[Blindmath] Performing Linear Regressions with Excel

[Roopakshi Pathania]

Hi Tina,

Looks like your teacher has asked for a plot showing linear relationship along with the regression equation, and not the actual regression analysis.

Unfortunately, I work with Office 2007, so I can only give you general points. 
There are 2 ways of drawing a plot that you want in Excel.

1.	By ticking the checkbox for the option “Line Fit Plot” in the dialog box for setting up your regression analysis. I believe that the process for reaching that dialog box has already been described.
2.	By choosing the option for a scatter chart from the Insert menu.

Note that in both cases, what you’ll get is a scatter graph showing pairs of values.
But I believe that using the first option gives you a scatter plot with 2 series- one for your actual Y and one for your predicted Y, which may or may not be what you need.

There is more to it than just getting the plot on the spreadsheet; you also have to add a trendline, not to mention displaying the regression equation (Y = alpha + beta X) on the plot itself.
Since I remember nothing about these options from Excel 2003, I’m going to point you to an article.
http://office.microsoft.com/en-us/excel-help/add-a-trendline-to-a-chart-HP005198462.aspx

Regards
Roopakshi

--- On Sat, 10/30/10, Tina Hansen <th404 at comcast.net> wrote:

> From: Tina Hansen <th404 at comcast.net>
> Subject: [Blindmath] Performing Linear Regressions with Excel
> To: "Blind Math list for those interested in mathematics" <blindmath at nfbnet.org>
> Date: Saturday, October 30, 2010, 7:01 AM
> In my current math course, I am being
> asked to create scattergrams of data and then perform linear
> regression, that is, add a line of best fit, to the data and
> get an equasion. Since I don't have an audio graphing
> calculator on my computer, I thought it would be good to try
> it with Excel. I was told that Excel could do what I need,
> but am not sure how to make it happen.
> 
> I am running Excel 2003. If anyone out there can give me
> the steps for performing linear regression with Excel, I'd
> really appreciate your help. Thanks. 
> 
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