[R] Using lag

[Nestor Arguea]

Robin,

You can use Lag (upper case "L") from package Hmisc.

Nestor Arguea
On Aug 18, 2008, at 8:40 AM, Williams, Robin wrote:

> Dear all,
>  I am having difficulties using the seemingly-simple function lag.
>  I have a dataframe with several weather variables (maxitemp,
> windspeed, rainfall etc), and the response variable (admissions). The
> dataset is fairly large (1530 observations). I simply want to model  
> the
> response against a lag of a couple of the explanatory variables, say
> maxitemp and rainfall. I would like to look at lagtimes of 4 days,  
> i.e.
> 4 observations. My dataframe is called allengland.
>  I thought I would be able to do something like:
> model1 <- lm(admissions~lag(maxitemp,4),data=allengland)
>  but when I compare this to a lag of 0 I have exactly the same output,
> so I am clearly doing something wrong.
>  Could someone please point me in the right direction? The example in
> the help for lag is not very detailed for what I need to do.
> Thanks in advance,
>
> Robin Williams
> Met Office summer intern - Health Forecasting
> robin.williams at metoffice.gov.uk
>
>
>
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>
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-------------------------------------------------------
Nestor M. Arguea, Chair
Associate Professor, Economics
Department of Marketing and Economics
University of West Florida
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e-mail: narguea at uwf.edu