[PDF] [PDF] Chapter 10, Using Excel: Correlation and Regression - CosmosWeb

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1

Chapter 10, Using Excel:

Correlation and Regression

Correlation and Regression with just Excel.Play Video.This video shows you how to get the correlation coecient, scatterplot, regression line, and regression

equation. These tasks do not require the Analysis ToolPak or StatPlus:mac LE. Everything can be

done easily with the out-of-the-package copy of Excel. It's one of Excel's best statistical features.

Additional Regression Information with the Analysis ToolPak (Windows Users)2 Additional Regression Information with StatPlus:mac LE (Mac Users)3 Getting and Running the Analysis ToolPak and StatPlus LE4 2 Additional Regression Information with the Analysis ToolPak (Windows

Users)

Correlation coecient(s) with the Analysis ToolPak.

1.Datatab!Data Analysis!Correlation

2. Hig hlightall the columns con tainingv ariablesy oususp ectare correlated. 3. C heckLabels in First Rowonly if you highlighted the top row labels. 4. C lickthe Output Range:and select a place for the output by clicking on a cell. It will create an nxnarray wherenis the number of variables (columns). 5. C lickOKand this will produce an array of correlation coecients between all of the variables repre- sented by the columns. It's good for seeing which of many variables are most strongly correlated.

The regression option with the Analyis ToolPak:

1.Datatab!Data Analysis!Regression

2.

En terthe X and Y data b yhighligh tingit.

3. C hecklabelsonly if you highlighted the top row labels. 4.

Do n'tc heckconstant is zeroorconfidence level.

5. C lickthe Output Range:and choose an output location by clicking on a cell. 6.

C lickOKand you get results like those below.{Multiple Ris the correlation coecient =randR-square=r2.

{Adjusted R-squareis a more appropriate value when the data comes from a sample. {Standard Erroris the standard error used in calculating a prediction interval ofyfor a given value ofx. {Significance Fdenotes theP-value of the test statistic used in a hypothesis test withH0:= 0. If it is less than, we reject the null hypothesis and conclude there is a linear correlation between the population variables. {Coefficientsgive they-intercept and the slope of the regression equation. 3 Additional Regression Information with StatPlus:mac LE (Mac Users)

1.Statplus!Statistics!Regression!Linear Regression

2.

S electthe dep endentv ariabledata (Y data)

3.

S electthe indep endentv ariabledata (X data)

4.

C heckLabels in the first rowif that is the case.

5. C lickOKand you get results like the ones below.{Ris the correlation coecient =randR Square=r2. {Adjusted R-squareis a more appropriate value when the data comes from a sample. {Standard Erroris the standard error used in calculating a prediction interval ofyfor a given value ofx. {p-leveldenotes theP-value of the test statistic used in a hypothesis test withH0:= 0. If it is less than, we reject the null hypothesis and conclude that there is a correlation between the population variables. {Coefficientsgive they-intercept and the slope of the regression equation. 4 Getting and Running the Analysis ToolPak and StatPlus LE

Installing Analysis T oolPak(Windows Only)

1.

O pena blank Excel spreadsheet.

2. C lickon the windo wsicon (pre 2010) or the le tab ( 2010+). 3. C hooseExcel Options (pre 2010) or just options (2010+). 4.

C hooseadd-ins.

5. In manage (b ottomof windo w),c hooseExcel Add -insand clic kGo. 6. C heckthe b oxthat sa ysAnalysis T oolPakand clic kOK. 7. Afte ry ouload the Anal ysisT oolPak,the Data Analysis command is a vailableunder the Data tab. It should be the far right option.

Getting StatPlus LE (Mac Only)

As of this writing, if you are running Excel 2008 or higher on a Mac, the Analysis ToolPak is not available. There is an application called StatPlus:mac LE which is a free version of the full StatPlus application. It can handle most of the tasks performed by the Analysis ToolPak and the full version is probably superior - but that costs money. Once you download the software from http://www.analystsoft.com/en/products/statplusmacle/, 1.

Ru nStatPlus from the Applications F older.

2. If y oudon't already ha veExcel op en,it will op enit for y ou. 3. Y ouwill run the commands from the StatPlus men u(top men ubar). 4. C hoosethe appropriate cells from the Excel w orksheetcon tainingthe data. 5. T heresults are prin tedto a separate Excel w orksheet. 6. Y oucan then cut and p astethese results i nthe Excel W orksheetthat con tainsthe data.quotesdbs_dbs14.pdfusesText_20