Hey guys,
thanks a lot for your tips. The regression is finally running. As you
said, I had to integrate the column "year" in the function "time" in R.
So I used the following formula: *plm(log(revenue) ~ log(supply) +
factor(town)*time(year), data=R_Test_log_Neu)*
So I have now sucessfully added a linear trend to my regression model?
Another question that concernes me is how to add a quadratic trend
instead of a linear trend. Can I just square the column "year"?
Enjoy your weekend,
Toby
_My results see below:_
Balanced Panel: n=11, T=12, N=132
Residuals :
Min. 1st Qu. Median 3rd Qu. Max.
-0.09610 -0.02370 -0.00152 0.01980 0.14000
Coefficients :
Estimate Std. Error t-value Pr(>|t|)
log(supply) -0.0080702 0.0133675 -0.6037 0.547411
factor(town)2:time(year) -0.0063245 0.0053744 -1.1768 0.242100
factor(town)3:time(year) 0.0295522 0.0056776 5.2050 1.053e-06 ***
factor(town)4:time(year) 0.0062191 0.0054152 1.1485 0.253549
factor(town)5:time(year) 0.0159028 0.0054954 2.8939 0.004681 **
factor(town)6:time(year) 0.0237112 0.0055395 4.2804 4.316e-05 ***
factor(town)7:time(year) 0.0410007 0.0055734 7.3565 5.576e-11 ***
factor(town)8:time(year) 0.0239085 0.0053751 4.4480 2.271e-05 ***
factor(town)9:time(year) 0.0242342 0.0056855 4.2625 4.619e-05 ***
factor(town)10:time(year) 0.0105890 0.0053302 1.9866 0.049733 *
factor(town)11:time(year) 0.0095270 0.0056354 1.6906 0.094065 .
---
Signif. codes: 0 �***� 0.001 �**� 0.01 �*� 0.05 �.� 0.1 � � 1
Total Sum of Squares: 0.46388
Residual Sum of Squares: 0.2001
R-Squared: 0.56863
Adj. R-Squared: 0.4292
F-statistic: 11.8637 on 11 and 99 DF, p-value: 7.3065e-14
Am 11.05.2017 um 23:17 schrieb David L Carlson:
> What Rui said, but as important, you have four columns in your data called
> "town", "year", "revenue", and "supply". You do not have a column called
> "time".
>
> -------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77840-4352
>
> -----Original Message-----
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Rui Barradas
> Sent: Thursday, May 11, 2017 3:36 PM
> To: Tobias Christoph <s3toc...@uni-bayreuth.de>; Duncan Murdoch
> <murdoch.dun...@gmail.com>; r-help@r-project.org
> Subject: Re: [R] Error: invalid type (closure) for the variable 'time' -
> object specific trend
>
> Hello,
>
> A closure is, like you say, a function.
> At an R prompt try:
>
> > typeof(time)
> [1] "closure"
>
> So like Duncan suggested rename 'time', for instance capitalize it
> 'Time'. That should do it.
>
> Hope this helps,
>
> Rui Barradas
>
>
>
> Em 11-05-2017 21:20, Tobias Christoph escreveu:
>> Hey Duncan,
>>
>> thank you very much for your quick reply.
>>
>> _My data used:_
>>
>> 1st column(town):1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,...........,11
>>
>> 2nd column(year):1,2,3,4,5,6,7,8,9,10,11,12,1,2,3.......,12
>>
>> 3rd column (revenue):
>>
>> 4th colum (supply):
>>
>> I have now renamed my colums and did the regression again. Now there is
>> a problem with R-squared, as it is the sum of 1 now with no given std.
>> error and t-value. This is probably due to the fact, that I try to
>> estimate more parameters than data.
>>
>> To add a linear trend I found the following formular:*lm(y ~ x1 +
>> factor(ccode)*time, data=df)*
>>
>> I try to I decode it for and use it for my regression: *plm(log(revenue)
>> ~ log(supply) + factor(town)*time, data=R_Test_log_Neu)*
>>
>> When I do this regression I will get the original error: "invalid type
>> (closure) for the variable 'time' - object specific trend"
>>
>> With the notation"time" not my colum is meant, but probably the command
>> "time" in R.
>>
>> Can you follow my thoughts?
>>
>> Tobi
>>
>>
>>
>>
>>
>>
>> Am 11.05.2017 um 17:23 schrieb Duncan Murdoch:
>>> Duncan Murdoch
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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