[Lign251] Problems with HW#2

[Roger Levy]

Hi Simone,

Simone Hartung wrote:
> Hi Roger,
> 
> I have trouble with the homework.
> 
> First, is there a function in R which is able to sum the Counts for the
> different syllable numbers? or do I have to do several steps to obtain
> that?

Try using table() or xtabs().  Also, tapply() is incredibly useful...

> I tried to plot it this way, but I get an error.
> 
> hist(brown1$Count, brown1$Nsyl)
> Error in hist.default(brown1$Count, brown1$Nsyl) :
>   some 'x' not counted; maybe 'breaks' do not span range of 'x'

I'm not sure exactly what you are trying to do here -- you want to use
plot(), not hist(), to produce a scatterplot; try that?

> 
> Then, I am not sure how to generate random variables. Is there a
> function in R to do that?

Take a look at the r*() functions.  For example, rnorm() to sample from
a normal distribution, rbinom() to sample from a binomial, and so forth.

Hope this helps!

Roger

-- 

Roger Levy                      Email: rlevy at ling.ucsd.edu
Assistant Professor             Phone: 858-534-7219
Department of Linguistics       Fax:   858-534-4789
UC San Diego                    Web:   http://ling.ucsd.edu/~rlevy