Hi Stephanie,
Take a look at the "xaxt" argument under ?par as well as ?axis.  Here is an
example modified from ?pacf :

acf(lh, xaxt = "n")
axis(1,  0:16, 0:16,  cex.axis = 0.8)

HTH,
Jorge


On Fri, Sep 11, 2009 at 12:02 PM, Stephanie Cooke <cooke.stephanie@gmail.com
> wrote:

> When I use the command for PACF, lags 5, 10, 15, and 20 are labeled. I
> would
> like to label lag 1. I would greatly appreciate if someone could tell me
> how
> to do this. Below is the command that I am using:
>
> pacf(data$R1,main="Series R1 Residuals")
>
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>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>

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