Implement a rounding function or argument for reporting DVs

[joethorley]

Therefore, the following rule for determining the number of significant figures for DGVs should be applied:
The significant figure to which a DGV is reported must correspond to the place of the first significant figure in the SE of the DGV. Where the SE is greater than the DGV, the DGV must be reported to one significant figure.
Rounding of a GV to the appropriate number of significant figures, should be done in accordance with the “rounding to evens” rule set out in Australian Standard SAA 2706-2003 (Standards Australia 2003). The “rounding to evens” rule adopts the most common convention for rounding – that is, rounding up when the value following the last value to be retained is >5 and rounding down when the value following the last value to be retained is <5. However, when the value following the last value to be retained is exactly 5 (i.e. there are no non-zero numbers to the right of this 5), then the value should be rounded to the closest even number.