Dear all,   When adding 'subgroup' to the gchart options, in order to allow bars have pre-defined patterns, the error bars are suddenly wrongly calculated. I do not know what the reason would be, and how to solve the problem for this simple graph... All help more than welcome   (A) below the code and barchart without subgroup, and correctly calculated error bars:       goptions reset=all; proc gchart data = cornell.transweightfinalchart; legend label=(h=1.5) VALUE=(h=1.5); axis1 label=(f='Times new roman/bo' h=2 a=90 "Larva (mg)" ) order=(0.36 to 0.52 by 0.02) value=(h=1.5) minor=(n=1); axis2 label=none value=(h=2 f='Times new roman'); axis3 label=none value=(h=2 f='Times new roman/bo'); vbar Treatment/ group=Experiment sumvar=L errorbar=top clm=68.26 width= 8 space= 1 gspace= 3 legend= legend type=mean raxis= axis1 maxis=axis2 gaxis=axis3; where treatment ne ''; run; quit;     (B) Below a subgroup, named 'Treatment' is added in order to adjust the pattern of the bar that represents either the the Cont. or the Infect. group (i.e. also pattern1 and pattern2 has been added). Error bars: not correct       goptions reset=all; proc gchart data = cornell.transweightfinalchart; pattern1 v=solid color=graycc; pattern2 v=solid color=cx437193; legend label=(h=1.5) VALUE=(h=1.5); axis1 label=(f='Times new roman/bo' h=2 a=90 "Larva (mg)" ) order=(0.36 to 0.52 by 0.02) value=(h=1.5) minor=(n=1); axis2 label=none value=(h=2 f='Times new roman'); axis3 label=none value=(h=2 f='Times new roman/bo'); vbar Treatment/ group=Experiment sumvar=L errorbar=top clm=68.26 subgroup=Treatment width= 8 space= 1 gspace= 3 legend= legend type=mean raxis= axis1 maxis=axis2 gaxis=axis3; where treatment ne ''; run; quit;     What did I do wrong?   Many thanks in advance.     ... View more