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Re: st: xtserial error: "no observations"


From   Rodrigo Badilla <rodrigo.badilla@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtserial error: "no observations"
Date   Mon, 8 Apr 2013 19:47:25 -0400

Oh sorry for delay...


there are not missing values and yes there are gaps in date variable,
i generate a new var without gap, I followed the recomendation from Mr
Chương, and finally i could run the xtserial command, for get the
autocorrelation test.

thanks for you time and recomendations
Regards


Rodrigo Badilla
62202469


2013/4/8 Nick Cox <njcoxstata@gmail.com>:
> Previous questions still to be answered:
>
> 1. Incidence of missing values.
>
> 2. Does time variable contain gaps?
>
>
> Nick
> njcoxstata@gmail.com
>
>
> On 8 April 2013 20:13, Rodrigo Badilla <rodrigo.badilla@gmail.com> wrote:
>> Hi all,
>>
>> i used numeric data  type , below is a description of my data with codebook:
>>
>> fecha: numeric daily date (long) : this is my panel data (fixed effect)
>>  colocaciones: numeric (float)
>> tasa_min numeric (float)
>> tasa_max numeric (float)
>> imacec   numeric (float)
>> icv  numeric (float)
>> ipc  numeric (float)
>> cae   numeric (float)
>> ingreso,numeric (float).
>>
>> When i write this command the output was:
>>
>>  xtserial  colocaciones  tasa_min tasa_max imacec   icv  ipc  cae
>> ingreso, output
>> no observations
>> r(2000);
>>
>>  alternatively i used xtpcse and xtgls command to get some idea about
>> autocorrelation in my data panel
>>
>> Cross-sectional time-series FGLS regression
>>
>> Coefficients:  generalized least squares
>> Panels:        homoskedastic
>> Correlation:   no autocorrelation
>>
>> Estimated covariances      =         1          Number of obs      =       386
>> Estimated autocorrelations =         0          Number of groups   =         8
>> Estimated coefficients     =        15          Obs per group: min =        46
>>                                                                avg =     48.25
>>                                                                max =        49
>>                                                 Wald chi2(14)      =   1575.78
>> Log likelihood             = -6270.753          Prob > chi2        =    0.0000
>>
>> i know that my data number is small and probably the problem could be
>> in other side, I am working in that...
>>
>> regards
>> Rodrigo
>>
>> 2013/4/8 Nick Cox <njcoxstata@gmail.com>:
>>> You need to tell us more about exactly what you typed and the
>>> incidence of missing values.
>>>
>>> In addition, note that -xtserial- is user-written, so that you are
>>> expected to explain that and say where it comes from.
>>>
>>> I doubt that having 386 observations is itself a problem.
>>>
>>> Nick
>>> njcoxstata@gmail.com
>>>
>>> On 8 April 2013 15:34, Rodrigo Badilla <rodrigo.badilla@gmail.com> wrote:
>>>
>>>> Thanks for you reply and information, i did checked my variables and
>>>> are not strings... probably the missing values could be the answer...
>>>>
>>>> anyway i have been read that autocorrelation test with xtserial should
>>>> be used with panel data with a large number of data, could be this in
>>>> relation with my problem ( i have only 386 samples)
>>>
>>> 2013/4/8 Nick Cox <njcoxstata@gmail.com>:
>>>
>>>>> This typically means that
>>>>>
>>>>> either some variable you think is numeric is really string
>>>>>
>>>>> or some variable contains missing values, prohibiting some calculation.
>>>>>
>>>>> We can't say more without knowing more about your data.
>>>
>>> On 8 April 2013 13:52, Rodrigo Badilla <rodrigo.badilla@gmail.com> wrote:
>>>
>>>>>> I am triying to run a autocorrelation tests with xtserial command,
>>>>>> lamentably only get this error output: "no observations" previously i
>>>>>> set my data with xtset command, my data set have 386 samples.
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