<p>SO questions I often come back to:</p>
<p><a href="https://stackoverflow.com/questions/8508482/what-does-sd-stand-for-in-data-table-in-r/47406952#47406952">https://stackoverflow.com/questions/8508482/what-does-sd-stand-for-in-data-table-in-r/47406952#47406952</a></p>
<p><a href="https://stackoverflow.com/questions/22408306/using-i-to-return-row-numbers-with-data-table-package">https://stackoverflow.com/questions/22408306/using-i-to-return-row-numbers-with-data-table-package</a></p>
<p><a href="https://stackoverflow.com/questions/3505701/grouping-functions-tapply-by-aggregate-and-the-apply-family">https://stackoverflow.com/questions/3505701/grouping-functions-tapply-by-aggregate-and-the-apply-family</a></p>
<p><a href="https://stackoverflow.com/questions/22937618/reference-what-does-this-regex-mean">https://stackoverflow.com/questions/22937618/reference-what-does-this-regex-mean</a></p>
<p><a href="https://stackoverflow.com/questions/9471906/what-are-the-differences-between-community-detection-algorithms-in-igraph">https://stackoverflow.com/questions/9471906/what-are-the-differences-between-community-detection-algorithms-in-igraph</a></p>
<p><a href="https://stackoverflow.com/questions/32504313/how-to-add-horizontal-lines-showing-means-for-all-groups-in-ggplot2">https://stackoverflow.com/questions/32504313/how-to-add-horizontal-lines-showing-means-for-all-groups-in-ggplot2</a></p>
<p><a href="https://stackoverflow.com/questions/13961913/which-layout-should-i-use-to-get-non-overlapping-edges-in-igraph">https://stackoverflow.com/questions/13961913/which-layout-should-i-use-to-get-non-overlapping-edges-in-igraph</a></p>

desval