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st: AW: Calculate the average bid-ask spread for each centile


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: Calculate the average bid-ask spread for each centile
Date   Fri, 27 Mar 2009 11:50:25 +0100

<> 

no need for a loop...

*************
bys centile: egen avgspread=mean(spread)
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von emanuele
canegrati
Gesendet: Freitag, 27. März 2009 11:46
An: [email protected]
Betreff: st: Calculate the average bid-ask spread for each centile

Dear users,
 
I have a time series of bid-ask spreads, grouped in centiles, with respect
to trading time. Now I want to calculate the average spread for each
centile. The structure of data is the following
 
day          spread   hhmmss  centile
20080602     xxxx     090302   1
20080602     xxxx     090510   1
...
20080602     xxxx     100408   2
20080602     xxxx     100908   2
...
20080602     xxxx     160007   100
20080602     xxxx     160107   100
...
20080603     xxxx     090302   1
20080603     xxxx     090510   1
...
20080603     xxxx     100408   2
20080603     xxxx     100908   2
...
20080603     xxxx     160007   100
20080603     xxxx     160107   100
...
 
What is the loop I have to write?
 
Thank You,
 
Emanuele Canegrati, Ph.D.
 
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