R help - Jun 2002 - Error: NA/NaN/Inf in foreign function call (arg 1)

Hi,

I have a huge data table with several variables containing missing values. I
want to make a simple scatter plot (Mass, HSI) and draw a smooth regression
on it.

Here are the summaries of these two variables:
> summary(Mass)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
   46.0   205.9   272.5   282.6   348.3   610.1
> summary(HSI)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's
  0.300   1.045   1.350   1.491   1.835   4.270  13.000

So there are 13 missing values in HSI.

I did
plot(Mass,HSI)

and it worked fine. However, when I wanted to draw the smooth regression,

scatter.smooth(Mass,HSI)

I got this error:

Error: NA/NaN/Inf in foreign function call (arg 1)

I did not forgot to load the package modreg...

Must I declare the "NAs" before doing this analysis? If so, how?

Thanks,

S?bastien Plante

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Dear S?bastien,

At 11:20 AM 6/14/2002 -0400, S?bastien Plante wrote:
>I did
>plot(Mass,HSI)
>
>and it worked fine. However, when I wanted to draw the smooth regression,
>
>scatter.smooth(Mass,HSI)
>
>I got this error:
>
>Error: NA/NaN/Inf in foreign function call (arg 1)
>
>I did not forgot to load the package modreg...
>
>Must I declare the "NAs" before doing this analysis? If so, how?
scatter.smooth doesn't handle missing values. A simple way to proceed is to 
remove the missing data:

         good <- complete.cases(Mass, HSI)
         scatter.smooth(Mass[good], HSI[good])

I hope that this helps,
  John
-----------------------------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox
-----------------------------------------------------

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