Hello,

   I've hit a bit of a snag here: I had to update to the latest version of R to get ballgown working, but one of the functions I see included in filtering out low expression genes, rowVars, is not available for this version of R.

Using this tutorial: https://rpubs.com/kapeelc12/Ballgown

The rowVars function is employed in filtering:

    bg_filt = subset(bg,"rowVars(texpr(bg)) >1",genomesubset=TRUE)

I have R studio, would it be possible to download an older version of R and switch to it temporarily to use rowVars, then switch back to continue the ballgown output analysis? 

If so does anyone know what the last version of R rowVars worked on? 

Or should I try to find an older version of ballgown, and downgrade my R version? I know there are many functions on bioconductor that do not necessarily work on the latest version of R, so is there a benifit to running older versions of R generally when working with these packages?
Is it the `rowVars` function from [metaMA][1] ?

    install.packages('metaMA')
    library(metaMA)
    ?rowVars

  [1]: https://www.rdocumentation.org/packages/metaMA/versions/3.1.2