Power Spectrum Estimation dialog box

 

Use this dialog box to estimate the power spectrum of selected series.

 

Input

Specifies the worksheet location of the input data for this operation.

 

Valid Input Range

Provides a reference to the extent of the data available in the currently active worksheet. Use this range as a guide for typing valid extents in the Input Range box.

 

Input Range

Type in this box the range of cells containing the data you want to use as input for this command.

 

Series in Rows

Check this box to indicate that the data specified by the Input Range box is organized in rows as opposed to columns (the default).

 

Refer to Specifying Input Arguments for additional information on this subject.

 

Output

Specifies the worksheet location for placing the results of this operation.

 

New Workbook

Select this option to place the results of this operation in a new document workbook.

 

New Sheet

Select this option to place the results of this operation in a new worksheet.

 

Range Position

Select this option to place the results of this operation starting at the worksheet location specified in the box to the right of this option.

 

Refer to Specifying Output Locations for additional information on this subject.

 

Options

 

Estimation Method

Specifies the method that will be used to estimate the power spectrum of the series. Select one of:

 

Periodogram

Select this option to estimate the power spectrum using the periodogram.

 

Averaged

Select this option to estimate the power spectrum using a series of averaged periodograms.  This option will estimate the power spectrum by calculating the periodogram for as many data segments of length Segment Size that can be fitted into the input series using the specified Overlap Type, and then proceed to report the average for each of the frequencies in question.

 

Maximum Entropy

Select this option to estimate the power spectrum using the method of Maximum Entropy or All Poles.

 

Window Type

Specifies a window function that will be applied to the data prior to estimating the power spectrum. If you do not want to apply a window function, set this option to None.

 

Refer to the Apply Window Function dialog box for additional information on this subject.

 

Window Argument

When you select the Dolph-Chebyshev or Kaiser in Window Type, you must specify an additional argument for the window function.

Refer to the Apply Window Function dialog box for additional information on this subject.

 

Plot

Check this box to plot the results of this operation.

 

Method Options

 

Overlap Type

Specifies how the selected data segments will overlap for estimating the power spectrum when using the Averaged method.  Select one of:

 

None

Select this option if you want no overlap between the data segments.

 

Minimum

Select this option to force a one point overlap between the data segments.

 

Specified

Select this option if you want to specify the amount of overlap between the data segments.

Refer to Overlap (size fraction) for additional information on this subject.

 

Maximum

Select this option to force the maximum possible overlap between the data segments, that is, the specified Segment Size minus one.

 

Overlap (size fraction)

Specifies the overlap of each data segment as a fraction of the Segment Size.

 

Segment Size

Specifies the size of the data segments for estimating the power spectrum when using the Averaged method.  Type in this box an integer for the length of data segments.

 

 

Order

Specifies the number of poles that are used when using the Maximum Entropy (All-Poles) method.  Typically, this number is several times smaller than the length of the input series and about the same as the number of sharp features you want the spectrum to identify.

 

OK

Closes the dialog box and carries out this operation.

 

Cancel

Closes the dialog box without carrying out this operation.