[R] How to find out the trend during a time period?

[Uwe Ligges]

On 28.10.2010 06:50, Lao Meng wrote:
> Hi all:
> I have a dataset which contains two variables: Y and time
> y<-c(228,189,232,198,252,315)
> time<-2003:2008
>
> How can I find out the trend(increase/decrease) of y along the time period?
>
> If I use:
> lm(y~time)
>
> The "lm" command treats time as natural number,but not date.

What is "date"? WHere is the reproducible example?

Uwe Ligges



> So maybe "lm" isn't appropriate.
>
> Then,which function could be used?
>
> Thanks a lot for your help.
>
> My best
>
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