[R] Data Package Query

[Jeff Newmiller]

You need to learn to execute one statement at a time in order to debug this yourself. Copy and paste is your friend. Hint: I already told you that the data function is inappropriate if the data does not come from a package.

You should be learning to use the str(), head(), and ls() functions to explore your R in-memory environment, and use the built-in help system with the question mark ("?str") or the help.search() and RSiteSearch() functions.
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Sent from my phone. Please excuse my brevity.

Yasmine Refai <y_refai at hotmail.com> wrote:

>hello,
> 
>please advice what is wrong at the below syntax:
>"Trial<-read.table("Trial.txt",header=TRUE)
>Trial
>save.image(file="Trial.RData")
>data(Trial)
>fit<-logistf(data=Trial, y~x1+x2)
>"
> 
>and here is the error I get:
>"Warning message:
>In data(Trial) : data set ‘Trial’ not found
>"
> 
>regards,
>yasmine
>
> 
>> Date: Fri, 28 Jun 2013 10:29:21 +1200
>> From: rolf.turner at xtra.co.nz
>> To: jdnewmil at dcn.davis.ca.us
>> CC: y_refai at hotmail.com; r-help at r-project.org
>> Subject: Re: [R] Data Package Query
>> 
>> On 28/06/13 04:47, Jeff Newmiller wrote:
>> 
>>      <SNIP>
>> > A common error by beginners (which may or may not be your problem
>in this case) is to create a variable called "data". Unfortunately this
>hides the function named "data" and from that time forward that R
>session doesn't work when you type example code that uses the data
>function.
>> 
>>      <SNIP>
>> 
>> This is simply not true.  I believe it *used* to be true, sometime 
>> waaaaayyyy back,
>> but hasn't been true for years.  The R language is much cleverer now.
> 
>> If there
>> is a function "melvin()" somewhere on the search path and also a data
>object
>> "melvin" (earlier on the search path) then doing
>> 
>>      melvin(<whatever>)
>> 
>> will correctly call the function melvin() with no complaints.  The R 
>> language
>> "can tell" by the parentheses that you mean the *function* melvin and
>
>> not the
>> data object "melvin".
>> 
>> E.g.
>> 
>>      data <- 42
>>      require(akima)
>>      akima
>>      Error: object 'akima' not found
>>      data(akima)  # No error message, nor nothin'!
>>      akima
>>      # The data set "akima" is displayed.
>> 
>> All that being said it is ***BAD PRACTICE***, just in terms of 
>> comprehensibility
>> and avoiding confusion, to give a data set set the same name as a
>function
>> (either built in, or one of your own).
>> 
>>      fortune("dog")
>> 
>> is relevant.
>> 
>>      cheers,
>> 
>>          Rolf Turner
>> 
>