Add on software for the Neuroguide. Group comparative statistics require the use of NeuroBatch to produce a NeuroGuide Group Analysis File or *.NGG file. Descriptive Group statistics include Means and Standard Deviations and independent t-tests between Groups (does not assume equal variance or sample sizes). Group statistics are used to compare different groups of subjects such as 100 ADD children to 100 normal children, etc. Use NeuroBatch to create the *.NGG files before using NeuroStat.