TimeSeries series = new TimeSeries(name, start.getClass());
RegularTimePeriod period = start;
double value = base;
for (int i = 0; i < count; i++) {
series.add(period, value);
period = period.previous();
value = value * (1 + (Math.random() - 0.495) / 10.0);
}
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(series);