[R] Learning ANOVA

[David Winsemius]

On Aug 15, 2010, at 10:58 AM, Stephen Liu wrote:

> ----- Original Message ----
>
> From: David Winsemius <dwinsemius at comcast.net>
> To: JesperHybel <jesperhybel at hotmail.com>
> Cc: r-help at r-project.org
> Sent: Sat, August 14, 2010 5:44:00 PM
> Subject: Re: [R] Learning ANOVA
>
>
> Hi David,
>
> - snip -
>
>>> JH > Also how to save InsectSprays.aov?  I think I can only save  
>>> it as
>>> InsectSprays.csv.  I can't find "write.aov" command.
>
>> If you want to save an R object such as that returned by a function  
>> like aov,
>> there are several ways. The save() function will create a compacted  
>> form that
>> can then be read back into an R session with load(). >The dump()  
>> and dput()
>> functions will turn an object into an ASCII representation that can  
>> be saved as
>> a text file. If you only want to have the text that is produced  
>> when you "print"
>> it (and this is what you >implicitly get when to just call the  
>> function at the
>> console), then use sink() or capture.output().
>
>
> Whether run;
>> save(InsectSprays.aov, file="InsectSprays.rda")
> ?
>
> How to select the path and directory for saving the file?

Try this:

save(InsectSprays.aov, file=file.choose()  # and save it in a location  
that you will be able to remember.

> To load the file;
>> load(InsectSprays.rda) That would not work because you did not  
>> quote the argument. The R interpreter went looking for a a  
>> character valued object named InsectSprays.rda and didn't find one  
>> in its workspace.

> ?

Then try this:
load(file.choose())   # and navigate to whatever folder in which you  
save the file.

>
>
> I looked at ?dump and ?dput and couldn't resolve how to run them  
> creating ASCII
> and text file.  Please help.  TIA
>
>
>>> "InsectSprays.aov" is an object - in this case probably a list.
>
>> Not "probably"; it is a list. Look at it with str if you have  
>> questions.

This is just to get you started. You also need to learn how to  
properly name your files in your operating system. Since it is a Mac,  
you can drag a file to the console from a Finder window and a correct  
text specification of the file will appear. Put quotes around it and  
you cna use it as an argument to laod or as an arguemtnt to file in  
save.

-- 

David Winsemius, MD
West Hartford, CT