Hi
as far as I can see from the replies you have got, nothing very helpful
turns up. I might have some useful information, it does not relate to STATA,
though, but I have used this specialised seasonality program several times.
The original reference is Jones RH, Ford PM, Hamman RF: Seasonality
comparisons among groups using incidence data. Biometrics 1988; 44:
1131-1144.
The latest publication I have been involved in concerning this method is
Hauschild K-M, Mouridsen SE, Nielsen S: Season of birth in Danish children
with language disorder born in the 1958-1976 period. Neuropsychobiology
2005; 51: 93-99.
The original author RH Jones is very helpful with giving access to the
special software his group has developed. It works well if the average
monthly incidence is three or above.
Regards
S�ren Nielsen
----- Original Message -----
From: "kelly johnson" <[email protected]>
To: <[email protected]>
Sent: Friday, April 01, 2005 5:25 PM
Subject: st: seasonality
> Hi,
>
> I am returning to stata after a hatus of a couple of years. I had two
quick
> questions:
>
> Suppose I am using a stream of time seies data for a single varible (Data,
> Variable1):
>
> (1) suppose i wanted to generate a new varible that equale variable1 - the
> mean of varible1. how do i do this (without having to create a whole
column
> with only the mean of variable1 in it)?
>
> (2) is there an easy wasy to test for seasonality? in sas we have the proc
> x12 command? what's a quickand eqasy way to test for seasonality in data?
>
> thanks
>
> kelly
>
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