- geometrijska standardna deviacija (GSD) je razmerje med ocenjenima 84. in 50. percentilom in pokaže naklon krivulje kumulativne porazdelitve velikosti delcev, ob predpostavki, da je porazdelitev velikosti delcev logaritemsko normalna.
- the geometric standard deviation (GSD) is the ratio of the estimated 84 percentile to the 50 percentile and indicates the slope of the cumulative particle size distribution curve, assuming the size distribution to be log normal.