[R] Variable Class "numeric" instead recognized by dplyr as a 'factor'

[Thierry Onkelinx]

I doubt that dplyr is the problem. have a look at the output of
str(CSUdata2) The problem is probably in there.

Sending a reproducible example of the problem makes it easier for us to
help you. Note that this list doesn't accept HTML mail. I suggest that you
read the posting guide carefully.

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-09-27 9:58 GMT+02:00 <james.vordtriede op att.net>:

> Hi--I’m new to R.  For a dissertation, my panel data is for 48 Sub-Saharan
> countries (cross-sectional index=’i’) over 55 years 1960-2014 (time-series
> index=’t’).  The variables read into R from a text file are levels data.
> The 2SLS regression due to reverse causality will be based on change in the
> levels data, so will need to difference the data grouped by cross-sectional
> index ‘i’.
>
>
> There are nearly 50 total variables, but the model essentially will
> regress the differenced Yit ~ X1it+X2it+X3it+X4it+X5it+X6it, with a dummy
> variable attached to each of the change-X(s).
>
>
> Due to missing data, R originally classified each X and Y variable as a
> ‘factor’, subsequently changed to ‘numeric’ via ‘as.numeric’ command.
>
>
> However, when I write the following command for dplr solely to difference
> Yit (=Yit-Yi[t-1]) mutated to new variable dYit, I receive error messages
> to the effect that Yit and each of the X variables are ‘factors’.
>
>
>
>
> >library (dplr)
>
> >dt = CSUdata2 %>% group_by (i) %>% (dYit=Yit-lag(Yit))
>
>
>
> ‘CSUdata2’ is the object in which the tab-delimited text file dataset is
> stored.
>
>
> Questions:
>
>
>  Any idea why dplyr reads the variables as ‘factors’?  A class(*) command
> per variable shows R to know each Y and X as ‘numeric’.
>
>
> Is the command to difference Yit done correctly?  I plan to use the same
> command for each variable requiring change until I understand the commands
> better.
>
>
>
> Thank you.
>
>
>
>
>
>
>
>
>
> Sent from Windows Mail
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help op 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.

	[[alternative HTML version deleted]]