How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Linda
Hi! I have some experimental data collected and can be grouped into 2 variables, X and Y. One is the dependent variable (Y) and the other is an independent variable (X). What test shall I made to check whether there can be expressed as independent or not?? Thanks.. Linda =

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Vadim and Oxana Marmer
You can start with checking if they are correlated. It's simpler to do. If you find that they are correlated then you have the answer to your question. If you find that they are uncorrelated and you have a reason to believe that they may be not independent anyway then you can look for more advance

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Chia C Chong
"Vadim and Oxana Marmer" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > You can start with checking if they are correlated. It's simpler to do. If > you find that they are correlated then you have the answer to your > question. > If you find that they are unco

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Rich Ulrich
On Wed, 20 Feb 2002 19:30:19 -, "Chia C Chong" <[EMAIL PROTECTED]> wrote: > > "Vadim and Oxana Marmer" <[EMAIL PROTECTED]> wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > You can start with checking if they are correlated. It's simpler to do. If > > you find that they are

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Chia C Chong
"Rich Ulrich" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > On Wed, 20 Feb 2002 19:30:19 -, "Chia C Chong" > <[EMAIL PROTECTED]> wrote: > > > > > "Vadim and Oxana Marmer" <[EMAIL PROTECTED]> wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]..

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-20 Thread Glen Barnett
Linda <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Hi! > > I have some experimental data collected and can be grouped into 2 > variables, X and Y. One is the dependent variable (Y) and the other is > an independent variable (X). What test shall I made to che

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-21 Thread Vadim and Oxana Marmer
There is a test based on nonparametric density estimates. You can estimate joint and marginal densities by nonparametric methods and then test if f(x,y)=f(x)f(y). You can find some details and references in Pagan & Ullah "Nonparametric Econometrics". On Wed, 20 Feb 2002, Chia C Chong wrote: > >

Re: How to test whether f(X,Y)=f(X)f(Y) is true??

2002-02-21 Thread Rich Ulrich
On Wed, 20 Feb 2002 22:21:38 -, "Chia C Chong" <[EMAIL PROTECTED]> wrote: [snip, various discussion before] > > I have an example of data of 2 RVs. When I tested the correlation between > them, by simply find the correlation coefficient, it shows that the > correlation coefficient is so smal