[R] Converting date variables to integers for regression

[Carlos Ortega]

Hello,

Regarding the conversion to integer, you can use through the library "chron"
the equivalent Julian Date associated to each of your "y" values.
I do not know, if  the library "date" offers the same kind of possibility.

Regarding the use of dates as objects for regression, I think that is
possible in the "dse" library.

Regards,
Carlos.

-----Mensaje original-----
De: owner-r-help at stat.math.ethz.ch
[mailto:owner-r-help at stat.math.ethz.ch]En nombre de Mark Scarr
Enviado el: miercoles, 28 de noviembre de 2001 23:23
Para: 'R-help at lists.R-project.org'
Asunto: [R] Converting date variables to integers for regression


Hi All,

I am performing some piecewise linear
regression where my X-variable is the date mm/dd/yyyy
stored as a character vector. I would like to convert this
to an integer vector so I can set up dummy variables for the knots
and then perform the regression. Alternatively is it possible to
work with date objects? I was able to use certain binary operators
such as "-" with date objects, but am uncertain if it is possible
to use such objects for regression?


Any help would be most appreciated.


Thanks in advance

Mark.



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