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- Back Button – Don't press the back button! Sigma functions using tabbed windows and pressing the back button will lose your current progress.
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Introduction
The Regression activity allows you to view correlations on a site, view the CUSUM and set targets based on the CUSUM and Regression. This activity is not available from the main Activity Menu; it is only available via right click of a Site or through the Site Overview activity.
Navigation
In the Site Overview activity selecting Actions in the top right of the screen will allow you to navigate to other activities within Sigma including Regression.
Anchor
Alternatively, right-click on a Site and select 
from the menu.
Navigate from Regression to the Control Chart via CUSUM by clicking 
in the bottom right corner or using the bar at the top of the activity.
- It is not possible to go directly from Regression to the Control Chart as it is a designed as a stepped approach.
Regression Correlation Window
Automatic Regressions
Sigma will automatically check the system to find any correlations with an R2 value of 0.9 or greater.
Correlations will be between two data points and those found automatically will display as follows:
Hints & Tips
- Side Panels – When you see the graphic below on a panel it can be collapsed using a mouse click. You can re-open the panel by clicking on the same graphic.
- Section Stacks – Where you see the arrow icon on sections you can click to collapse / expand the section.
Manual Regressions
Correlations can also be setup manually by selecting 
and choosing the required correlation items within the setup screen.
Once a manual regression is created it will look similar to this.
To view the regression correlation, right-click the image and select 
or double-click the regression image.
Regression
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Graph
- The graph plots the Dependent Data against the Independent Data and draws a line of best fit.
Overview
- The Overview chart shows the dependent data and independent data for the regression period and part of the historic period too.
- Dragging your mouse over this chart will update the regression period displayed.
- The Overview Graph can be minimised by clicking the Overview header bar.
Manage Regression Targets 
- If a regression is found, it is automatically saved as Original Correlation, this correlation cannot be amended.
- A New performance line is also created which can be amended and saved as a new regression target.
Details 
This section shows gradient and intercept of the graph.
The gradient and intercept can be adjusted by selecting 
and entering a value in the popup box.
To remove the gradient and intercept select 
.
When a custom gradient is set the R2 values are not available.
The details section displays both the Correlation Coefficient and Coefficient of Determination.
Monitoring Point
A Monitoring Point stores information that has been created from various sources of data. For example, a calculation of the total gas consumed by a number of sites derived from gas consumption data at each individual site.
The data in the Monitoring Point object would be generated by an equation (in this case a simple sum) combining all of the sources of data (in this example gas consumption at each site).
Regression Period 
Use the start date to choose the start period for the graph, either selecting the drop down boxes or the calendar icon 
.
Set the end date for the graph in the same way.
Table
Selecting the 
tab displays the data points that are plotted on the graph.
Uncheck any line item that you want to exclude from the graph 
.
Excluding points from the graph will recalculate the line of best fit.
The date displayed within the table is the end date for that period.
The table and charts can be saved by selecting the 
icon.
CUSUM
Graph
The graph shows the cumulative data based on the CUSUM period.
Clicking and dragging your mouse over the graph will zoom into the data.
Overview
The Overview chart shows the dependent data and independent data for the CUSUM period and part of the historic period too.
Dragging your mouse over this chart will update the CUSUM period displayed.
If the CUSUM period is different to the Regression period then you will see two colours highlighted on the overview. Blue is the regression period and purple the CUSUM period.
The Overview Graph can be minimised by clicking the Overview header bar.
Details
CUSUM and CUSUM CO2 will always be 0.00 when moving straight from Regression without changing the CUSUM period.
When the CUSUM period is changed then anything above the 0 value based on the regression period will be calculated and listed in both kWh's and CO2. Hints & Tips
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Data Analysis
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Check the Show V-Mask box to add a V-Mask target onto the CUSUM. To confirm target creation select 
in the resulting popup window.
By default a truncated V-Mask will be applied, adding a green layer to the graph.
There are 3 types of V-Mask targets available as follows. To change the type, continue reading.
Full mask
Snub-nosed mask
Truncated mask
Check Show Fixed Targets to add a CUSUM fixed target. To confirm target creation select in the resulting popup window.
Targets
This section displays any targets that have been created on the CUSUM.
To change any of the settings, right-click on the target and select 
.
To remove a target, right-click on the target and select 
.
If you edit a V-Mask Target you will be presented with the following window.
If you edit a CUSUM target you will be presented with the following window.
Update the settings as required and click OK.
The Targets will only create an event if the first point of data is outside the tolerance range by >5% or if there are two consecutive points of day outside the tolerance range but with the 5% range
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.CUSUM Period
Use the start date to choose the start period for the graph, either selecting the drop down boxes or the calendar icon .
Set the end date for the graph in the same way.
Table
Selecting the tab displays the data points that are plotted on the graph.
The date displayed within the table is the end date for that period.
The table and charts can be saved by selecting the icon.
Control Chart
Graph
The graph will display data for the same period that has been set in the CUSUM.
The graph displays
- Accepted areas of data based on the control limit.
- Areas which fall outside of the control limit.
- Data for the period being presented.
Overview
The Overview graph highlights the current target period by default and displays historic and future data.
The Overview Graph can be minimised by clicking the Overview header bar.
Targets
- By default a New Control Target will be created for the user to amend as required. This target is not saved unless you click the Save button.
The targets section details the current control line parameters as well as allowing you to add and remove targets. Reverting the selection and saving the target
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Hints & Tips
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Control Lines
To amend the control lines applied change the control limit.
Alternatively you can manually drag the control lines on the graph, to do this select 
and click and drag on the graph to set desired control limits.
To remove the Control Limits from the graph uncheck 
.
The Targets will only create an event if the first point of data is outside the tolerance range by >5% or if there are two consecutive points of day outside the tolerance range but with the 5% range.