[R] curve() doesn't seem to use the whole range of x? And Error: longer object length is not a multiple of shorter object length
Matti Viljamaa
mviljamaa at kapsi.fi
Sun Sep 25 15:10:16 CEST 2016
Writing:
bs["(Intercept)"]+bs["mies"]*0+bs["kouluB"]+bs["lka"]*lka+bs["kouluB:clka"]*clka
i.e. without that being inside curve produces a vector of length 375.
So now it seems that curve() is really skipping some lka-/x-values.
> On 25 Sep 2016, at 16:01, Matti Viljamaa <mviljamaa at kapsi.fi> wrote:
>
> I’m trying to plot regression lines using curve()
>
> The way I do it is:
>
> bs <- coef(fit2)
>
> and then for example:
>
> curve(bs["(Intercept)"]+bs["mies"]*0+bs["kouluB"]+bs["lka"]*x+bs["kouluB:clka"]*clka, from=min(lka), to=max(lka), add=TRUE, col='red')
>
> This above code runs into error:
>
> Error in curve(bs["(Intercept)"] + bs["mies"] * 0 + bs["kouluB"] + bs["lka"] * :
> 'expr' did not evaluate to an object of length 'n'
> In addition: Warning message:
> In bs["(Intercept)"] + bs["mies"] * 0 + bs["kouluB"] + bs["lka"] * :
> longer object length is not a multiple of shorter object length
>
> Which I’ve investigated might be related to the lengths of the different objects being multiplied or summed.
> Taking length(g$x) or length(g$y) of
>
> g <- curve(bs["(Intercept)"]+bs["mies"]*0+bs["kouluB"]+bs["lka"]*x, from=min(lka), to=max(lka), add=TRUE, col='red')
>
> returns 101.
>
> However length(lka) is 375. But perhaps these being different is not the problem?
>
> I however do see that the whole range of lka is not plotted, for some reason. So how can I be sure
> that it passes through all x-values in lka? And i.e. that the lengths of objects inside curve() are correct?
>
> What can I do?
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