To extract a high variance, even if the extraction is better, but it is necessary to decrease the variance in the preliminary to make high-performance extraction results than ever.
To extract data with high variability. Although the extraction can be effective but need to reduce the variability in the primary. The results of extraction efficiency than ever before.
In the extraction of data with variance is high. Although the extraction are effective, but need to reduce the variance in the introduction. To help the results of extraction efficiency than ever before.