Change HB and DB to continuous (not factors)
Merge branch 'master' of https://github.com/lbeaudrot/Species-Richness
Merge branch 'master' of https://github.com/lbeaudrot/Species-Richness
Merge branch 'master' of https://github.com/lbeaudrot/Species-Richness
Merge branch 'master' of https://github.com/lbeaudrot/Species-Richness
Replace missing values with NA