is there a difference in group data why is there a gap in the water levels how to find group differences with irregularly measured data why is water level measured at various locations can water level data be grouped how can you find a difference with irregularly measured data how to find nested versus irregular data why is a nested data set used to find gaps what does it mean when water level is irregular what is nested water level measurements? what is a nested dataset what is water level nested how to find group differences why are gaps in water level data so big? how to find group differences why is water level inconsistent when a water level is irregularly measured, what can be found in a group? why are water levels nested and missing why irregularities in water level in water are important why the gap between water level is irregular? how to test