2D Line Plots - Variables - Advanced Tab

Graphical Analytic Techniques

The Advanced tab of the 2D Line Plots Startup Panel contains a variety of options for creating 2D line plots (variables).

Variables

Click the Variables button to display the standard variable selection dialog box, in which you select the y-axis variable(s) to be plotted. If you select more than one variable for Regular or XY Trace line plots, a sequence of graphs (one for each selected variable) are produced. Note that the x-axis is labeled with case names (the first column of data) in the order they are listed in the spreadsheet.

Graph type

Select the type of line plot to be plotted from the Graph type list. Click the desired plot link listed below for a brief description of that type of graph.

Regular	XY Trace
Multiple	Aggregated
Double-Y

Ignore missing data. When missing data are present, a discontinuous line is drawn for that plot. You can elect to ignore missing data by selecting this check box, and a continuous line will then be drawn for that plot.

Ignore out of frame points. This check box is selected by default. This option controls whether line segments are drawn to points that fall outside the visible range when the scaling has been adjusted via the Axis - Scaling tab of the Graph Options dialog box so that some points are not in the current graph.

Fit

You can fit an equation to the points in the line plots by selecting one of the predefined functions in this box.

Linear	Negative Exponential Weighted
Polynomial	Spline
Logarithmic	Lowess
Exponential	Moving Average
Distance Weighted Least Squares	Exponential Smoothing

Aggregated data. The options in this box (available when Aggregated line plots have been selected as the Graph type) are useful when there are very many differentiated observations in the sequence of points, in order to uncover or expose the overall pattern of the data sequence. In this case, the means of consecutive sets of N observations are plotted instead of the raw data.

Span

Specify here the number of consecutive observations from which the mean will be calculated.

Value range bars

When you select this check box, whiskers representing the range of the N values from which the means are calculated are placed in the plot at the respective points.

Note: A selection of data smoothing and filtering procedures integrated with line plots are available in the Time Series module.

Display points

You can display the line plot with (On) or without (Off) point markers. If you select Auto, STATISTICA automatically determines the display of point markers depending on the number of observations and the closeness of the points (usually, if N > 100, the points are not displayed).