These are really simple to understand videos and I love to watch them any chance I get. I always feel like I am getting worth my time.

Where did the 14 over 3 come from?

@emeraldkillr803

Жыл бұрын

Slope it's the the shops so the formula is Y-hat=a+bx a=Y-intercept bx=Slope

@ginkgoginkgo2790

7 ай бұрын

That’s the gradient. y2-y1/x2-x1

The take away message: "The way that we calculate this regression lines is all about minimizing the square of these residuals". Of note, residual is the difference between the actual value (y) and the estimated value (ŷ).

WHERE DID THE -140 COME FROM AND WHERE DID THE 14 OVER 3 COME FROM???????????/ GIVE ME ANSWERS

@Rifraf94

3 жыл бұрын

Asking myself the same questions.

@Rifraf94

3 жыл бұрын

I don't know how to get the value-based off the video but here is the definition of the y intercept,. y intercept is the value of y when x = 0. For the line y = a + bx, y-intercept = a. If you look at the line it does look like -140 would where the y-intercept is. How he got it though, I have no idea.

Where did you get the equation for -140 and 14/3?

@patricktan98

2 жыл бұрын

take 2 points of the linear regression and calculate its slope (gradient) which is 14/3 but thats not the main purpose of this video so he just gave the answer directly and once u have the slope (gradient), substitute x = 0 into your linear equation to find the estimated y intercept which is -140

@SuperOnlyP

2 жыл бұрын

a form of line : y = m*x + b m: is the slope or how steep the line is b: where the line cut y-intercept the steepnesss as rise/run: x-intercept at 30. Take 30 + 3 = 33 as run and go up 14 as the rise => get the triangle with the hypotenuse as the steepness the line will cut y at : -140 as y-intercept This is just an example to illustrate the idea the best fit line which will have the least residuals or sum of errors. By giving us the anwser and compare each data points to the best estimated line If you go further to the course, he will show you the way to find m , b or 14/3 , -140

your videos are very nice , thank you a lot for the extra knowledge

Perfect thanks!

This is actually fun.

Now I know what a linear regression is 😃

I have a doubt, how is the y' value is -140

Khan Academy really prepares everything for my ap course...😅

Too good man...

We minimize squared error for two reasons: 1. Square is always positive. We are only interested in absolute value of errors in each point. 2. Derivative of x^2 can be easily calculated: (x^2)' = 2x.

Great

Bro I got a 2 on the AP Calculus exam but I am for sure getting a 5 on this.

@TrueMose

3 ай бұрын

bro im probably gonna be the opposite 😭😭

Are we just supposed to automatically know where the "-140 +14/3" came from? Pretty sure that little bit of info would be helpful.

@aprilgarcia5589

9 ай бұрын

no fr i have no idea where that -140 and 14/3 came from

What device do you use to make these videos?

how to get the complete playlist? Can't find it.

Where did -140 +14/3 come from? I am confused.

cool its just that i got my exam the day after tomorrow. too bad there isn't more content on this topic. 😅

@lukemichael6906

3 жыл бұрын

how did it go?

Hello Sal from Germany, please make excel or accounting playlist or something new related to Economics :)

ahhh ok

The material you provide is "ok". Some things could have been improved such as not saying the Y for this particular intercept is -140. Instead show how you got -140.

still didnt get it

fractions make it difficult to understand,

انا عربي ولا افهم كلامك

@muhammedthameem3016

5 жыл бұрын

محمد علي Mohamed Ali ادرس الإنجليزية اخي

If you are comparing height vs weight, then shouldn't the unit be in Newton as oppose to lb?

This is exactly why I hate math. Math teachers always just expect you to know certain aspects and don’t explain anything thoroughly. Where in the heck did the -140 and 14/3 come from??? And does anyone know where might be a better place to start learning if I’m having trouble understanding the equations??