[R] a question on autocorrelation acf

[Bazman76]

Hi there,

I am wondering how R calculates the acf too?

I have a data set of approx 1500 returns when I calculate the lag 1
autocorrelation in excel I get a value of -0.4 but in R its approximately
-0.18?

I have cross checked with PC give and PC give agrees with excel?

I'm sure its just some kind of scaling but it would be nice to resolve this
discrepency!

Baz

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