1 / 8

Big Data

Big Data. Steven Gollmer Cedarville University. Working with Large Data. Accessing data Collection and calibration assumptions Selecting appropriate parameters Formatting Calculation Testing hypothesis. Hipparcos Space Astrometry. Main Page

gad
Télécharger la présentation

Big Data

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Big Data Steven Gollmer Cedarville University

  2. Working with Large Data • Accessing data • Collection and calibration assumptions • Selecting appropriate parameters • Formatting • Calculation • Testing hypothesis

  3. Hipparcos Space Astrometry • Main Page • http://www.rssd.esa.int/index.php?project=HIPPARCOS • Data Catalogues • http://www.rssd.esa.int/index.php?project=HIPPARCOS&page=Overview • http://cdsweb.u-strasbg.fr/ • Software • Desktop - http://www.rssd.esa.int/index.php?project=HIPPARCOS&page=Celestia2000 • Search tool - http://www.rssd.esa.int/index.php?project=HIPPARCOS&page=multisearch2 • Data Format • Flexible Image Transport System (FITS) - http://fits.gsfc.nasa.gov/

  4. Sloan Digital Sky Survey • Main Page • http://www.sdss.org/ • Data • 9th Data Release - http://www.sdss3.org/dr9/ • Archive Server - http://dr9.sdss3.org/ • Software • IDL - http://www.sdss3.org/dr9/software/

  5. Weather Data • NOAA National Climatic Data Center • http://www.ncdc.noaa.gov/ • Popular Data - http://www.ncdc.noaa.gov/most-popular-data • Environmental Modeling Center • http://www.emc.ncep.noaa.gov/

  6. TERRA/AQUA • http://terra.nasa.gov • http://aqua.nasa.gov • Data • LARC DAAC - http://eosweb.larc.nasa.gov/ • LAADS Web - http://ladsweb.nascom.nasa.gov/index.html • Format • NetCDF - http://www.unidata.ucar.edu/software/netcdf/ • HDF - http://www.hdfgroup.org/

  7. Other Topics of Interest • Topics of Interest • Extra-Solar Planets • Asteroid Mapping and Near Earth Detection • Earthquakes • Agencies and Products • NASA - http://www.nasa.gov/home/index.html • ESA - http://www.esa.int/ESA • USGS - http://www.usgs.gov/ • GOES - http://www.goes.noaa.gov/ • Paleoclimatology - http://www.ncdc.noaa.gov/paleo/pubs/pcn/pcn-proxy.html

  8. Hypothesis Testing • P-value • Probability of a value being found assuming the null hypothesis. • Usually reject the null hypothesis if p < 0.05 or 0.01 (5% or 1%) • May have more stringent criteria for rejection. • T-test • Assume a normal distribution • One-sample test • Two-sample test • Check significance using T distribution table • If number of samples is large, then z-test will work on one-sample test • erf(x)= • One Tail: z=1/2(1+erf(x/) Two Tail: z=erf(x/)

More Related