February 24, 2015

The story started from …

  • cranvas: R package for interactive graphics
  • Little graphics research in exploring temporal data
  • Need of more interactions than zooming, panning, identifying, brushing, …

cranvastime

  • Interactive time plots for
    • univariate time series
    • multivariate time series
    • longitudinal data
  • To explore
    • trends
    • periodicity
    • seasonality
    • dependence
    • individual differences
    • anomalies

Wrapping: explore the periodicity

Facetting: compare different series

  • NASA data
    • variables: elevation, temperature (surface and air), ozone, air pressure, and cloud cover (low, mid, and high)
    • monthly averages from Jan 1995 to Dec 2000
    • geographically and atmospherically measured on a very coarse 24 by 24 grid covering Central America
    • obtained from the NASA Langley Research Center Atmospheric Sciences Data Center

Linking: view from different sides

  • US monthly temperature for over 100 years
  • 1218 weather stations

Future work

  • Frequency domain
  • Polar coordinates
  • Lag plots