In some cases , Calc lacks a GUI to access certain advanced features that other spreadsheet software have , such as statistical abilities like error bar support on graphs , and polynomial regression analysis , however , many of these calculations can still be performed by manually entering the functions . In some cases , Calc lacks a GUI wizard to access certain advanced features associated with competing products , such as statistical capabilities like error bar support on graphs , and polynomial regression analysis . However , many of these calculations can be performed by manually entering the functions and relationships , plus a few macros .