical claims about the dangers of smart phones. But what the Nature: HB paper does next is exciting.
3/13 It examines how strongly various neutral items in these data sets were related to depression (below a 1x effect means it had the same effect as screen time). For example, the effect of wearing eyeglasses on depression is 1.45 times greater than the effect of screens!
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Glen Peters
@Peters_Glen
Does model bias effect outcomes of the #IPCC 1.5°C emission scenarios #SR15?

The scenario database is over represented by some model frameworks. Taking statistics will over represent some models (eg, REMIND, AIM), discount others (eg @IEA), & not all models included!

THREAD 1/
The bias varies by scenario category, here for 1.5°C scenarios with "no or low overshoot" as highlighted in #SR15. Should REMIND & POLES get more weight then GCAM or MERGE?
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I often take medians of scenarios to simplify communication, trying to reveal the "key characteristics" of 1.5°C (trying to find robust messages). The scenario community does not like this approach
3/
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JJ/ @RealScientists
@realscientists
Supernova progenitors! Wooooo!

First question, what is a supernova? Second question, what is a progenitor?

Well a supernova is a very bright source we see in the sky, a single star almost outshines all the rest of the stars in a galaxy, when galaxies have billions of stars.
Here is a good picture of a supernova and it's host galaxy (taken from apod.nasa.gov/apod/ap150531.…). As you can see that source in the lower right is as bright as the central nucleus of the galaxy. And it can stay that way for months or weeks.
Now we classify supernova by their observational characteristics. Most probably type I have no hydrogen in them while type II have hydrogen observed. As hydrogen is the most abundant element in the Universe its odd that something don't have it! The other important lines are...
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Arindrajit Dube
@arindube
Let's talk about synthetic controls (SC).

This is probably the most popular way to do policy evaluations right now (besides the basic difference-in-differences, which the SC generalizes). It’s a very successful method. But … there are some issues.

Thread begins ... 1/.
First, what should you use to fit a SC? Lagged outcomes (all? some?)? Other covariates? There isn’t much guidance on this. Ferman, Pinto and Possebom show how cherry picking between 6 common configs can facilitate p-hacking.
dropbox.com/s/gcdplmkhq5hy… 2/.
One way to choose predictors is cross-validation. In this paper, we use the pseudo-treatments in placebo units to select predictor sets. ftp.iza.org/dp8944.pdf

But more needs to be done here to provide better guidance. 3/.
Read 11 tweets

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