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larrydag

1,278 karma · joined July 12, 2011

Machine Learning, Data Science, Predictive Analytics, Operations Research, Statistics. Industrial Engineer with experience in helping businesses make better decisions. I blog about my experiences at http://industrialengineertools.blogspot.com and provide IEOR Tools at http://www.ieortools.com

Founder and Organizer of Dallas R Users Group. http://www.meetup.com/Dallas-R-Users-Group/

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larrydag··on Inflation is a disease (1978) [video]
"The real tax on the American people is what government spends" -M. Friedman
larrydag··on Inflation is a disease (1978) [video]
At 11:00 there is a chart of the U.S. money supply (with CPI). Here is the current money supply (M2) chart produced by the Fed.

https://fred.stlouisfed.org/series/M2SL

larrydag··on Deming's Red Bead Experiment (2002)
The key to doing this experiment well is having the right facilitator that brings the attitude. A good facilitator will roleplay a leader/manager/exec that will praise when measures are good and berate when measures are bad. The idea of this experiment is to show how management can harm the process even when there is inherent variability, good or bad.

Here is Dr. Deming himself performing the experiment https://www.youtube.com/watch?v=7pXu0qxtWPg

larrydag··on Ask HN: Did I make a mistake jumping on the homestead bandwagon?
The traditional definition of homestead is an isolated farmhouse or ranch house. Typically refers to the residence on remote land for farming or ranching purposes. I'm not sure if it is the same reference in this context.
larrydag··on SUSE announces Liberty Linux, new distro for those who miss the old CentOS
is rpm vs deb distros still a thing? I haven't used a SUSE OS in quite some time.
larrydag··on Ask HN: Should I publish my research code?
Here's a good example. The Fisher's iris flower data was released with his work in a 1936 paper. It was used as an example of his discriminate analysis. This data set has been repeatedly used over and over to show examples of cluster analysis and segmentation. Many statistics teachers use it in their curriculum. You never know where the research could lead to growth and development in a field.

https://en.wikipedia.org/wiki/Iris_flower_data_set

larrydag··on I bought 1000 meters of wire to settle a physics debate [video]
My limited understanding, according to Veritasium, is that the wire is needed to create the electro-magnetic field. Veritasium's claim is the distance of the wire is irrelevant. It's the distance between the battery (power source) and bulb (resistance) is what is relevant. AlphaPhoenix is disputing that claim saying there is a lightspeed electron "wave" through the wires.

I think this is the most fascinating debate on social media currently.

larrydag··on Ask HN: What things has tech made worse in your life?
yup. We should be able to opt-in instead of having to opt-out of the slew of digital ads we see daily.
larrydag··on An engineer fighting Texas’s ban on Israel boycotts
To your point it sounds like the law prohibits for the state of Texas to work with companies that choose to boycott Israel. The person's rights are not prohibited but if they choose to take part in those activities then the state of Texas will not work with them.

https://www.texastribune.org/2019/05/09/Texas-anti-boycott-i...

This is not unprecedented among states in the U.S. Many states have banned government work and travel to other states and countries due to policy issues.

https://apnews.com/article/california-florida-lifestyle-trav...

larrydag··on The "five whys" productivity technique
A couple of ways to improve the 5 Why process that I've seen done in the manufacturing world.

1. Create why sessions with key people in the process. Sometimes answers to why are not always apparent. More people contributing can help illuminate

2. If meeting with a group have a facilitator that has done this before.

3. The group needs to have equal say and contribution. No one, including managers and leaders, can overrule or dissuade discource about the answers to why. Everyone's input is equally important.

larrydag··on Used car market gets even more bizarre
It's in the best interest of a bank not to repossess because there are operational expenses and the bank will get more return if the loan goes to completion.
larrydag··on Used car market gets even more bizarre
Here's the flip side of that from auto lenders. They are seeing a huge recovery benefit from repossession of vehicle after chargeoff. Lenders portfolios are seeing a net benefit in chargeoffs which has hardly ever happened in recent history. Even more bizarre.

https://www.yahoo.com/now/ally-financial-ally-beats-q3-12451...

larrydag··on Open source is coming to financial services
When building a proposal to C-suite or stakeholders bring it to a level they will understand. Don't focus on technology, stacks, interfaces. Focus on efficiency, improved operations, reduced costs, bigger bottom line. This is the language that is hard to argue.
larrydag··on Former Boeing 737 Max Chief Technical Pilot Indicted for Fraud
Also this feels a lot like Boeing offering up a sacrificial lamb. I find it hard to believe that the FAA can focus on one person at Boeing as the reason for the failure in reporting the issue. There are too many managers and engineers involved. On the surface this sounds a lot like the Challenger disaster story.
larrydag··on Always Multiply Your Estimates by π (2013)
One method of estimating projects is using the old method Activity Based Costing. This can be used to estimate time-related activities as well. The key is figuring out your total utilization of time cost estimates and per unit of time cost drivers.

https://hbr.org/2004/11/time-driven-activity-based-costing

larrydag··on Disappearing Bicyclist – Sam Loyd (1906)
Also the 2 o'clock boy has no flag in A then he has a flag in B.
larrydag··on The Shareholder Value Myth (2013)
Shareholder Value has been slowly changed as a focus for a while now. This article gives Steve Jobs as an example of focusing on the customer.

https://hbr.org/2011/10/steve-jobs-and-the-purpose-of

larrydag··on Statistical process control after W. Edwards Deming (2020)
GE and other companies tried to implement Demings approach. They called it Six Sigma. Those that used Deming's concepts were successful. Yet too many misunderstood the idea of SPC and used in areas that was not meant for quality control. For instance trying to use SPC in the managerial process itself.
larrydag··on A straightforward way to extend CSV with metadata
Thinking same thing. CSV is already a text file. Why not just append the metadata to the file already. Call it a CSF file or something like that.
larrydag··on Inventor harvests methane gas from ditches and ponds to power his moped
I would imagine a good use of a windmill could be use to pump and accumulate.
larrydag··on Roblox on Linux with recent Wine 6.11
It's kind of like a massively distributed sandbox game environment.
larrydag··on IRS records reveal how the wealthiest avoid income tax
So let me understand that ProPublica is calling a "true tax rate" as the rate they paid income taxes divided by the value of wealth?

For instance I'm having a hard time reconciling this paragraph.

"In that year, Bezos, who filed his taxes jointly with his then-wife, MacKenzie Scott, reported a paltry (for him) $46 million in income, ..."

That year reported $46MM in taxes yet the article keeps claiming the Bezos earned billions a year. I believe the article is conflating reported taxable income and wealth. The US tax system is based on taxable income and wealth is a totally different asset.

I suppose the article writer is proving the difference in rate of taxable income vs wealth but that same comparison needs to be done in all other income brackets as well. Perhaps I'm missing it but I'm not seeing the "true tax rate" across different household income profiles.

larrydag··on We only ever talk about the third attack on Pearl Harbor
This was the Millenium Challenge in 2002. Another interesting war simulation that seems the U.S. did not learn their lesson.

https://warontherocks.com/2015/11/millennium-challenge-the-r...

larrydag··on The Evolution of Management (2019)
One of the best books on management I've read is Out of the Crisis by W. Edwards Deming. While not specifically a management book he calls out management and leadership with his 14 points.

https://deming.org/explore/fourteen-points/

larrydag··on Movies every physics lover should watch (2020)
Here's some interesting commentary on the delta-v and the movie Gravity. https://www.rocketstem.org/2013/11/03/delta-v-gravity-situat...
larrydag··on Movies every physics lover should watch (2020)
Travelling between orbital spacecraft is not as easy at it sounds.
larrydag··on Movies every physics lover should watch (2020)
Interesting. Gravity is admittedly sci-fi but so is Interstellar and Contact. The list lost me at Back To The Future.
larrydag··on Movies every physics lover should watch (2020)
The Matrix
larrydag··on Movies every physics lover should watch (2020)
a mathematician film noir. A pretty good movie
larrydag··on Movies every physics lover should watch (2020)
Not a movie but I would suggest Halt and Catch Fire
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