User Guide

Monte Carlo analysis
305
The statistics for the histogram are shown along the
bottom of the display. The statistics show the number of
Monte Carlo runs, the number of divisions or vertical bars
that make up the histogram, mean, sigma, minimum,
maximum, 10th percentile, median, and 90th percentile.
You can also show the distribution of the center frequency
of the filter.
To display the center frequency
1 From the Trace menu, choose Goal Functions.
2 Choose CenterFreq.
3 Click Eval.
4 Enter VDB(OUT) in the Name of trace to search text
box.
5 Enter 1 in the db level down for measurement text
box.
6 Click OK, then click Close to view the histogram.
The new histogram replaces the previous histogram. To
display both histograms at once, choose Add Plot to
Window on the Plot menu before choosing Add from the
Trace menu. The histogram of the center frequency is as
shown in Figure 83.
Figure 82 1 dB bandwidth histogram.
I
f
nee
d
e
d
, you can turn o
ff
t
h
e statistica
l
data display as follows:
1 From the Tools menu, choose Options.
2 Clear the Display Statistics check box.
3 Click Save, and then OK.
Ten percent o
f
t
h
e goa
l
f
unction va
l
ues is
less than or equal to the 10th percentile
number, and 90% of the goal function
values is greater than or equal to that
number.
If there is more than one goal function
value that satisfies this criteria, then the
10th percentile is the midpoint of the
interval between the goal function values
that satisfy the criteria. Similarly, the
median and 90th percentile numbers
represent goal function values such that
50% and 90% (respectively) of the goal
function values are less than or equal to
those numbers.
Sigma is the standard deviation of the goal
function values.
Pspug.book Page 305 Wednesday, November 11, 1998 1:14 PM