Regression

# Regression - Cannot force a zero intercept Only fits linear...

This preview shows pages 1–6. Sign up to view the full content.

Regression

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
A common engineering task is to fit experimental data to a mathematical model. Often the model is simply a fit to a straight line. Other times the model may be quite complex. Excel has several tools to fit models to data.
Consider the following data. What is the best linear fit? The fit that minimizes error (best fit) can be obtained using statistical arguments.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
There are several methods for modeling trends to data in Excel. Each has its own strengths and weaknesses. Builtin functions for linear fit: Slope(y,x) Intercept(y,x) rsq(y,x) Advantages: Updates when data is changed Results are easily used in further calculations Disadvantages:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cannot force a zero intercept Only fits linear data Trendline Fit with Chart Tool Fits several linear regression models besides y=ax+b (see Larsen pp. 160-162) Advantages: Updates when data is changed Multiple model types. Can force model through defined intercept Disadvantages: Equation is not directly transferable to calculations Data Analysis/Regression Fits models of the type: y(x) = A f 1 (x) + B f 2 (x) + … Advantages: Very flexible model types. Can force model through origin Results are useable in further calculations Disadvantages: Fit does not update when original data is changed Must re-run analysis...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern