Logistic regression : the basics - simply explained
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- Опубликовано: 15 июл 2024
- See all my videos at www.tilestats.com/
In this first video about logistic regression, we will cover its basics by:
1. Compare it to linear regression
2. Show how the probabilities are calculated (05:00)
3. Show how the odds and logged odds are calculated (09:47)
4. Discuss how to interpret the coefficients (15:15)
![Logistic Regression [Simply explained]](http://i.ytimg.com/vi/C5268D9t9Ak/mqdefault.jpg)
The best explanation ever encountered.
Dear Editor of the TileStats series, sincere thanks for this video! I have read and heard many different explanations of the logistic regression model, but never really understood the intuition behind it. This is greatly done, I finally understood the sense of the model. I look forward to see other videos of yours.
Thank you!
Your illustration is easy to understand and also cover all the important point! And the subtitle is extremely helpful for a non native English speakers like myself.
OMG you made it so enjoyable and easy to follow. I re-learned in few minutes what it took me hours over hours to understand reading relevant literature. Thanks a lot
Thank you!
This channel is pure gold. Very clear explanation, thank you.
Thank you!
Thank for the amazing video!!
Many many thanks for this wonderful video with clear explanation!
Thank you!
Amazing video and explanation
You did a great job with your explanation. Thanks a lot.
Thank you!
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We owe you and god bless to u and ur's family.
Thank you!
Amazing and very simple to understand, thanks for this great video :)
Thank you!
thank you so much
Very clearly explained... Thank you 🥰
Thank you!
super fucking clear explanation, I am so glad i learned knowledge from you sir, thank you
Great videos can I have the slides to refer with the transcript
I'm planning to put the lectures as pdfs on my homepage after the summer.
Thanks a lot for this great video!
I understand how we get from probability to odds to log-odds. However, I don't understand what the purpose of this is. In maximum likelihood estimation, we adapt b1 so that the log-likelihood is maximized. But this process does not seem to depend on log-odds, right? Is log-odds only necessary for better intepretation of b0 and b1?
You actually fit a linear model to the data, which explains why the response variable must be expressed as logged odds. See for example this page:
arunaddagatla.medium.com/maximum-likelihood-estimation-in-logistic-regression-f86ff1627b67
@@tilestats Thanks a lot, I really appreciate your response! I have read the article and other articles from the author. However, I don't understand why it is necessary to fit a linear model to the data?
You can fit a nonlinear model to the data, the sigmoid function in this case, but then you have to use nonlinear regression which is not that easy to work with. It is, for example, hard to find the global minimum of the error function for large nonlinear models. I'm actually working on a video about nonlinear regression.
@@tilestats Thank you, looking forward!
How can we estimate the parameters of this model?
Can we just use ols method by using the linear model (b+b1.x)? Which is used as power of "e" here?
No, have a look at this video:
ruclips.net/video/J0yuLu3oLuU/видео.html
Thanks a lot for the videos ... very helpful. Wondering if the data used in this video is available to download to replicate the analysis being done? Thanks
The data is the one you see in the video.
Thanks, I guess I can use the data presented in the tables (middle of the video)@@tilestats
How can this apply to qualitative variables. For instance Im reading an article on how social determinants can affect the probability of an adolescent girl being pregnant, but I don't really get how this can be interpreted. There is for example a determinant called "Age of onset of sexual relations" and there is an "estimate value" that is negative 0. And other values are positive and so on. I don't get it. Help
Let's say that we have a variable gender (men and women). If women are set as baseline (coded as zero), men are coded as one, then the estimated parameter say how much larger, or less, the value of the parameter is for the men compared to the women. If that value is positive, the OR is greater than one. If that value is negative, the OR is less than one (see 18:18 for how to calculate and interpret the OR).
How do you determine the quality of the fitted curve ?
Not sure what you mean with quality but maybe this video might help
ruclips.net/video/J0yuLu3oLuU/видео.html
What statistical software ate u referring to?
I use R and SPSS, but other tools also work fine.
Can u give the exact formula for ur coefficients (b0 and b1) because we badly need it for a manual computation 😭
ruclips.net/video/J0yuLu3oLuU/видео.html
You estimate based on maximizing the likelihood. There is no simple formula to estimate the parameters like in linear regression.
How did you get -5.75 and 2.75 ?
I used the least square formula and I got -0.34 and 0.39 !
You should use the maximum likelihood method.
ruclips.net/video/J0yuLu3oLuU/видео.html
Do you have the slides?
If you go to my home page www.tilestats.com, you can buy some of the vidoes as PDFs
How to calculate b1 and b 0
By the maximum likelihood method:
ruclips.net/video/J0yuLu3oLuU/видео.html
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