Why is Y a Convolution of X1 and X2 PDFs?

In summary, a convolution of PDFs is a mathematical operation that combines two probability density functions to create a new PDF. It represents the distribution of the sum of two independent random variables and is calculated by taking the integral of the product of the two PDFs. This operation has various applications in fields such as statistics, signal processing, and machine learning. However, it is only applicable to independent variables and may not work for non-independent variables.
  • #1
reddvoid
119
1
if X1 and X2 are two uniformly distributed random variables
and if Y = X1 + X2
why is that the probability density function of Y is convolution of probability density functions of X1 and X2 ?

I tried many ways, I'm not able to get at this conclusion
 
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  • #2
http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/Chapter7.pdf

See Theorem 7.1, just after the start of section 7.2.
 

Related to Why is Y a Convolution of X1 and X2 PDFs?

1. What is a convolution of PDFs?

A convolution of PDFs is a mathematical operation that combines two probability density functions (PDFs) to create a new PDF. It represents the distribution of the sum of two independent random variables.

2. Why is Y a convolution of X1 and X2 PDFs?

Y is a convolution of X1 and X2 PDFs because it represents the probability distribution of the sum of two independent random variables, X1 and X2. This is applicable in many real-world scenarios, such as the sum of two measurements or the sum of two independent events.

3. How is a convolution of PDFs calculated?

A convolution of PDFs is calculated by taking the integral of the product of the two PDFs over all possible values of the random variables. This integral results in a new PDF that describes the distribution of the sum of the two variables.

4. What are the applications of convolutions of PDFs?

Convolution of PDFs has many applications in fields such as statistics, signal processing, and machine learning. It is used to model the sum of random variables in various experiments and can also be used to filter and analyze signals in signal processing.

5. Can a convolution of PDFs be used for non-independent variables?

No, a convolution of PDFs is only applicable to independent variables. If the variables are not independent, the sum of their distribution may not follow the convolution formula and may require a different approach for modeling their combined distribution.

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