Hi All,
From the library forecast I have fitted a regression model with ARMA residuals
on a transformed variable diff(log(Y),1).
What "code(s)" must I use to get the fitted and forecasted values on
level values ( or original scale of Y) without doing my own manual manipulation?
Please advice
Kind regards
Peter
082 456 4669
-----Original Message-----
From: Ismail SEZEN [mailto:sezenismail at gmail.com]
Sent: 13 July 2016 04:55 PM
To: Mangalani Peter Makananisa
Cc: r-help at r-project.org
Subject: Re: [R] Dates in R (Year Month)
You can not convert numeric vectors directly to yearmon object. You must convert
the X variable to character and add ?-? between year and month. Then as.yearmon
function will work properly.
Please, read help pages of ?as.character, ?strptime and ?as.yearmon.
Example:
> library(zoo)
> aaa <- as.yearmon(c("2015-02?, ?2014-06"))
> class(aaa)
[1] "yearmon"
> On 13 Jul 2016, at 16:25, Mangalani Peter Makananisa <pmakananisa at
sars.gov.za> wrote:
>
> Hi All,
>
> I am trying to convert the vector below to dates please assist I have tried
to use information on the links you sent, but it is not working.
>
> X = c(201501, 201502, 201503, 201505, 201506, 201507, 201508, 201509,
> 201510, 201511, 201512, 201601, 201602, 201603, 201604, 201605,
> 201606)
>
> library(chron, zoo)
> Z = as.yearmon(X) # it is not working
>
> please assist
>
> Kind regards
> Peter
>
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