[R] HEEELP!!!!

[cls59]

Ana María Prieto wrote:
> 
> Hello.
> My name is Ana. I´m doing an eology master, and I´m just learning how R
> works.
> I have a Mac OS X 10.5.6, and I´m tryng to run just a simple ANOVA
> nanalyses.
> I dowloaded R version 2.10.0, and it seems I have problems with the
> script.
> I don´t know what to do, I´ve already change the languages, be sure of
> being
> working in the correct directory and doesn´t work
> 
> the script is:
> 
> #1. example
> 
> data01<-read.table("ch01.txt",header=T)
> 
> names(data01)
> 
> attach(data01)
> 
> FERTIL<-factor(FERTIL)
> 
> model01<-(YIELD~FERTIL)
> 
> summary(model01)
> 
> anova(model01)
> 
> 
> all my classmates, even those with a mac operator, wrote the same, and it
> worked.
> 
> 


Well, the line:

  model01 <- (YIELD~FERTIL)

Creates an object of class "formula", which is not a model.  A formula only
expresses a relationship between variables, a model consists of a formula
that has been fit to a data set.  The anova() function has no meaning for
formula objects since no data has been fit.  If you wanted a linear model,
use the lm() function to create it:

  model01 <- lm( YIELD ~ FERTIL )

Non-linear functions may be fit using nls() and R has plenty of other
fitting schemes if you should require them.



Ana María Prieto wrote:
> 
> 
> When copying the script in the R console, it seems that there is a problem
> with the
> 
> ~ symbol. this symbol is not in the keyboard, so I select it from spetial
> characters,
> 
> and then i selected with shift an <>key, and still, it doesn´t works
> 
> 


On my keyboard the '~' character is accessed by pressing SHIFT-backtick,
where backtick is the key above the "Tab" key and to the left of the "1"
key.  You may have a different keyboard.


Ana María Prieto wrote:
> 
> 
> I attached th file with the data. i hope you can help me!!!!!
> 
> Ana.
> 
> 


-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
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