<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><pre><i>Dear Grads users,</i></pre><pre><i>I want to calculate monthly averages (Dec Jan Feb) from daily data covering </i></pre><pre><i style="font-size: 12pt;">t</i><i style="font-size: 12pt;">he period of </i><i style="font-size: 12pt;">1951 to 2007. i want to use this data for time series. Is thereany clever way of using the ave()- </i><i style="font-size: 12pt;">function </i><i style="font-size: 12pt;">that would account for the </i></pre><pre><i style="font-size: 12pt;">varying lengths of the month (including </i><i style="font-size: 12pt;">the </i><i style="font-size: 12pt;">handling of leap years)?</i></pre><pre><i>Thanks for any advice,</i></pre><pre><i>Ayesha</i></pre></div></body></html>