#40 Transformations: Distribution of a function of a discrete random variable
Probability mass function (pf) of a function of a random variable that follows a binomial distribution. Discussion of method, and applicability to functions that are a 1-1 mapping, and not 1-1. ... https://www.youtube.com/watch?v=JiQbKB_Mrz0
Interpreting the coefficient in the Cox proportional hazard model with nominal covariate
Example: Hosmer and Lemeshow, Chapter 4.
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https://www.youtube.com/watch?v=nSay4TW65dw
I show you the proof. It's quite a long video as I take my sweet time over things. Can't believe it took over 20mins - wouldnt have that kind of time in class.
I kinda like this proof cuz it revisits some of the techniques I have shown in previous videos.
The hardest bit about the proof is dealing with double summation, and that's what makes this video long. If you already have watched my video on doing double summation in 7mins, then you only need to watch parts 1 and 2 of this video.
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https://www.youtube.com/watch?v=4Zmhe45EHCI
You leave a space after a question for a response. This type of question is an open ended question. Why would you want to pose an open ended question, and how does one go about entering data for open ended questions?
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https://www.youtube.com/watch?v=KJO7mtsc8Rg
Subject: Statistics
Level: newbie
Proof of mgf of exponential distribution and use of mgf to get mean and variance
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https://www.youtube.com/watch?v=bEPTUrfknQ4
Keywords: Suppressor, SPSS
"There is no correlation between the two variables (DV and IV), but, then, using the same variables, the regression equation shows a relationship between the two, hence the ability to predict. Is that possible with the same data? Or am I missing the point (that's fairly likely!)?
Answer: Suppressor variable
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https://www.youtube.com/watch?v=s5KBiMOXlYQ
Still on the lottery example, I show you a common answer I see in homework. The method is by multiplying probabilities. I wonder how many of my students know they are multiplying conditional probabilities.
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https://www.youtube.com/watch?v=FJZLCBidDx0
Predictions with the simple/bivariate regression model
-scatterplot
-how to run a simple regression
- ways to obtain predictions
- difference between predictive interval and confidence interval
- prediction and extrapolation
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https://www.youtube.com/watch?v=b_32VfHbdxc
Two basic results (formula) on matrix differentiation used in statistics, econometrics, and economics presented with simple proofs.
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https://www.youtube.com/watch?v=xTajlZF_Sm4