# The Java Embedded Aggregator Class Dev Aggregate

DevAggregate implements the standard deviation aggregation by extending class VarAggregate.

### For an overview see page Java Aggregator Class

### Class Definition

        public static class DevAggregate extends VarAggregate
        {
            public Object result()
            {
                return new Double(Math.sqrt((sum2 - sum*sum/count)/count));
            }
        }