PDM
Name
pdm
Purpose (one Line)
Period search by phase dispersion minimization ($\theta$ based).
Description
This routine computes the Theta statistic for period searching
in time-series data using the technique described by Stellingwerf,
ApJ, 224, pp. 953-960 (1978).
Category
Photometry
Calling Sequence
pdm,t,x,sigx0,freq1,freq2,dfreq,freq,period,theta
Inputs
t - independent variable (usually time)
x0 - dependent variable (usually magnitude or intensity)
sigx0 - Uncertainty on x.
freq1 - Lower limit to frequency to compute statistic (units=[1/t])
freq2 - Upper limit to frequency to compute statistic (units=[1/t])
dfreq - Frequency interval. (units=[1/t])
Optional Input Parameters
Keyword Parameters
Outputs
freq - Frequency vector.
period - inverse frequency.
theta - PDM statistic (1 ==> insignificant, 0 ==> significant).
Common Blocks
Side Effects
Restrictions
Procedure
Modification History
Written 1992 Feb 11, by Marc W. Buie, Lowell Observatory