Dummy Variables in Multiple Regression

[@datatab]

If you like, please find our e-Book here: datatab.net/statistics-book 😎

[@Nick-px5tq]

Hah! I loved the n-1 reveal on car type dummy variables. As you were describing the initial 3 I was yelling at the screen "but these are mutually dependent - they break the assumptions!". I laughed at myself when you got to the n-1 reveal 🤣

[@dukeislam6293]

Thank you. You provided the best explanation of "Dummy Variable".

[@swetaroy3533]

It is very good explanation... I'm from India 🇮🇳😊

[@mehdi.sajadi]

thanks a lot, it was useful to deal with non-numerical variables

[@datatab]

Glad it helped!

[@muzahirahmednur5957]

Thanks so much! May Allah Almighty reward you with the best

[@datatab]

Thank you too for your comment! Regards Hannah

[@Rodrigo-lq2iy]

Thank you very much! Really helpful content!

[@datatab]

Hello Rodrigo, many thanks for your Feedback! Cheers Hannah & Mathias

[@simjxin6696]

Both Chicago and NY have two coefficients, but are under one variable "Place". So what does the coefficients mean when inserted into the multiple regression equation? I'm not sure if my question makes sense TT

[@_Anonymous_9]

Thanks. How about if we have 2 categorical variables with 2 levels, and are also interested in an interaction term? (i.e. like a 2x2 ANOVA). What is the process for setting the dummy variables for the interaction term also?

[@datatab]

I am not quite sure, but would say it is done normally. So for both variables simply the categories 0 and 1 generate and for the interaction both multiply, then only 1 comes out if both are one!

[@_Anonymous_9]

@@datatab Thanks for your reply 😊. Yes that works. The problem comes with multi-collinearity after I add the (k-1) dummy variables of the interaction term into a model with the main effects. I can only add 1 level of the interaction term into the model without multi-collinearity problems, not (k-1).

[@xxMegha33xx]

How to choose dependent and independent variable?

[@doof6416]

This was so helpful, thank you!

[@datatab]

Glad it was helpful! Regards Hannah

[@ryanbrink4074]

if there are three places of residence why do we only use two of them? Currently working on a MLR project and am struggling to understand which one to not include as I am using 4 indicator variables.

[@theforester_]

so just a quick question: if my dependent variable (y) is categorical i must perform logistic regression, however when my independent variable (x) is categorical i must create dummy variables. is it correct ? sometimes i get confused by this. thanks! greetings from brazil

[@datatab]

Yes this is correct!!! Regards Hannah : ) Greetings from Austria

[@petercross1879]

@@datatab I need to make 2 box plots. 1 with systolic blood pressure for obesity, 1 for systolic blood pressure without obesity. I have no idea how to determine obesity with bmi of 30 or more.

[@aparajitaswami5509]

@@datatab But what should be done when both dependent and independent variables are categorical?

[@sleepless2541]

​@@aparajitaswami5509logistic regression

[@thatbengaligirl4559]

German for sure. Loved it!!!! :D

[@datatab]

No Austrian : ) Many thanks for you nice feedback, Regards Hannah

[@JustineBoso]

Hi ! Thank you for the video it was very interesting and helpfull. I have a question, how many characteristics we can use for one variable ? Is there a limit ? Thank you !

[@manifestationmaster1111]

If True == 1 in coding, shouldn't yes be 1 not 0?

[@JOWIGAMINGGTA]

Can you perform a bivariate regression with only one dummy variable? How will this look like?

[@datatab]

Yes, for example, whether gender has an impact on salary! Then however the same results come out as if one simply computes a t test!

[@AlvinYakitori060]

How do we interpret coefficients of dummy variables with more than 2 values?

[@asamijaz5459]

apart from goodness of presentation i really loved the accent aswell

[@datatab]

Many thanks : ) Regads Hannah

[@ASAM90]

@@datatab keep up the good work Hannah

[@datatab]

@@ASAM90 Many thanks : )

[@SourovDattacse]

You have a friendly speaking style. Slow and Cute. Very helpful tutorial.

[@datatab]

Thank you! 😊

[@nabuko434]

thank you!

[@zupmutado5612]

kenal dr nizam ko?

[@datatab]

Sorry, understand only german or english : )

[@shahnawazusmani4035]

👍

[@datatab]

Thanks!

[@tronixlkelectronics8277]

1st

[@datatab]

2nd : )

[@ferry6700]

3rd

[@byongwook1]

4th

[@_Anonymous_9]

5th

[@nc375]

@@_Anonymous_9 6th 9ing on yo mamma

[@CreamyDrummer]

Ze reall germanzz

[@datatab]

Where are you from?

[@datatab]

Actually Austria : )

[@noellezoetormin1179]

HAHAHAHA this is the strongest German accent I've ever heard I love it

[@ASAM90]

Yes Austrian accent is very strong. I still remeber Brad Pitt having Austrian accent in 7 years in Tibet

[@SamTuyishime]

You are rushing try to move slowly