Math heads enter

[jpioneer]

Yes, it's homework help but I'm really really stuck with this one (yes, I know I absolutely suck.)

How do I prove this?

(It's covariance if that's not clear)

 

[jpioneer]

Yes, it's homework help but I'm really really stuck with this one (yes, I know I absolutely suck.)

How do I prove this?

(It's covariance if that's not clear)

 

[fenixconnexion.]

i'm not 100% sure but...

cov(X, a) = 0 (covariance property) so maybe the a and b = 0 where as the X and Y remain as X and Y?

 

[fenixconnexion.]

i'm not 100% sure but...

cov(X, a) = 0 (covariance property) so maybe the a and b = 0 where as the X and Y remain as X and Y?

 

[flacobey]

What math do you take?

 

[flacobey]

What math do you take?

 

[jpioneer]

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

 

[jpioneer]

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

 

[popcornplaya]

Here. The evidence with that formula can get kind of long winded, so bear with me.

Spoiler

Spoiler

Spoiler [+]

 

[popcornplaya]

Here. The evidence with that formula can get kind of long winded, so bear with me.

Spoiler

Spoiler

Spoiler [+]

 

[iallan]

Wow, this reminds me of Fall 09, thank God my math days are over. Good luck.

 

[iallan]

Wow, this reminds me of Fall 09, thank God my math days are over. Good luck.

 

[christonic]

Aww shhhhh N that's the new math.

 

[christonic]

Aww shhhhh N that's the new math.

 

[sbrar8]

I'm 12 and what is this

 

[sbrar8]

I'm 12 and what is this

 

[whywesteppin]

Use the middle formula.

Mean(X+a) = Mean(X) + a

Right?

Then plug in for (xi - Mean(X))*(yi - Mean(Y)) with X+a and Y+b so that xi is now xi+a and Mean(X) is now Mean(X) + a

 

[whywesteppin]

Use the middle formula.

Mean(X+a) = Mean(X) + a

Right?

Then plug in for (xi - Mean(X))*(yi - Mean(Y)) with X+a and Y+b so that xi is now xi+a and Mean(X) is now Mean(X) + a

 

[fenixconnexion.]

Originally Posted by JPioneer

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

you sure this is the correct formula? unless youre not providing all the info, you dont have n...
i know that x bar is E(X) which is common in covariance but this looks like a regression formula with the sigma Xi - E(X) and i know that Sxy is common in regression too.

ill be dead honest I'm terrible with proofs, i'm actually doing a stats course right now thats 90% proofs and I'm struggling. it's like proving if this is a markov chain or not smh

 

[fenixconnexion.]

Originally Posted by JPioneer

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

you sure this is the correct formula? unless youre not providing all the info, you dont have n...
i know that x bar is E(X) which is common in covariance but this looks like a regression formula with the sigma Xi - E(X) and i know that Sxy is common in regression too.

ill be dead honest I'm terrible with proofs, i'm actually doing a stats course right now thats 90% proofs and I'm struggling. it's like proving if this is a markov chain or not smh

 

[vendetta]

not a derivative so I can't help ya there

 

[vendetta]

not a derivative so I can't help ya there

 

[jpioneer]

Originally Posted by ElijahDukes

Originally Posted by JPioneer

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

you sure this is the correct formula? unless youre not providing all the info, you dont have n...
i know that x bar is E(X) which is common in covariance but this looks like a regression formula with the sigma Xi - E(X) and i know that Sxy is common in regression too.

ill be dead honest I'm terrible with proofs, i'm actually doing a stats course right now thats 90% proofs and I'm struggling. it's like proving if this is a markov chain or not smh

Yeah I'm positive that's the formula. I don't have more info either.

I'm terrible with proofs too

 

[jpioneer]

Originally Posted by ElijahDukes

Originally Posted by JPioneer

Originally Posted by FlacoBey

What math do you take?

I just started in an economics school.


ElijahDukes, thanks but I need to prove it using the formula

Probably the last part but feel free proving it with the middle part.

you sure this is the correct formula? unless youre not providing all the info, you dont have n...
i know that x bar is E(X) which is common in covariance but this looks like a regression formula with the sigma Xi - E(X) and i know that Sxy is common in regression too.

ill be dead honest I'm terrible with proofs, i'm actually doing a stats course right now thats 90% proofs and I'm struggling. it's like proving if this is a markov chain or not smh

Yeah I'm positive that's the formula. I don't have more info either.

I'm terrible with proofs too

 

[jayswisz]

Originally Posted by Vendetta

not a derivative so I can't help ya there

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