Aggregate a data frame in R using multiple FUN (mean, min, SD) : <p>I am trying to aggregate a data frame to find the mean, min, and SD of a specific column compared to another. I would like to aggregate Semester, and only apply mean, SD, and min to Grade. Then display all in one output as columns (aggregated-Semester, mean, min, SD). Is this possible? Below is the example data frame.</p>

<p>(Sorry for output of data frame, not sure how to create a table in the questions)</p>

<pre><code>#------------------------------------------
#|Student   |Semester   |Grade  |Name    |
#------------------------------------------
#|1         |9a         |90     |Jim     |
#|2         |9b         |91     |Beth    |
#|3         |9a         |76     |George  |
#|4         |9b         |87     |Phill   |
#------------------------------------------
</code></pre>
