Thanks for your very didatical demostration. I was wondering why you didn't mentioned about the data transformation and the data standarlization previous start the analysis, mainly because the blood preasure and body size have distinct scales.
@tilestats2 күн бұрын
Yes, you can standardize the data but you will get the same correlations with un-standardized data because you later on instead standardize the scores as I explain at 10:56.
@sakkariyaibrahim26504 күн бұрын
Great. After wandering through hundreds of video now I know what an Eigen vector and Eigen value is👍
@stonecastle8585 күн бұрын
Excellent explanation, thank you
@ogbonnaya10045 күн бұрын
Thank you, bro. Well explained. Love it😊
@sofiatrifonova58607 күн бұрын
Pairrrrssss 🥸 pehrz 😌
@user-yp1rg2jr5z8 күн бұрын
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?
@tilestats8 күн бұрын
No, have a look at this video: kzbin.info/www/bejne/gGHcpn-raNR_q7c
@VivekGupta-sh3lj9 күн бұрын
Huge thanks Can we say the pseudo-r-square is the same as deviance ratio that is reported in some statistical packages after logit models
@user-yp1rg2jr5z10 күн бұрын
But why call it poisson regression where the graph you used is clearly follows a exponential distribution?
@tilestats10 күн бұрын
Because the data points around the fitted curve follow a Poisson distribution.
@Winbugs111 күн бұрын
Very nice explanation
@AMADIGIFT-ui8ud13 күн бұрын
This is so great. You're a good teacher, you explained what I have been trying to understand for more than a year in less than 30 minutes. You just got a new subscriber.
@user-yp1rg2jr5z14 күн бұрын
Please make about linear approximation method before applying Least squares method.
@nguyentungle218315 күн бұрын
Your videos are great. You know that your video are one of learning materials for Statistics course in University of Groningen right? Much thanks
@tilestats15 күн бұрын
No i did not know that but it is great if it is useful.
@ritiksuri724815 күн бұрын
Can you please provide the dataset on which you worked
@tilestats15 күн бұрын
The data set is the same as shown in the video.
@richardgordon15 күн бұрын
Thank you for such a well explained video on Bootstrapping! Really impressive and clear!
@MrAwm-ki6jb16 күн бұрын
Really easy to understand. Cause you explain the reason why. Where i can't get this from my teacher.
@georgeyandem862916 күн бұрын
You are the best in my opinion. And I'm not bluffing
@veniasblack17 күн бұрын
Amazing explanation. Thanks alot
@flexogore461417 күн бұрын
What if the correlation coefficient equals to 1? In that case we would receive 0 in denominator under the square root sign. Overall, thanks a lot for this insightful course
@tilestats17 күн бұрын
True, then the t-stat will be infinity large.
@flexogore461417 күн бұрын
@@tilestatsgiven we can't divide by 0, is it then replaced by some default infinitely small number?
@minhhai431818 күн бұрын
this video is a gem .
@stephensonal408218 күн бұрын
Hi, you lost me for a moment at 5.42/13.11 where you calculated upper and lower CL - could you please layout further, how you achieved 43.37
@stephensonal408218 күн бұрын
Sorry revisited and got my answer- thx
@olalekeoluwaseyi944920 күн бұрын
Wow, this is awesome and very insightful I must subscribe to your channel
@learning_with_irving426620 күн бұрын
How are the 2.747 and 5.7 derived?
@tilestats19 күн бұрын
That is explained at 11:30 and forward.
@khaingzar313620 күн бұрын
Which software is used to get the equation for model Price = constant + Age.Coefficient + Mileage.Coefficient ?
@tilestats19 күн бұрын
You have to create the equation on your own and then use the software to estimate the parameter values for the equation. I use R but you can use any other statistical software to get the same parameter values.
@mayling101422 күн бұрын
Thank you for the detailed explanation! 1:12 May I know if both adjusting the significance level and adjusting p value result in the same conclusion, how do we decide which one to use? I see most of the papers use adjusted p value...
@tilestats22 күн бұрын
You will come to the same conclusion. In a paper, it might be confusing if you use different significance levels in different test. It is therefore easier if you use just one alpha (usually 0.05) and adjust the p-values.
@mayling101422 күн бұрын
@@tilestats Understood :) Thank you so much for your prompt reply. May I ask 2 questions? 1) Is the term "FDR adjusted p-value" interchangeable with "q-value"? 2) For RNA sequencing, I have significant DEGs when using p<0.05, but no significant DEGs when using adjusted p <0.05. Can I still use p value in order to get DEGs for downstream biological annotation?
@tilestats21 күн бұрын
FDR adjusted p-values usually refer to BH adjusted p-values or q-values. To see the difference, watch this video: kzbin.info/www/bejne/imetZZVjjLyYmK8 You can still use, for example, GSEA with a ranked gene list based on log2FC as I show in this video: kzbin.info/www/bejne/e3ecZaqGltaLg5I
@Mathclub6322 күн бұрын
Absolutely ❤❤❤❤
@fallenangel878523 күн бұрын
One of the Most underrated channels in KZbin
@surendrabarsode895923 күн бұрын
Very well explained. Anyone can easily very well understand these concepts. Thanks!!!
@miguelchiri889523 күн бұрын
What book can I find this in?
@tilestats23 күн бұрын
I have not used any book but you can buy most of the videos as PDFs on my home page: www.tilestats.com
@miguelchiri889523 күн бұрын
@@tilestats I'm looking for bibliographic references on this topic but so far I haven't been able to find any. :(
@ast336223 күн бұрын
6:57 I don't understand how we can now assume that the Groups have one random intercept. That would mean each group has their own distribution, which is not the case because as you said all 4 subjects are randomly sampled out of one distribution.
@tilestats23 күн бұрын
When we include Diet in the model, we can test if the two groups have different intercepts. Thus, we then no longer assume that all individuals are sampled from the same distribution.
@ast336222 күн бұрын
@@tilestats thanks! I just realised the difference between groups and clusters. Now everything is clear!
@CalzOmon23 күн бұрын
Amazing! Thanks so much
@dawitmusse354824 күн бұрын
At 11:00 how are the weights optimised, please?
@tilestats24 күн бұрын
Have a look at this video, where I explain how the weights are optimized: kzbin.info/www/bejne/jqm9YXWfl7KHoNk
@dawitmusse354823 күн бұрын
@@tilestats Thank you so much, sir!
@lorenzotagliari669925 күн бұрын
I did not understand why the cutoff od 0.001 would not be appropriate in cases when we have many datapoints. Could you clear this up for me?
@tilestats24 күн бұрын
Because, 0.1% of the data points will be outside the ellipse due to chance. If you for example have 1 million data points, you should expect that 1000 are outside the ellipse, right? It would then not be appropriate to define all these as outliers.
@sridharr202525 күн бұрын
Very useful video, thank you
@psychologykaTopper26 күн бұрын
In my research, there are two groups: control and experimental. Both of these groups gave pre- and post-tests. Which test should I use? In the experimental group, there are 100 people,50 male, 50 female and in the control group, there are 100 people.50 male, 50 female, Could you please explain how to calculate the mean and standard deviation for this large sample? Thank you!”
@tilestats26 күн бұрын
You can use an unpaired t-test between exp group and control group based on the differences between pre and post test.
@psychologykaTopper25 күн бұрын
@@tilestats thanku so much, If my population is larger, do I still need to use a paired t-test over a z-test?
@tilestats25 күн бұрын
Z-test is generally only used if you know the population variance (which is usually not the case). For a large sample size, the Z-test and t-test will result in about the same p-value.
@psychologykaTopper24 күн бұрын
@@tilestats thanku so much.
@user-yp1rg2jr5z27 күн бұрын
Here , 'Binom(6,8,p)' is this a likelihood or conditional distribution of x given parameter? [ f(x | p) ] I think both are same 🙂 or I don't know.
@tilestats26 күн бұрын
It is the likelihood. When you are trying to estimate the parameter p based on observed data (6 successes out of 8 trials), you are using it as a likelihood function. You may watch this video to get a better understanding: kzbin.info/www/bejne/hoPTnnRsjNiMbMk
@stevencaramoy204329 күн бұрын
Such good explanation for the beginner like me
@morielgenish6515Ай бұрын
thank you! if i want to calculate a confidence interval at other confidence levels, for example 98%?
@tilestats29 күн бұрын
Then you just use 98% instead of 95% in this video.
@FranciscoLozano-ov3zsАй бұрын
nice video! how do you do the log-rank test when you have several groups? in my particular case i have 13 groups. what can i do to reduce the family wise error rate?
@tilestats29 күн бұрын
If you want to do many pairwise comparisons, you can adjust your p-values by, for example, Bonferroni: kzbin.info/www/bejne/apC5Y6BqZtujkNk or Holm's test: studio.kzbin.infol4yVt_Dht4U/edit
@harkatiyoussef9994Ай бұрын
by far one of the best, to not say the best explained on this subject (without exaggerating)
@gd8109Ай бұрын
Your videos give the best explanations! You make it so clear and easy to follow. Thank you!
@a.mo7aАй бұрын
why using 2 output nodes? isn't P(healthy) equal to 1-P(cancer)?
@tilestatsАй бұрын
True, you can use just one output node when you predict just two categories. The R code I provided generates two output nodes but if you try TensorFlow in Python, it will use just one output if you set loss='binary_crossentropy'.
@a.mo7aАй бұрын
@@tilestats Thanks for the clarification
@rema2769Ай бұрын
Thank you so much, this is really helpful I finally understand now 24hr before my final
@anmolpardeshi3138Ай бұрын
I see that you centered the data. Is only centering required for "standardization" or scaling is also normally done such that the mean =0; standard deviation=1? this will then change the covariance matrix since variance of individual dimensions will equal 1.
@tilestatsАй бұрын
It is not a requirement, mathematically, to standardize your data (mu = 0, SD = 1), but it is highly recommended, especially if you have variables with a large difference in the variance. I discuss that in the next video about PCA: kzbin.info/www/bejne/mpmbkoeBjbV-orc
@branokrajcovic8863Ай бұрын
excellently explained
@user-pc5ux8rt7vАй бұрын
Inquiry: If I had one group of males and females, and I applied treatment to them and took three measurements If the conditions for a t-test are present, use a two-sample t-test to test the treatment difference between males and females in each measurement Secondly, it is possible to use a repeated-measures test to compare the effect of treatment on males in repeated measurements I repeat this again for females
@tilestatsАй бұрын
You could do that but a better alternative is to used a mixed two-way ANOVA: kzbin.info/www/bejne/b6qsoJWIp790r8k kzbin.info/www/bejne/hHywd5qbn9lmi5I so that you also can check if there is an interaction.
@user-pc5ux8rt7vАй бұрын
@@tilestats how can i check if there is an interaction
@meshackamimo1945Ай бұрын
the best explanations for regression and neural networks to a non-expert statistician. thanks for posting