[Lign251] HW3 Q3

[rlevy at ling.ucsd.edu]

Hi Kate,

Could you post a code snippet that gives this error?

Thanks!

Roger

Kathryn Davidson wrote:
> In problem 3, I have a perfectly good plot (using plot()) of the 
function that seems to estimate the histogram. However, I am really 
having problems using lines() to overlay it on top of the histogram. It 
just keeps saying:
>
> Error in as.vector(x, "double") : cannot coerce to vector
>
> So I guess my function isn't in vector format... but I can't figure out 
how to make it one. In Baayen pg. 27 I think he's answering this 
question but I can't follow what he's saying.
> Any tips?
> Kate
>
> On 10/21/07, *rlevy at ling.ucsd.edu <mailto:rlevy at ling.ucsd.edu>* 
<rlevy at ling.ucsd.edu <mailto:rlevy at ling.ucsd.edu>> wrote:
>
>     Rebecca Colavin wrote:
>      > Okay, I give up.
>      >
>      > The graph in the question generates a distribution where the
>     probability
>
>      > mass (=1) is contained under the curve. In short, the y axis is
>     (0,9) or
>
>      > so .
>      >
>      > But when I try to do lines over it with a normal distribution,
the y
>     values are probabilities. The y axis for this is (0,1).
>
>     Hi Rebecca,
>
>     Because the normal distribution is a continuous probability density,
the
>     y values (for the density) are not bounded above by 1.  Remember, it
is
>     the *area under the curve* that must total 1.  If the scale of the x
 axis
>     is small, p(x) can easily surpass 1.
>
>     As an example, try:
>
>      > x <- seq(-5,5,by=0.01)
>      > plot(x,dnorm(x,0,0.1),type="l")
>
>     This normal density peaks around p(x) = 4.
>
>     Using hist() with prob=T also is an estimation of density, which is
why
>     the hist() y axis also surpasses 1.
>
>
>     Roger
>
>
>     --
>
>     Roger Levy                      Email: rlevy at ucsd.edu
>     <mailto:rlevy at ucsd.edu>
>     Assistant Professor             Phone: 858-534-7219
>     Department of Linguistics       Fax:   858-534-4789
>     UC San Diego                    Web:   http://ling.ucsd.edu/~rlevy
>
>
>
>
>
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-- 

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