1. Virtual Observatory India VOStat Statistical Analysis for the Virtual Observatory By Deoyani and Mohasin

2. Virtual Observatory India VO India VO India is a collaboration between IUCAA and Persistent Systems The list of some of our products are 1) VOConvert (conVOT) 2) VOPlot 2D and VOPlot 3D 3) VOMegaPlot 4) Streaming C++ parser for VOTable 5) Java streaming VOTable writers http://vo.iucaa.ernet.in/~voi

3. Virtual Observatory India Overview VOStat is a web based service providing a suite of tools allowing astronomers to use both simple and sophisticated statistical routines on large datasets The tools mainly use statistical package called ‘ R ’ Datasets can be uploaded in either ASCII or VOTABLE format

4. Virtual Observatory India Previous Version It has total of 23 tests. 7 different categories The ASCII file has to be tab or space separated The preferred format is VOTABLE

5. Virtual Observatory India New VOStat Version

6. Virtual Observatory India Added Features 10 categories 26 different tests Basic tests grouped together Log and Exponential transformations can be applied to the dataset

7. Virtual Observatory India Data transparency The user can see source file along with data This feature is useful for selection of columns

8. Virtual Observatory India Help Pages The user can see the list of tests The help pages for selected test can be viewed

9. Virtual Observatory India VOStat Output Test results are formatted properly Test results can be saved on the local machine R code for the test can be seen

10. Virtual Observatory India Plots in VOStat Histogram Box Plot Quantile Quantile Plot Pair Plots

11. Virtual Observatory India VOPlot Connectivity Source dataset can be plotted in VOPlot

12. Virtual Observatory India Future Enhancements The web services and the stand alone version of VOStat Making VOStat accessible from VOPlot Allowing different transformations per column Obtaining statistics of multiple datasets

13. Virtual Observatory India Conclusion VOStat can be used by astronomers and statisticians It provides only some of the ‘R’ routines in the GUI We will try to improve VOStat with your suggestions.

14. Virtual Observatory India References VOStat http://vostat.org/ IUCAA http://iucaa.ernet.in Persistent Systems Pvt. Ltd. http://www.persistentsys.com VO India Home Page http://vo.iucaa.ernet.in/~voi