st: ADF test for seasonaly data

["adam dvir" <adamdvir@hotmail.com>]

Hello everyone,

I have a seasonally data of prices and quantities of Avocado export to 
Europe, that I want to check for stationarity using DF or ADF tests.

the problem is that my data is not continuous, and includes only the monthes 
october to April (7 monthes), when the other monthes are blank (missing 
values). When I use the ADF regression (with only 1 lagged diference), I 
automatically lose 36 obs. of my 123 obs., because of the data's missing 
monthes (I have obs. for 18 years). Moreover, each lag I add to the 
rerassion makes one month to be ommited from the regrssion (for example: 1 
lag - October is omitted, 2 lags - November is omitted etc.)

Is it right to use the ADF test? Or is there other test for stationarity 
that might feet better to my case?



Thank you very much,



Adam Dvir

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