Scatter plots

The scatter plot is a two dimensional plot used to visualize the behavior of one measurement as a function of a second measurement (instead of time).

The plot enables you to visualize correlations between measurements, and identify label grades (eg. based on two molar concentrations in the end product) or other operational regimes of interest.

The following is discussed in this article:

In the current version, search results are not explicitly marked in scatter plot mode.

How to create a scatter plot

TrendMiner uses the visible data present in the base layer of the focus chart for plotting. At least two tags need to visible in order to create a scatter plot.

  1. Visualise the desired tags (at least two tags need to be visible) in the tags menu .
  2. Navigate to the desired time period you want to use for plotting. 
  3. Click the trend icon  at the bottom-center of the focus chart. A new menu will pop up.
  4. Click the scatter icon . TrendMiner will now switch to scatter plot mode.

gotoxy.png

If you have two visible tags on, a scatter plot will appear.  A scatter plot matrix appears when activating this mode with multiple visual tags.
 
The scatter plot also shows a regression line (light-blue line) and correlation coefficient.
 
The scatter plot matrix shows an overview of the relationships between all visual tags; each tag is also represented by a histogram. Click on one of the scatter plots in the scatter plot matrix, to focus on a scatter plot of interest.
 
The screenshot below shows an example of a scatter plot generated using two tags.

The next screenshot show the initial scatter plot mode view using more than two visible tags (scatter plot matrix).

Scatter_Matrix.png

How to change tags in a scatter plot

TrendMiner displays the initial loaded tag on the x-axis by default. In order to change axis or switch to another tag you can: 
  1. Open the tags menu (if not open already). 
  2. Click the 'X' or 'Y' button next to the tag of interest to show it on the corresponding axis. The buttons next to the tag currently shown are highlighted while others are greyed out.  

Time range selection

The double slider, context bar, date pickers and other time navigation features (lock span etc.) remain fully functional in scatter plot mode. The scatter plot only represents behaviors in the selected time window, using a smart selection of points and their connecting lines. The same scale settings are used as in the trend view. 

How to mark an area in the scatter plot

Marked areas can only be used in area searches. In order to mark an area:

  1. Click once within the scatter plot to start marking.  
  2. Click again for each additional corner.  
  3. Double click to close the shape.

The screenshot below shows part of a linear scatter plot as a marked region. This can then be used as part of an area search.