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Re: st: how to get monthly values from Bimonthly data
From
sabbas gidarokostas <[email protected]>
To
[email protected]
Subject
Re: st: how to get monthly values from Bimonthly data
Date
Tue, 31 Jul 2012 18:45:22 +0100
thanks Nick for your reply and the useful code. But I need to convert
these values to monthly data because the rest of my data are only
monthly values.
cheers
On 7/31/12, Nick Cox <[email protected]> wrote:
> I would leave these data almost as they are. What you can do is
>
> gen year = real(substr(dates, -4, 4))
> gen period = substr(dates, 1, 2)
> gen month = cond(per == "JF", 1, cond(per == "MA", 3, cond(per ==
> "MJ", 5, cond(per == "JA", 7, cond(per == "SO", 9, cond(per == "ND",
> 11, .))))))
>
> gen date = ym(year, month)
> tsset id date , delta(2)
>
> The key point is that you have bimonthly data and that's fine. No
> doubling up or interpolation is needed; in fact that can only produce
> a spurious increase in your sample size.
>
> Some people would undoubtedly prefer -recode- for the mapping "JF" -> 1,
> etc.
>
> Nick
>
> On Fri, Jul 27, 2012 at 3:48 AM, sabbas gidarokostas
> <[email protected]> wrote:
>> Dear all,
>>
>> I have the following panel data set
>> clear all
>> input str8 (id text dates values1
>> values2 )
>>
>> "1" "ot" " " "" " "
>> "1" "wt" " " "" " "
>> "1" "rt" "MA 2005" "32.4" "2.5"
>> "1" "gh" "MJ 2005" "82.3" "12.5"
>> "1" "bg" "JA 2005" "2.5" "24.5"
>> "1" "se" "SO 2005" "82.5" " "
>> "1" "cv" "ND 2005" "62.3" "26.3"
>> "1" "cv" "JF 2006" "12.2" "22.3"
>> "1" "cv" "MA 2006" "22.1" "2.4"
>> "2" "ot" " " " " " "
>> "2" "wt" " " " " " "
>> "2" "rt" "MA 2005"
>> "2" "gh" "MJ 2005" "32.3" "23.5"
>> "2" "bg" "JA 2005" "52.4" "22.3"
>> "2" "se" "SO 2005" "82.9" "22.5"
>> "2" "cv" "ND 2005" " " "2.5"
>> "2" "cv" "JF 2006" "332.4" " "
>> "2" "cv" "MA 2006" "312.4" "21.5"
>> end
>> The above data set is a sample.
>> Basically,I have 30000 individuals and instead of the last 2 columns
>> that contain the numbers I have 29 such columns.
>>
>> The data set refers to bimontly values.
>>
>> Is there a way to convert the above data to montly data?
>> Specifically, What I think is that first I have to split the dates as
>> follows
>>
>> M/2005
>> A/2005
>> M/2005
>> J/2005
>>
>> and so forth and then to convert them to
>>
>> 3/2005
>> 4/2005
>> 6/2005
>> and so forth.
>>
>> So regarding the first 3 columns I should get
>>
>> "1" "ot" " "
>> "1" "wt" " "
>> "1" "rt" "3/2005"
>> "1" "rt" "4 2005"
>> "1" "gh" "5/2005"
>> "1" "gh" "6/2005"
>>
>> and so forth.I am not exactly sure how to handle the last two columns,
>> though(numerical values)
>>
>> I think that one way would be to divide the bimonthly values by 2. Then I
>> get
>>
>> "1" "ot" " "
>> "1" "wt" " "
>> "1" "rt" "3/2005" "32.4/2" "2.5/2"
>> "1" "rt" "4 2005" "32.4/2" "2.5/2"
>> "1" "gh" "5/2005" "82.3/5" "12.5/5"
>> "1" "gh" "6/2005" "82.3/5" "12.5/5"
>>
>> I am not sure that this makes sense as I have repeated values for two
>> consequtive months.
>>
>> Another way would be interpolation?
>>
>> Any code provided is greatly appreciated.
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