You can run **AutoFit** below these instructions. Merely supply
the URL to your input data file (or enter your data on this page), set
any desired options, click
**Run Regression**, and the program will develop the model for
you. The input data file can have the dependent variable listed
anywhere in the file, but the first column is assumed if not indicated.
Enter each variable of data as a column of data (not as a row of data).
Separate each number of the data file by a comma or a space. The first
record of the input data file can optionally be a list of variable
names followed by a comma or space. Variable names can be up to 10
characters long, only letters and numbers (embedded spaces not allowed).
If variable names are omitted, then y, x1, x2, etc. will be used.
Missing values are not permitted, each data record must be complete.

If you do not wish to complete the form below,
just email your data to the email address below and the regression will
be run for you, and the results emailed back to you.

**AutoFit** will attempt to
transform the independent variable(s)
(but not the dependent variable) so as to insure a linear relationship
between the independent variable(s) and the dependent variable.
Currently possible transformations are:

- b to the x power, where b is any positive value
- sine in radians of x
- e to the minus x power, where e is the base of natural logarithms
- e to the x power, where e is the base of natural logarithms
- log of x, natural logarithm base e
- x to a power (powers range from -4.0,-3.9,-3.8... to +4.0)

If you choose to use SSS and your model has one or more sine waves, then you must specify the wavelength(s) of those independent variables. As well, if you choose to use SSS and your model has one or more "b to the x" transformations, then you must specify the "b" value of those independent variables.

If you are not using the SSS option, then you do not need to supply
wavelength values for sine transformations since **AutoFit** will calculate them for you. And if you are not using the
SSS option, then you do not need to supply "b" values of "b to x"
transformations since **AutoFit**
will calculate them for you.

When you run the regression, instead of giving you the output on your screen, since most regressions take several minutes to run, the program will submit the regression for processing, emailing you the results when complete, usually within 24 hours.

Your input data does not need to have an intercept term since
**AutoFit** supplies one for you. As well, your input data must
have more records than independent variables, otherwise the
equation cannot be determined. Also, the data must be in text
format, no spreadsheets. If your data
is in a spreadsheet, save it as a ".txt" or ".csv" file.
Only numerical values allowed. Percent signs, currency symbols,
temperature scales, weight scales, etc. are not permitted.
Commas are permitted as delimiters. The letter E is permitted
if part of scientific notation numerical value.
A sample input data file might look
like the following:

percentile, ranking, noiselevel 0.486578286340026 1 21 0.246711000721213 2 23 0.13629187548097 3 33 0.092626329983846 4 41 0.0836961246335616 5 39 0.0823257870395134 6 37 0.0839260785153895 7 35 0.0907101513194246 8 31 0.0948171785407239 9 29 0.0995963399120694 10 27 0.105077813876941 11 25

Other places to do Regression on the World Wide Web

An Introduction to Regression

To email the author of
**AutoFit**
use the email address below