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POMerging aggregate data in R
 

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    <p>Following up my <a href="https://stackoverflow.com/questions/5200437/aggregating-hourly-data-into-daily-aggregates">previous question</a> about aggregating hourly data into daily data, I want to continue with (a) monthly aggregate and (b) merging the monthly aggregate into the original dataframe.</p> <p>My original dataframe looks like this:</p> <pre><code>Lines &lt;- "Date,Outdoor,Indoor 01/01/2000 01:00,30,25 01/01/2000 02:00,31,26 01/01/2000 03:00,33,24 02/01/2000 01:00,29,25 02/01/2000 02:00,27,26 02/01/2000 03:00,39,24 12/01/2000 02:00,27,26 12/01/2000 03:00,39,24 12/31/2000 23:00,28,25" </code></pre> <p>The daily aggregates have been answered in my <a href="https://stackoverflow.com/questions/5200437/aggregating-hourly-data-into-daily-aggregates">previous question</a>, and then I can find my way to produce the monthly aggregates from there, to something like this:</p> <pre><code>Lines &lt;- "Date,Month,OutdoorAVE 01/01/2000,Jan,31.33 02/01/2000,Feb,31.67 12/01/2000,Dec,31.33" </code></pre> <p>Where the OutdoorAVE is the monthly average of the daily minimum and maximum outdoor temperature. What I want to have in the end is something like this:</p> <pre><code>Lines &lt;- "Date,Outdoor,Indoor,Month,OutdoorAVE 01/01/2000 01:00,30,25,Jan,31.33 01/01/2000 02:00,31,26,Jan,31.33 01/01/2000 03:00,33,24,Jan,31.33 02/01/2000 01:00,29,25,Feb,31.67 02/01/2000 02:00,27,26,Feb,31.67 02/01/2000 03:00,39,24,Feb,31.67 12/01/2000 02:00,27,26,Dec,31.33 12/01/2000 03:00,39,24,Dec,31.33 12/31/2000 23:00,28,25,Dec,31.33" </code></pre> <p>I do not know enough R on how to do that. Any help is greatly appreciated.</p>
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