[R] Odp: Plot and lm

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 04.06.2009 16:11:29:

> I want to make a log-log plot with a regression line, but I can't figure
> out what I'm doing wrong. What I'm trying is:
> 
> plot(mass,area, log="xy", pch=as.numeric(food))
> abline(lm(mass~area))


abline(lm(area~mass))

> 
> or
> 
> plot(mass,area, log="xy", pch=as.numeric(food))
> islands$logmass <- log(mass)
> islands$logarea <- log(area)
> attach(islands)
> abline(lm(logmass~logarea))

abline(lm(logarea~logmass))

> 
> 
> But that does not show a line. Where am I going wrong?

plot(x,y)
but
lm(y~x)

Regards
Petr

> 
> data: 
> island, area,species,food,mass
> Ibiza , 577 ,  Anser n. sp., herb,  2.0
> Ibiza , 577 ,    Haliaeetus albicilla, carn, 4.8
> Mauritius , 1874 ,  Raphus cucullatus, herb,  19 
> Mauritius , 1874 ,  Circus alphonsi, carn, 0.63
> Mallorca , 3667 , Myotragus balearicus, herb,  40 
> Mallorca , 3667 , Aquila chrysaetos, carn, 4.2
> Kreta , 8259 , Elephas creutzburgi, herb,  3200 
> .......
> 
> /Par
> 
> -- 
> Par Leijonhufvud                               par at hunter-gatherer.org
> I don't believe in reincarnation.  I used to,
> but that was in another life.
> 
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