TOOL:
Regression Line Calculator
Proportional Value Method
Regression Line Calculator
Proportional Value Method
Calculate a Regression Line
This interactive page will work only if you have enabled JavaScript. Otherwise, you can follow the how-to instructions provided in the Space Toy Co. case study on calculating a regression line manually, print out the blank worksheet and fill in the form(s) manually.
The interactive worksheet below is made up of tables. By entering data in designated cells of each table on this page, you will calculate Proportional Value (PV) job rates for unmatched female job classes. You must complete the following steps to achieve PV rates.
Note: If you are using the Proxy Comparison method for achieving pay equity, you can use the regression line calculator designed for that purpose.
PLEASE READ BEFORE YOU BEGIN:
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You MUST complete Step 1 before continuing on to Steps 2 and 3.
At Step 1, you enter the number of male and female jobs you'll be working with in this exercise - this will give you the number of rows per table you need for your calculation.
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At Step 2, you enter the male job data (in Table # 1): the representative male job classes are entered in the first column; job values in column A; and job rates in column B (enter this data in descending order). Each cell in columns A and B must contain data.
Click "Compute" at the bottom of the table to activate the regression formula. If you click "Reset", the data in each cell in this table will be erased.
The regression program will generate "output" numbers: Columns C - G will be filled in. The Constant and the Slope values will appear under their own headings below Table # 1. And the R-squared numbers will appear in Table # 2.
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At Step 3, you enter the female job data (in Table # 3): unmatched female job classes are entered in the first column; job values in column A; and job rates in column B. Each cell in columns A and B must contain data.
Click "Compute" at the bottom of the table to apply the formula to the female job data. If you click "Reset", the data in each cell in this table will be erased.
The PV job rate results for the unmatched female job classes will appear in Column C and the required pay equity adjustment in Column D.
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Printing: You can't save your final results to your hard drive, but you can print your calculations by using the 'Print' icon on your browser menu bar. When you exit this page, the tables are automatically reset and all data is erased.
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Record-keeping: For your convenience, we've provided space at the end of this exercise if you wish to record the name of a person inputting the data, a project title, and the date you created your calculation.
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To produce new PV results with new data, reset all the tables and begin again from Step # 1.
Step 1 - Enter the number of male and female jobs you'll be working with
You cannot skip this step. You must enter the number of male jobs (for example, 3) and female jobs (for example, 3) in the cells below, then click "Load the tables". This will give you the correct number of rows you need in each table for your calculation.
Step 2 - Enter the male job data
Enter the representative male job classes in the Male Job Classes column, and the job values and job rates in Columns A and B (in descending order). Click "Compute" at the bottom of the table to activate the regression formula, then move down the page to view your output results. Remember that if you click "Reset", all the data in the table will be erased. Go to Step 3.
R-squared
The table below (Table # 2) contains the calculation that measures how well the job rate line fits the given set of male job data. A higher value of R-squared indicates a better fit.
The R-squared calculation for the male job data is:
Step 3 - Enter the female job data
The final step in this interactive exercise is to enter the female job data. Enter the female job classes in the Female Job Classes column, and the job values and job rates in Columns A and B. Click "Compute" and your PV Job Rate results will automatically appear in Column C and the pay equity adjustment(if any) in Column D. Remember that if you click "Reset", all the data in the table will be erased.
You now have PV job rates for the female job classes that were unmatched under the Job-to-Job approach.
* Optional: Enter a person's name, project name and/or date for record-keeping.
Name*:
Project*:
Date*:
Print your calculations by using the 'Print' icon on your browser menu bar.
More information
You can find more information on Proportional Value and regression analysis by viewing these publications or web pages:
- see how the Space Toy Co. achieved pay equity using Proportional Value;
- read about regression analysis, what it is and what to watch out for;
- read about drawing a free-hand regression line;
- see how the Space Toy Co. used a computer to calculate their PV job rates;
- learn how to calculate PV rates manually (if you don't have JavaScript enabled on your computer).
How do I get more help or information?
We are here to help. We can answer your questions by e-mail at pecinfo.pecinfo@ontario.ca or by phone at (416) 314-1896, or toll-free at 1-800-387-8813. You can also register for a free seminar.
All communications are confidential.
The Pay Equity Commission
This fact sheet is for information only, and is not intended to restrict Review Officers or the Pay Equity Hearings Tribunal in their determination of matters. Refer to the Pay Equity Act for exact interpretation.
