finding best function

General
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1

Hi,
Im struggling with finding best fitting function defined as "y = ax " for data (x, y) = {(1,5), (2,4), (3,3), (4,2), (5,1)}.

I only managed to draw the plot, What function should I use?

df = data.frame(x = c(1,2,3,4,5), y = c(5,4,3,2,1))
plot(df$y ~ df$x)

The other question is why I cant use R2 = 1 −
RSS/TSS?

Thank you for your time.

2

df = data.frame(x = c(1,2,3,4,5), y = c(5,4,3,2,1))
model <- lm(y ~ 0 + x, data=df)
model

3

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