localinformant dwellType[] = create(;object=set, data="single semi row")

local newDwellings[dt,t], maskPositive[dt,t], newDwellingsPos[dt,t]

newDwellings[dt,t] = create (; dim=dwellType, \
	dim=SEQ;time:2009:2011:1;year, entity=dwellUnit, \
	data= "10 10 12 5 -3 2 -6 7 9")

maskPositive[dt,t] = boolge (newDwellings[dt,t], 0)
newDwellingsPos[dt,t] = newDwellings[dt,t] * maskPositive[dt,t]

table (newDwellings[dt,t], maskPositive[dt,t], newDwellingsPos[dt,t]; window1=1, window2=1)