874 Statistics and Data Analysis for Microarrays Using R and Bioconductor
releases and updates. Once such an update becomes available, the burden of
software o r data update rests a gain with the user w ho has to go over the in-
stallation process again. In many cases, the updated version work s worse than
the older version due to issues related to the local environment. In principle,
stand-alone tools can try to addr e ss this issue by providing automatic soft-
ware updates. However, this appr oach means that the updating software must
correctly identify, and appropriately dea l with, various local software environ-
ment is sues that tend to be slightly different over the potential hundreds or
thousands of different installations.
25.3.9 Data sources ...