ECM - VECM

[1ci]

Dear All!

I hope that somebody can help me :/

My regression is:

lnRpt=ß0 + lnß1Crt + lnß2Ext + ut

where rp = retail price, cr = crude oil and ex = exchange rate

in order to get the relationship between rp and cr I have to run the ECM but what is the difference between standard error correction model and vector correction model? How I can solve this problem?

The next issue is that all series are stationary in first difference, and as I test the cointegration with the unit root test of the residual - I get non-stationary for my residual if I use the Dickey fuller test but stationary if I use Phillip Perron test - so can I assume that my residuals are stationary?

Please help me..

Thank you very much!

[aftab]

standard error correction model and vector correction model? How I can solve this problem?

first is about simple model and later is about more then 2 variables or using matrix form

hoping help you

[1ci]

thx a lot!