int index = headers.find(stat.getName());
final String str = csv.get(index).trim();
// is this an unknown value?
if( str.equals("?") || str.length()==0 ) {
HandleMissingValues handler = analyst.getScript().getNormalize().getMissingValues();
double[] d = handler.handleMissing(analyst ,stat);
// should we skip the entire row
if( d==null ) {
return null;
}