# what is the meaning of

• February 2nd 2010, 12:54 AM
transgalactic
what is the meaning of
$f_Y(y)$

f means density function what are Y and y
?
• February 2nd 2010, 01:40 AM
mr fantastic
Quote:

Originally Posted by transgalactic
$f_Y(y)$

f means density function what are Y and y
?

Y is the random variable. And since f is a function, .....
• February 2nd 2010, 01:42 AM
transgalactic
what is y then?
• February 2nd 2010, 01:48 AM
mr fantastic
Quote:

Originally Posted by transgalactic
what is y then?

Well, if I have a function g(x), say, what is x ....? Perhaps you need to go back to revise your pre-calculus work on functions.
• February 2nd 2010, 02:57 AM
CaptainBlack
Quote:

Originally Posted by transgalactic
$f_Y(y)$

f means density function what are Y and y
?

It is the density of the RV Y evaluated at y.

CB
• February 2nd 2010, 03:04 AM
transgalactic
Quote:

Originally Posted by CaptainBlack
It is the density of the RV Y evaluated at y.

CB

i see your words are much closer to what i am looking for

can you say what is RV
why Y evaluated by y

can you give a simple example so it will be clear
• February 2nd 2010, 02:57 PM
harish21
Quote:

Originally Posted by transgalactic
i see your words are much closer to what i am looking for

can you say what is RV
why Y evaluated by y

can you give a simple example so it will be clear

RV means a random vairable

Y being evaluated at y means you are finding the pdf(probability density function) of the random variable!
• February 2nd 2010, 03:01 PM
matheagle
meaning of...
life?
well that's 42.