Joint Moment Generating Function Help

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Homework Help Overview

The discussion revolves around the joint moment generating function of two random variables, X and Y, represented as MXY(s,t) = 1/(1-2s-3t+6st) for specified conditions on s and t. Participants are tasked with finding probabilities related to the minimum and maximum of X and Y.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants inquire about representing the joint moment generating function in a product form of two separate moment generating functions. There is a focus on whether MXY(s,t) can be expressed as M1(s) · M2(t).

Discussion Status

The discussion includes attempts to verify the factorization of the joint moment generating function. Some participants express uncertainty about the correctness of their proposed forms, indicating an ongoing exploration of the problem.

Contextual Notes

Participants are working under the constraints of the joint moment generating function's conditions and are exploring the implications of these constraints on their calculations.

wannabe92
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Hi, I've no idea where to go with the question below:

Joint moment generating function of X and Y - MXY(s,t) = 1/(1-2s-3t+6st)
for s<1/2, t<1/3.

Find P(min(X,Y) > 0.95) and P(max(X,Y) > 0.8)
 
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wannabe92 said:
Hi, I've no idea where to go with the question below:

Joint moment generating function of X and Y - MXY(s,t) = 1/(1-2s-3t+6st)
for s<1/2, t<1/3.

Find P(min(X,Y) > 0.95) and P(max(X,Y) > 0.8)

Can you represent M_{XY}(s,t) in the form M_1(s) \cdot M_2(t)?

RGV
 
Ray Vickson said:
Can you represent M_{XY}(s,t) in the form M_1(s) \cdot M_2(t)?

RGV

Is it 1/(1-2s) . 1/(1-3t)?
 
wannabe92 said:
Is it 1/(1-2s) . 1/(1-3t)?

Well, is it? You can answer your own question.

RGV
 

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