Data Requirements for Excel Anova
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q267281
The Microsoft site has an example of data format for pre-post test.
SYMPTOMS
When you use "Anova: Two-Factor With Replication" in the Data Analysis tools, you may receive one of the following error messages:
Anova: Two-Factor With Replication - Each sample must contain the same number of rows.
-or-
Anova: Two-Factor With Replication - Input range should contain two or more blocks of data arranged in rows or columns.
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CAUSE
This problem may occur when the input range that you specify does not contain data with the correct layout or labels. Anova: Two-Factor With Replication requires that you include labels for each group and each trial as shown in the More Information section of this article.
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RESOLUTION
Use both column and row labels for your input data range.
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MORE INFORMATION
The following data could be used to analyze two trials for two groups:
A1 : B1 : Group 1 C1 : Group 2
A2 : Trial 1 B2 : 75 C2 : 59
A3 : B3 : 68 C3 : 56
A4 : B4 : 71 C4 : 61
A5 : B5 : 75 C5 : 60
A6 : Trial 2 B6 : 66 C6 : 62
A7 : B7 : 70 C7 : 60
A8 : B8 : 68 C8 : 59
A9 : B9 : 68 C9 : 68
To analyze this data using Anova: Two-Factor With Replication, the input range would include A1:C9 and the number of rows would be 4.
posted by Richard @ 1:17 PM
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