http://financemetrics.scienceontheweb.net Maximising the value of a portfolio. Calculating #Variance, #CoVariance and portfolio Variance using the magic of Matrix Algebra. Calculations feature 5 ftse stocks, BP, Vodafone, UU.L, Tesco and Morrison. Detailed exposition leads one through x transpose multiplied b x. #MatrixAlgebra
#variance
Weighting an Average to Minimize Variance
https://www.johndcook.com/blog/2025/11/12/minimum-variance/
#HackerNews #Weighting #Average #Variance #Minimization #Statistics #DataScience
🎰 Slot Volatility: The Mood Swings of Your Favorite Games
💵 Low volatility (Variance) is the chill friend who buys you coffee every day.
💰 Medium 𝘃𝗼𝗹𝗮𝘁𝗶𝗹𝗶𝘁𝘆 is the buddy who surprises you with a nice dinner once in a while.
💎 High volatility is the wild cousin who shows up once a year and hands you a lottery ticket.
High volatility might just make your day (or break it). 👉 Full guide: https://casino.men/slots-volatility.html
#Casino #Volatility #HighVolatility #Variance #Gambling #Slot #Tips
#statstab #393 Statistically Efficient Ways to Quantify Added Predictive Value of New Measurements [actual post]
Thoughts: #392 has the comments, but this is where the magic happens.
#modelselection #modelcomparison #variance #effectsize #tutorial
In case anyone's keeping score, the idea that JFETs have hugely variable properties and that this problem cannot be - or at least has not been - fixed with different design or manufacturing practices, this batch showed it pretty clearly to me.
20 J113s, minus 1 fake, equals 19 devices. I measured the Vgs / pinch-off voltage and the Id / drain current in my test rig. The result?
6 very distinct bins with between 2 and 6 devices in each. Vgs overall varied from (-) 1.30 V to 2.11 V (variance is 38% of the larger value, or 62% of the smaller...), and Id from 5.7 mA to 12.8 mA, a spread of 125% (!) of the smaller value.
No wonder so many JFET circuits just don't work if you don't hand-match the devices.
#variance #variability #characteristics #measure #measurement #match #JFET #tolerance
A quotation from Nassim Nicholas Taleb
Don’t cross a river if it is four feet deep on average.
Nassim Nicholas Taleb (b. 1960) Lebanese-American essayist, statistician, risk analyst, aphorist
The Black Swan, Part 2, ch. 10 “The Scandal of Prediction” (2007)
Sourcing, notes: wist.info/taleb-nassim-nichola…
#quote #quotes #quotation #qotd #blackswan #assumptions #average #danger #expectations #mean #variability #variance
🧵
> ... de Moivre's equation in action. The variation of the mean is inversely proportional to the sample size, so small counties display much greater variation than large counties. A county with, say, 100 inhabitants that has no cancer deaths would be in the lowest category. But if it has 1 cancer death it would be among the highest. Counties like Los Angeles, Cook or Miami-Dade with millions of inhabitants do not bounce around like that.
@bsmall2@writing.exchange
#StatisticsClass #Variance #EstimatingMeans
Play list Puntata n. 11 di Domenica 16 Marzo 2025 https://www.radiocittafujiko.it/play-list-puntata-n-11-di-domenica-16-marzo-2025/ #DenieleDeGregori #ClathrusArcheri #CristianMarchi #DeniseOrlandi #EmilyRinaldi #Meganoidi #PLAYLIST #Gabriele #gazzelle #Santeria #Variance #Ascanio #freccia #Gustavo #MUSICA #T-Pam #Aua
Mild success can be explainable by skills and labor. Wild success is attributable to variance.
Nassim Nicholas Taleb (b. 1960) Lebanese-American essayist, statistician, risk analyst, aphorist.
Fooled by Randomness, Part 1, ch. 1 (2001)
Sourcing, notes: wist.info/taleb-nassim-nichola…
#quote #quotes #quotation #odds #chance #average #goodluck #hardwork #labor #luck #skill #success #variance
Quality Humor - While variances can be a very bad thing to have in certain industries, don't go crazy with the control put in place where it is no longer what is what the client/customer wants. #variance #quality #process #humor #control
#statstab #265 The limited epistemic value of ‘variation analysis’ (R^2)
Thoughts: Interesting post and comments on what we can and can't say from an r2 metric.
#stats #r2 #effectsize #variance #modelcomparison #models #causalinference
https://larspsyll.wordpress.com/2023/05/23/the-limited-epistemic-value-of-variation-analysis/
#statstab #239 Why Full, Partial, or Approximate Measurement Invariance Are Not a Prerequisite for Meaningful and Valid Group Comparisons
Thoughts: Item loadings should be the same across groups. This is v important & also ok if not 🤷🏼♂️
#psychometrics #variance #itemloading #invariance
https://www.tandfonline.com/doi/full/10.1080/10705511.2023.2191292
Bloomington BZA notebook: Variance OK’d for 5-story downtown condos, Duplex case delayed again
9 flagpoles now legit for Elks after action by Bloomington board of zoning appeals
#python #algorithm #investment #portfolio #optimization
#scipy vs #montecarlo
min #variance
max #sharpe ratio
#gold #btc #oil #eurusd
Risk-Adjusted BTC-Gold-Oil- EURUSD Portfolio Optimization for Quant Traders: AutoEDA, Scipy SLSQP, Markowitz, Sharpe & VAR
Bloomington withdraws appeal, BZA to re-hear request for Kirkwood condo groundfloor variance
#Variance #BZA #BloomingtonIN #Development #Groundfloor #CourtofAppeals
🤔 Invariance, Covariance, and Contravariance in .NET C# 🤷♂️
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Invariance, Covariance, and Contravariance in .NET C#
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