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Excel Data Tables

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Excel Data Tables. Using Excel Data Tables

Back to Excel Formulas , Tips, Tricks & General Use.

Excel Data Tables

Download Data Table example workbook

Data Tables are a range of cells that are used for testing and analyzing outcomes on a large scale.

A Data Table will show you how by changing certain values in your formulas you can affect the result of your formula. Data Tables can store the results of many different scenarios for you in one table, so that you can analyze them to select which scenario is your best option. The results are then written into a table form in your Workbook in a location specified by you. Data Tables are written as array formulas, which therefore allows them to perform multiple calculations in a single location.

There are two types of Data Tables, One-variable data tables and two-variable data tables.

One-variable data tables

The first thing you must do is to create a base or test model and tell your Data Table which formulas from your base model you want to test. This is easily done from inside the Data Table by placing a formula to reference the formula in the base model.

Here is an example:

Lets say that we wish to purchase a new tractor for work on our family farm. We need to know that if interest rates fluctuate we can still afford to pay for the tractor. So we need to know what our loan repayments will be, what our total repayments will be and how much interest we are paying.

Open the attached workbook on the Base Model worksheet. The highlighted cells contain formulas.
Now click on the Worksheet tab named OneVariable Table and notice that this has exactly the same data as the previous table, plus an additional area already set up for the Data Table.
Click in cell E3 and type in =B11, which is the Monthly Loan Repayment
Click in F3 and type in =B13 which is the Total Repayment.
Click in G3 and type in =B14 which is the Total Amount of Interest Paid.
Highlight the range of the table D3:G9, click Data>Table
Leave the first box, Row input cell, blank. Nothing is required for a one-variable table
Click in Column input cell, click on the collapse dialog button and select cell B5 which contains the original interest rate of8.97%
Collapse back through to your Table dialog box and select OK.

You should now see the results of the calculations given the values entered in D4:D9 that would appear in cells B11, B13, and B14 of your base model pasted into the table.

Two-variable Data Tables

You can use a two-variable Data Table to gauge the effect on one formula by changing the value of two input cells within the one table. With this type of table, you can nominate two series of data that can be placed back into the original model into two different input cells. Using the example above, this means that you could nominate a series of interest rates to place in the original interest rate cell (B5) and a series of loan terms to place in the Term of Loan cell (B7). When creating a two-variable table, one series is entered into the first column of the table and the other into the first row of the table. As when creating a one-variable table, the formula reference that we want to test needs to be placed into the blank cell at the top of the first column of the table. The attached workbook shows an example of a Two-variable Data Table.

Rules

A couple of rules for Data Tables:

Set up a "base model"
Do not change the values in the "base model"
It is a good idea to document the area around your data table, so you and other users can tell what it is you are analysing.
You can use Data Tables to change up to two variables only
You can create as many one-variable or two-variable Data Tables as you like in a Workbook.

Download Data Table example workbook

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