Posts Tagged ‘overconfidence’

Michael Mauboussin on investor psychology

Michael Mauboussin on investor psychology

Courtesy of Edward Harrison at Credit Writedowns 

The Cabalistic analysis

When I was in business school in the mid-1990s I took a securities analysis class with Michael Mauboussin, who was an Adjunct Professor then working at Credit Suisse First Boston (he’s now at Legg Mason).  The class, which focused a lot on investor psychology, heuristics and the like made an indelible impression on me and cemented my aversion to the whole random walk, efficient market hypothesis claptrap.

Mauboussin would give us little experiments that proved his points. I pointed to one on investor overconfidence in a post I wrote in December 2008.

All of us have a bias that reinforces a false belief in the certainty of what we believe to be true. It’s called the overconfidence effect. Basically, we construct a mental map in our minds of what is probable and what is improbable. Over time, these beliefs harden and become what is certain and what is certainly not. I got a true test of this in business school.

My professor asked us some off the wall question like how much does the earth weigh. After we wrestled with the question and wrote down our answers, he then asked us to put a 95% confidence interval around the answer. He said give me a range of numbers that you believe the earth’s weight is 95% certain to be in. We mulled this over and answered. Result? Our 95% confidence interval was wrong something like 40% of the time within the class. Why?

Basically, by asking us the first question: how much does the earth weigh and giving us a chance to think about it, our professor was secretly giving our little pea brains a chance to become overconfident. By the time he asked us the second question, we had become anchored to the first answer. Essentially, he asked us to think outside the box and the mix of our overconfidence and anchoring caused us to make catastrophically wrong answers.

That’s how humans work. And this was a


continue reading


Tags: ,




 
 
 

Phil's Favorites

Here's how scientists are tracking the genetic evolution of COVID-19

 

Here's how scientists are tracking the genetic evolution of COVID-19

Why do scientists care about mutations on the coronavirus? Alexandr Gnezdilov Light Painting

Niema Moshiri, University of California San Diego

When you hear the term “evolutionary tree,” you may think of Charles Darwin and the study of the relationships between different species over the span of millions of years.

While the concept of an “evolutionary tree” originated in Darwin’s “...



more from Ilene

Biotech/COVID-19

Here's how scientists are tracking the genetic evolution of COVID-19

 

Here's how scientists are tracking the genetic evolution of COVID-19

Why do scientists care about mutations on the coronavirus? Alexandr Gnezdilov Light Painting

Niema Moshiri, University of California San Diego

When you hear the term “evolutionary tree,” you may think of Charles Darwin and the study of the relationships between different species over the span of millions of years.

While the concept of an “evolutionary tree” originated in Darwin’s “...



more from Biotech/COVID-19

Zero Hedge

US Total Passes 350k As Tri-State Area Cases, Deaths Surge: Live Updates

Courtesy of ZeroHedge View original post here.

Summary:

  • First 'confrontation' reported at White House task force
  • 'Peak week' begins in the US
  • Experts question drop in NYC hospitalizations, deaths
  • Situation in Italy, Spain continues to improve as UK reports biggest jump in fatalities
  • Belgium cases break above 20k
  • Russia reports biggest jump in new cases
  • CT, NJ, NY report jump in cases, deaths ...


more from Tyler

ValueWalk

Activists demand revamp of anti-redlining law

By Anna Peel. Originally published at ValueWalk.

Over 100 California Community Organizations and Leaders Call for Banking Regulators to Stop Planned Revamp of Anti-Redlining Law during COVID19 Crisis

Q1 2020 hedge fund letters, conferences and more

Worker, Housing, and Small Business advocates call on all resources to be dedicated to saving lives and responding to Coronavirus

San Francisco--Amongst an unprecedented public health crisis that threatens hundreds of thousands of lives, as small businesses are shuttered across California and the nation, and as millions file for...



more from ValueWalk

Chart School

The Big Short movie guides us to what is next for the stock market

Courtesy of Read the Ticker

There is nothing new in WallStreet, it is only the players that change. Sometimes a market player or an event gets ahead of the crowd and WallStreet has to play catch up.

Previous Post Dow 2020 Crash Watch Dow, Three strikes and your out!

It is important to understand major WallStreet players do not want to miss out on a money making moves.  







...

more from Chart School

Kimble Charting Solutions

S&P Repeating 2000 & 2007 Patterns Almost Exactly?

Courtesy of Chris Kimble

Does History Repeat? Is does rhyme sometimes!!!

This chart looks at the S&P 500 on a weekly basis over the past 20-years.

The S&P declined by 50% during the 2000-2003 bear market. On the week of 3/23/2001, it experienced its first counter-trend rally, which lasted 8-weeks, before the bear market resumed.

The S&P declined by 50% during the 2007-2009 bear market. On the week of 3/21/2001, it experienced its first counter-trend rally, which lasted 8-weeks, before the bear ...



more from Kimble C.S.

Insider Scoop

Economic Data Scheduled For Friday

Courtesy of Benzinga

  • Data on nonfarm payrolls and unemployment rate for March will be released at 8:30 a.m. ET.
  • US Services Purchasing Managers' Index for March is scheduled for release at 9:45 a.m. ET.
  • The ISM's non-manufacturing index for March will be released at 10:00 a.m. ET.
  • The Baker Hughes North American rig count report for the latest week is scheduled for release at 1:00 p.m. ET.
...

http://www.insidercow.com/ more from Insider

The Technical Traders

Founder of TradersWorld Magazine Issued Special Report for Free

Courtesy of Technical Traders

Larry Jacobs owner and editor of TradersWorld magazine published a free special report with his top article and market forecast to his readers yesterday.

What is really exciting is that this forecast for all assets has played out exactly as expected from the stock market crash within his time window to the gold rally, and sharp sell-off. These forecasts have just gotten started the recent moves were only the first part of his price forecasts.

There is only one article in this special supplement, click on the image or link below to download and read it today!

...

more from Tech. Traders

Members' Corner

10 ways to spot online misinformation

 

10 ways to spot online misinformation

When you share information online, do it responsibly. Sitthiphong/Getty Images

Courtesy of H. Colleen Sinclair, Mississippi State University

Propagandists are already working to sow disinformation and social discord in the run-up to the November elections.

Many of their efforts have focused on social media, where people’s limited attention spans push them to ...



more from Our Members

Digital Currencies

While coronavirus rages, bitcoin has made a leap towards the mainstream

 

While coronavirus rages, bitcoin has made a leap towards the mainstream

Get used to it. Anastasiia Bakai

Courtesy of Iwa Salami, University of East London

Anyone holding bitcoin would have watched the market with alarm in recent weeks. The virtual currency, whose price other cryptocurrencies like ethereum and litecoin largely follow, plummeted from more than US$10,000 (£8,206) in mid-February to briefly below US$4,000 on March 13. Despite recovering to the mid-US$6,000s at the time of writin...



more from Bitcoin

Promotions

Free, Live Webinar on Stocks, Options and Trading Strategies

TODAY's LIVE webinar on stocks, options and trading strategy is open to all!

Feb. 26, 1pm EST

Click HERE to join the PSW weekly webinar at 1 pm EST.

Phil will discuss positions, COVID-19, market volatility -- the selloff -- and more! 

This week, we also have a special presentation from Mike Anton of TradeExchange.com. It's a new service that we're excited to be a part of! 

Mike will show off the TradeExchange's new platform which you can try for free.  

...

more from Promotions

Lee's Free Thinking

Why Blaming the Repo Market is Like Blaming the Australian Bush Fires

 

Why Blaming the Repo Market is Like Blaming the Australian Bush Fires

Courtesy of  

The repo market problem isn’t the problem. It’s a sideshow, a diversion, and a joke. It’s a symptom of the problem.

Today, I got a note from Liquidity Trader subscriber David, a professional investor, and it got me to thinking. Here’s what David wrote:

Lee,

The ‘experts’ I hear from keep saying that once 300B more in reserves have ...



more from Lee

Mapping The Market

How IPOs Are Priced

Via Jean Luc 

Funny but probably true:

...

more from M.T.M.





About Phil:

Philip R. Davis is a founder Phil's Stock World, a stock and options trading site that teaches the art of options trading to newcomers and devises advanced strategies for expert traders...

Learn more About Phil >>


As Seen On:




About Ilene:

Ilene is editor and affiliate program coordinator for PSW. Contact Ilene to learn about our affiliate and content sharing programs.