so</h3>

<p><code>Baltagi2002</code></p>


<h3>Examples</h3>

<pre><code class='language-R'>
data("OECDGas")

library("lattice")
xyplot(exp(cars) ~ year | country, data = OECDGas, type = "l")
xyplot(exp(gas) ~ year | country, data = OECDGas, type = "l")
</code></pre>

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