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Meerkat Statistics
Israel
Registrace 4. 06. 2020
I'm David Refaeli, M.Sc. in Statistics and Data Science from Tel-Aviv University.
I make these videos to really hone topics which I found a bit challenging, and to share this knowledge with others who might struggle like I did.
Mistakes are possible (please comment or send me an e-mail if you believe you found one!).
Paypal.Me: paypal.me/MeerkatStatistics (preferred)
I make these videos to really hone topics which I found a bit challenging, and to share this knowledge with others who might struggle like I did.
Mistakes are possible (please comment or send me an e-mail if you believe you found one!).
Paypal.Me: paypal.me/MeerkatStatistics (preferred)
GAM - Penalized Least Squares
In this video we explore penalized least squares for Additive Models and penalized IRLS for Generalized Additive Models (GAMs). We'll see how using splines and basis expansions can lead to a simpler solution that replaces the backfitting algorithm.
zhlédnutí: 76
Video
GAM - Splines - Natural Cubic Spline, Smoothing Splines
zhlédnutí 89Před 21 dnem
This video focuses on natural cubic splines, which are linear at the edges to reduce variance. We'll see how to derive them from the power-series representation and try to understand the new representation. We'll also introduce smoothing splines and show that natural cubic splines are the smoothest interpolators. Lastly, we'll touch on the use of splines in computer graphics for drawing smooth ...
GAM - Splines - Intro (Polynomials, Piecewise Polynomials, Splines)
zhlédnutí 179Před 28 dny
In this video, we introduce splines, a popular method for fitting nonlinear functions in additive models and GAMs. Splines are a compromise between global and piecewise polynomials, they allow for the function to break at several locations called "knots", which unite different parts of the curve.
GLM vs. GAM - Generalized Additive Models
zhlédnutí 607Před měsícem
Additive and Generalized Additive models differ from LM/GLMs in the way they relate the mean to the x predictors. While G/LMs assume a linear model in x, G/AMs allow for any function approximation that captures the structure between mu (or g(mu)) and x. In this video we will also learn about the backfitting algorithm which is a general method for fitting G/AMs. In a future video we will talk ab...
Regression Diagnostics (2/2) - Generalized Linear Models - Residuals, QQ-plot, Outliers
zhlédnutí 167Před 2 měsíci
In this video we will look at how we can diagnose our generalized linear model fit using residuals, QQ-plots and Cook's distance. We will see how to adjust the residuals and hat-matrix of linear regression to apply also to GLMs. Become a member and get full access to this online course: meerkatstatistics.com/courses... * 🎉 Special CZcams 60% Discount on Yearly Plan - valid for the 1st 100 subsc...
Regression Diagnostics (1/2) - Linear Models - Residuals, QQ-plot, Outliers
zhlédnutí 204Před 2 měsíci
In this video we will look at how we can diagnose our linear regression fit using residuals, QQ-plots and Cook's distance. Become a member and get full access to this online course: meerkatstatistics.com/courses... * 🎉 Special CZcams 60% Discount on Yearly Plan - valid for the 1st 100 subscribers; Voucher code: First100 🎉 * “GLM in R” Course Outline: Administration * Administration Up to Scratc...
GLM - Multinomial Regression (3/3) - Ordinal Data (Cumulative Link)
zhlédnutí 178Před 2 měsíci
In this video we will go in depth about ordinal response (y) data and see how we can model it using the cumulative link approach. Alan Agresti's Book: shorturl.at/aHY79 Gordon Smyth's paper: gksmyth.github.io/pubs/edm-gna.pdf Become a member and get full access to this online course: meerkatstatistics.com/courses... * 🎉 Special CZcams 60% Discount on Yearly Plan - valid for the 1st 100 subscrib...
GLM - Multinomial Regression (2/3) - Nominal Data (Baseline Category)
zhlédnutí 175Před 2 měsíci
In this video we will go in depth about nominal response (y) data, and see how we can model it using the baseline category approach. Alan Agresti's Book: shorturl.at/aHY79 Gordon Smyth's paper: gksmyth.github.io/pubs/edm-gna.pdf Become a member and get full access to this online course: meerkatstatistics.com/courses... * 🎉 Special CZcams 60% Discount on Yearly Plan - valid for the 1st 100 subsc...
GLM - Multinomial Regression (1/3) - Intro
zhlédnutí 255Před 2 měsíci
In this video we will look into multinomial regression, and give an introduction to the topic, including a reminder of the categorical and multinomial distributions. In the next two videos we'll go in depth to the two types of models used for nominal and ordinal response (y) data. Alan Agresti's Book: shorturl.at/aHY79 Gordon Smyth's paper: gksmyth.github.io/pubs/edm-gna.pdf Become a member and...
Is war a war crime? (Israel-Hamas war 6 months analysis)
zhlédnutí 296Před 3 měsíci
Is war a war crime? (Israel-Hamas war 6 months analysis)
Trees - Weights and Feature Importance (Theory + Code)
zhlédnutí 351Před 6 měsíci
How can we incorporate weights into trees? How can we get feature importances? Trees Playlist: bit.ly/MeerkatStatisticsTrees Become a member and get full access to this online course: meerkatstatistics.com/courses/decision-trees/ 🎉 Special CZcams 60% Discount on Yearly Plan - valid for the 1st 100 subscribers; Voucher code: First100 🎉 "Decision Trees" Mini Course Outline: * Course Materials * I...
Accelerated Failure Time (AFT) vs. Cox Proportional Hazards (CoxPH)
zhlédnutí 1,5KPřed 6 měsíci
Accelerated Failure Time (AFT) vs. Cox Proportional Hazards (CoxPH)
2 Examples - Mixed vs. Regular Models
zhlédnutí 608Před 6 měsíci
2 Examples - Mixed vs. Regular Models
Cost Complexity Pruning (Theory + Code)
zhlédnutí 1,7KPřed 7 měsíci
Cost Complexity Pruning (Theory Code)
Build a Decision Tree from scratch using Python (numpy)
zhlédnutí 437Před 7 měsíci
Build a Decision Tree from scratch using Python (numpy)
Decision Trees - Stop Criteria, Categorical Data, NA's, Implementation
zhlédnutí 221Před 7 měsíci
Decision Trees - Stop Criteria, Categorical Data, NA's, Implementation
Quantile Regression - Numerical Solutions
zhlédnutí 1,1KPřed 7 měsíci
Quantile Regression - Numerical Solutions
Israel vs. Palestine - The October 7 Massacre
zhlédnutí 734Před 8 měsíci
Israel vs. Palestine - The October 7 Massacre
Survival Analysis - Cox PH - Breslow Estimator
zhlédnutí 681Před 10 měsíci
Survival Analysis - Cox PH - Breslow Estimator
Survival Analysis - Cox PH - Partial Likelihood
zhlédnutí 1,4KPřed 10 měsíci
Survival Analysis - Cox PH - Partial Likelihood
Survival Analysis - Cox Proportional Hazards
zhlédnutí 892Před 10 měsíci
Survival Analysis - Cox Proportional Hazards
SEM - Code example in R (lavaan package)
zhlédnutí 850Před rokem
SEM - Code example in R (lavaan package)
Ah! Finally a good and to the point explanation after searching so much on CZcams. Thankyou! You have a new subscriber now.
Beautiful presentation. So clear and informative!
There are some mistakes in your notes
can you point them out?
@@MeerkatStatistics sure. At 3:05, the joint distribution should be written in terms of the transformed variables as p(x,ξ)p(x,ξ), assuming T(θ)=ξT(θ)=ξ is your transformed variable. I don't blame you, as in the paper, the authors omitted a small detail in writing the ELBO of the original variable as the ELBO of the new one
I love this, thank you! Very clear explanation.
Thanks for introducing GAM, need you watch several times to understand
Gauss didn't invent the linear model; he just claimed to a decade after someone else had. The same is true for Gaussian elimination. Newton invented it, and then Gauss decided to name it after himself.
Loving the spline / GAM series, thank you!
First, the conflict did not begin on October 7th. You have been oppressing Palestinians since your illegal occupation, starting with the massacre of Karbala. You take pride in the killing of thousands of children since then. You even bombed a civilian camp where you told people to go to suffer less, only to slaughter them in the middle of the night. How dare you, coward.
Very clear and concise! Looking forward for the follow up video
So much information compiled together wonderfully in this video.Hope you come up with more such videos on individual methods with some examples.
IMHO, symmetrical or not, the mean is still your expected value. If you want to minimise error, you can only work with the expectation, since that's what you can expect. If you optimised for something else, you may use the mode or whatever else that fits the optimization.
What is the difference between denoting p_theta (x|z) vs p(x|z,theta) ?
I think "subscript" theta is just the standard way of denoting when we are optimizing theta, that is we are changing theta. While "conditioned on" theta is usually when the theta's are given. Also note that the subscript theta refers to the NN parameters, while often the "conditioned on" refers to distributional parameters. I don't think these are rules set in stone, though, and I'm not an expert in notation. As long as you understand what's going on - that's the important part.
@@MeerkatStatistics got it, thanks!
Just wanted to say Thank You !!! Very well explained & so much intuitive 👍
at 3:30 , i dont understand why ez1 + ez2 + ez 3 = 1 can someone please explain? thanks
because they are also divided by the exact same number... so it turns into 1.
@@MeerkatStatistics oh 🤦♀🤦♀duh. Thanks
Great vid. Can you please share that notebook ?
for question 1 : it won't be a problem and the network will learn normally because the inputs to the neurons will not be zero or constant since we initialized the weights to be random so the biases will get updated normally. for question 2 : since the inputs to the network are different the deriviative of the output with respect to the wight will not be constant or zero so this weights in the first layer(input) will be updated normally.
Thnak you so much , very good explanation
This video is everything I asked for! Thank you so much, Meerkat!
thank u so much brother
thanka man
do you have any more tips and tricks for regular linear models?
very useful video for practitioners
many thanks for the lecture. we all the time need to know how the factors are calculated from the variables. but how come the factors and their loading can be calculated given that the only given data is the variables? x1=l1f1 + l2f2 + l3f3
Islam always brings hate and war!!
Wow, will you cover nested logit model? And relationship with gev or vglm
Thank u so much!
I was always perplexed by the two different views of seeing linear regression as a fixed viewpoint and a random viewpoint. Now everything is clear: the two viewpoints correspond to the OLS and MLE methods. What a wonderful explanation you provided!
It is the best lecture that I have watched on CZcams. Thanks.
When I run the code with corstr = "AR-M", Mv=1, it shows error message "VC_GEE_covlag: arg has > MAX_COVLAG rows". I don't know why it is
Le monde made a great video too : 60 % des écoles, hôpitaux et mosquées détruits ou endommagés. There are subtitles
czcams.com/video/soQ-VlaHt88/video.html
Hi! Really helpfull video, I loved it. However, I still don´t really undertand how the AFT model works. I desperately need to comprehend it because I am doing a proyect about it and I have to finish it in order to finish my degree. Could we contact somehow in order for you to explain me the model? I am Spanish so sorry if there are spelling mistakes. Thank you very much!
I can give you a private class. Contact me via david@meerkatstatistics.com
Could you please tell me if there is a mistake in the notation? @8:26 z_{i} = z_{l}?
Hey, yes of course. Sorry for the typo.
@@MeerkatStatistics Thank you so much) Great video!!! 🔥
Israel propaganda. UNRWA is a UN organization that was forbidden to work in Gaza. World Kitchen organisation is targeted. You're mis-translating the women statements.
Genocide is a machine that dehumanize people and seek their killing or forcible move from their land. If Israel kills 1 million Gazans that is called a holocaust. By the way, Palestinian fighters are not hiding behind civilians. They fight in so-called secure israeli areas. But it is Israel that uses Palestinian as human shields. Rape, starvation, and killing palestinians for fun are widespread. No hospitals, no schools, no buildings, no electricity, no water, no worship buildings in Gaza.
Israeli propaganda. Do not repeat Israel lies and false statistics.
Imagine thousands of people in your time being killed and people put out videos like this trying to justify those killings as not being a big deal enough to be considered within their benchmark of what's considered a genocide or not.
Yeah, war is tragic. But can we at-least admit that it's not a genocide? Imagine your enemy slaughtering entire villages, then when you attack back uses propaganda tools to try and convince the world that it's actually your fault, because you're an "apartheid state" that commits "genocide", in order to put world pressure on you to stop the war, and let them stay in power, just so they can attack you again in the future. Do you think this will stop the conflict? Do you think this will not lead to more thousands of dead?
So good, I am familiar with 20% here. Probability, Statistics,Algebra of Random Variables, and Time Series Analysis.
Thanks for speaking facts.
Radical islam is always a trouble, the basic point is - Israel has a right to defend themselves, war is inevitable if the atrocity as for this particular war started by Hamas. So why cant they defend themselves?
it is, but islam had been long almost dead until the early 19 th century. the existence of Israel resurrected the religion. We could have had a world without islam growing anymore, but Israel made sure it never dies because its existence depend entirely on the existence of Islam as the greater evil in the region. In a world without Islam, why would anyone support the existence of Israel?
Is this video actually real?
😂😂😂- Joker or just Inhumane
I agree that you are the hero’s of false justifications
🥱🥱
Facts are facts! Thank you!
Will it still not be genocide if Rafah is invaded, where _millions_ of Palestinians are packed into an area where any military offensive will _guarantee_ mass civilian casualties?
I think the definition of Genocide must include intent. Does Israel want to kill millions of Palestinians? Or can the Palestinians solve this easily by releasing the hostages? Israel has plans to evacuate the civilian population there before the strike. And so hopefully the civilian casualties will be minimized. But I also hope it won't get to that... and that a cease-fire deal will be made now. I think it's the last chance. Too bad the world puts zero pressure on the Palestinians and full pressure on Israelis.
שאפו ענק ❤
אמת צרופה - השקר הפלשתיני שמרמה את העולם שוב ושוב ושוב - והפתאים מאמינים להם ולא יודעים שהם הבאים בתור
Excellent manifestation of the ancient hypocrisy. The world against the Jews.
At 5:45, I forgot to mention that for Israelis - the ratio for this war is 2.5:1. That is 2.5 civilians have died for every soldier.
Are you deleting comments that disagree with your view? Apparently, you found them convincing then.
@@rp7390I didn't delete any messages, but CZcams is weird.
@@RealMcDuduit is, fair point (assuming you're the same person as the channel owner)