5  xt Structure

The Timeseries (xt) format is created to timeseries data and metadata.

It is a list of lists with the following fields:

• x List of datetime vectors that correspond to y values.
• x2 Optional list of datetime vectors that correspond to y2 values. If not provided, x is used.
• y List of numeric vectors that correspond to x values and will be plotted on the left y-axis.
• y2 Optional list of numeric vectors that correspond to x2 values and will be plotted on the right y-axis.
• xunits Character specifying the x-axis units.
• yunits Character specifying the y-axis units.
• y2units Character specifying the y2-axis units.
• Group List of factors the define groups for each datapoint.
• Shade Binary vector specifying windows of the x-axis to shade. (e.g. for light/dark, sleep/wake cycles, etc.)
• Reference Character giving the URL of a relevant publication if available.