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Re: st: RE: generating annualized standard deviation of returns from monthly data.


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: generating annualized standard deviation of returns from monthly data.
Date   Thu, 27 Feb 2014 09:21:40 +0000

There are various "Nick"s around here. In my case, I wouldn't offer
the explanation that the occurrence of missings will imply zero
standard deviations with -collapse-, because it isn't true. More
importantly, as you don't give the -collapse- code you used, we are
reduced to speculation that somehow your -collapse- produced a
collapse to constants, which have 0 SD.
Nick
njcoxstata@gmail.com


On 27 February 2014 05:53, Ikechukwu M. <bigdoctor2004@gmail.com> wrote:
> Thanks Kieran for your response. I tried that and it gives me all
> zeros. I think it has to do with how stata treats missing values in
> the collapse command. I had seen an earlier post by Nick regarding
> this.
>
> I used bys firm : egen sd=sd(return) and I get values but they are not
> partitioned by year. It gives me one SD for all the datapoints for the
> firm.
>
> thanks
>
> On Wed, Feb 26, 2014 at 11:23 PM, Kieran McCaul
> <kieran.mccaul@uwa.edu.au> wrote:
>> ...
>>
>> Like this?
>>
>> clear *
>>
>> input firm str7 date return
>> 1  "Jan2000"  0.875
>> 1  "Feb2000"  1.2
>> 1  "Mar2000"  0.9
>> 1  "Jan2001"  0.35
>> 1  "Feb2001"  0.98
>> 2  "Jan2000"  1.4
>> 2  "Feb2000"   .76
>> 2  "Mar2000"  1.34
>> end
>>
>> gen year = substr(date, 4,.)
>>
>> preserve
>>
>>    collapse (sd) sd_return=return, by(firm year)
>>    tempfile ttt
>>    save `ttt', replace
>>
>> restore
>>
>> merge m:1 firm year using `ttt'
>> list
>> bysort firm year: summ return
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ikechukwu M.
>> Sent: Thursday, 27 February 2014 9:33 AM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: generating annualized standard deviation of returns from monthly data.
>>
>> I am trying to compute standard deviation of returns for a panel data set and I am having a little difficulty.
>>
>> My data looks like this
>>
>> Firm    date                 return
>> 1         Jan2000              0.875
>> 1         Feb2000              1.2
>> 1        Mar2000               0.9
>> 1        Jan2001               0.35
>> 1        Feb2001               0.98
>> 2        Jan2000                1.4
>> 2        Feb2000                .76
>> 2        Mar2000                1.34
>>
>>
>> I would like to compute the annualized standard deviation of returns for each firm and return one number for each firm in each year.
>>
>> Any help is greatly appreciated.
>> Thank you very much.
>>
>> IK
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