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    <p>If you are talking about the space between facets, you can try this (also note that we do not have <code>short_brks</code> and <code>long_brks</code> so I removed those from your example code). <code>grid</code> is required for the <code>unit</code> function.</p> <pre><code>require(ggplot2) require(grid) avtimes3$id &lt;- factor(avtimes3$id) ## create and store plot p &lt;- ggplot(avtimes3, aes(x=trial, y=ttime, colour=id)) + facet_grid(. ~ brk, scales = "free") + geom_point(shape=21, fill="white") + ## remove space between panels opts(panel.margin = unit(0, "lines")) + ylab("Time taken (ms)") + xlab("Trial No.") ## as you had p + stat_smooth(method="loess") </code></pre> <p><img src="https://i.stack.imgur.com/7nWFI.png" alt="scatterplot with loess lines by ID and facet"></p> <pre><code>## only one line per facet p + stat_smooth(method="loess", aes(colour=NULL)) </code></pre> <p><img src="https://i.stack.imgur.com/y05jU.png" alt="scatterplot with loess lines by facet only"></p> <p>Edit: Rereading what you wrote and tried, I think you may want this:</p> <pre><code>## setup plot p &lt;- ggplot(avtimes3, aes(x=trial, y=ttime, colour=id)) + geom_point(shape=21, fill="white") + ylab("Time taken (ms)") + xlab("Trial No.") p + stat_smooth(aes(group = brk), method="loess") </code></pre> <p><img src="https://i.stack.imgur.com/rg7Ux.png" alt="three loess lines on scatterplot no facetting"></p> <p>The here that differs from what you had before is that the first argument to <code>stat_smooth</code> is mapping, the fifth is method. In <code>R</code> you have two options (maybe more). Either give the arguments in order <em>or</em> explicitly name the arguments. In your second example, you gave the arguments out of order and did not name explicitly like:</p> <pre><code>p + stat_smooth(method = "loess", mapping = aes(group = brk)) </code></pre> <p>To get separate lines for each id and grouping by <code>brk</code> is a bit trickier (conceptually). We need the interaction of brk and id. Colouring alone does not work, as it would with most geoms.</p> <pre><code>p + stat_smooth(method = "loess", mapping = aes(group = interaction(brk, id))) </code></pre> <p><img src="https://i.stack.imgur.com/gVQnv.png" alt="scatterplot with loess lines broken down by id and position"></p>
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    1. POHow to set the ranges of the values taken by ggplot2 stat_smooth() to fits lines?
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    1. POHow to set the ranges of the values taken by ggplot2 stat_smooth() to fits lines?
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    1. COThanks a lot! That is exactly what I wanted! Apologies for not including the `short_brks`and `long_brks`, those were define somewhere else in the code.
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    2. CONot a problem, they were fortunately easy to get around :)
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    3. COactually, what you did in last one is closer to what I wanted, but I was asking for one line for each id. You provided a solution that does that using `grid`, but was wondering if it was possible to do that with what you did in the last solution. Thanks!
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