final Array newValues = new Array(size(i));
final Array newSpreadAdjustedRate = new Array(size(i));
final Array newConversionProbability = new Array(size(i));
stepback(i, convertible.values(), convertible
.conversionProbability(), convertible.spreadAdjustedRate(),
newValues, newConversionProbability, newSpreadAdjustedRate);
convertible.setTime(t.get(i));
convertible.setValues(newValues);