User`s guide

Monte Carlo Analysis 13
-23
The statistics for the histogram are displayed 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. Ten percent of the goa1 function
values are less than or equal to the 10th percentile number, and
90% of the goal function values are 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.
We can also show the distribution of the center frequency of our
filter.
To displa
y
the center frequenc
y
1
From the Trace menu, select Add.
2
In the Goal Functions list, select:
CenterFreq(1, db_level).
3
In the Simulation Output Variables list, select V(OUT).
4
In the Trace Command text box, position the cursor after the
V in CenterFreq(V(OUT) , ) and type
DB.
The text box should now read like this:
CenterFreq(VDB(OUT) , )
5
In the Trace Command text box, position the cursor after the
comma and type
1 for the 1 dB level.
The text box should now read like this:
CenterFreq(VDB(OUT) , 1)
6
Click OK to view the histogram.
The new histogram replaces the previous histogram. To display
both histograms at once, use Add Plot on the Plot menu before
selecting Add from the Trace menu. The histogram of the center
frequency is as shown in Figure 13-11.
If needed, you can turn off the
statistical data display as follows:
1
From the Tools menu, select
Options.
2
Clear the Display Statistics
check box.
3
Click Save, and then OK.