t, New Jersey.
</p>


<h3>Examples</h3>

<pre><code class='language-R'>## Constructing panel functions on the fly
EE &lt;- equal.count(ethanol$E, number=9, overlap=1/4)
xyplot(NOx ~ C | EE, data = ethanol,
       prepanel = function(x, y) prepanel.loess(x, y, span = 1),
       xlab = "Compression ratio", ylab = "NOx (micrograms/J)",
       panel = function(x, y) {
           panel.grid(h=-1, v= 2)
           panel.xyplot(x, y, grid = FALSE)
           panel.loess(x, y, span = 1)
       },
       aspect = "x