If you're creating a table from scratch and adding indexes to that table, then you won't have to worry about stats from a compression change point of view because they'll be fresh when the empty table is built. Once you've added data to that table, then the usual rules covering stats updates should be observed. As far as I know, page/row/no compression makes no difference to stats.
If you're changing an existing table from uncompressed to compressed, then you have to rebuild the indexes - including the clustered index. This will of course update stats.
If you're working with a partitioned table which already contains data then as you've shown, the data compression commands are slightly different but the same rules apply. You can also change the data compression type at the partition level.
[font="Arial"]“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw[/font]
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