Difference between revisions of "SOCR EduMaterials Activities ParetoEstimateExperiment"

From SOCR
Jump to: navigation, search
(Description)
(Description)
 
Line 3: Line 3:
 
== Description ==
 
== Description ==
  
The experiment is to generate a random sample <math>X_1, X_2, ..., X_n</math> of size ''n'' from the Pareto distribution with parameter ''a''. The distribution density is shown in blue in the graph, and on each update, the sample density is shown in red. One each update, the following statistics are recorded:  
+
The experiment is to generate a random sample <math>X_1, X_2, ..., X_n</math> of size ''n'' from the [http://www.SOCR.ucla.edu/htmls/SOCR_Distributions.html Pareto distribution] with (power) parameter ''a''. The distribution density is shown in blue in the graph, and on each update, the sample density is shown in red. One each update, the following statistics are recorded:  
 
<math>U = {M\over{(M-1)}}</math>, where <math>M = {X_1 + X_2 + ... + X_n \over{n}}</math> and
 
<math>U = {M\over{(M-1)}}</math>, where <math>M = {X_1 + X_2 + ... + X_n \over{n}}</math> and
 
<math>V = {n\over {\ln(X_1) + \ln(X_2) + ... + \ln(X_n)}}</math>
 
<math>V = {n\over {\ln(X_1) + \ln(X_2) + ... + \ln(X_n)}}</math>

Latest revision as of 19:24, 25 May 2007

Pareto Estimate Experiment

Description

The experiment is to generate a random sample \(X_1, X_2, ..., X_n\) of size n from the Pareto distribution with (power) parameter a. The distribution density is shown in blue in the graph, and on each update, the sample density is shown in red. One each update, the following statistics are recorded\[U = {M\over{(M-1)}}\], where \(M = {X_1 + X_2 + ... + X_n \over{n}}\) and \(V = {n\over {\ln(X_1) + \ln(X_2) + ... + \ln(X_n)}}\) Statistics U and V are point estimators of a. As the experiment runs, the empirical bias and mean square error of each estimator are recorded in the second table. The parameters a and n can be varied with scroll bars.

Goal

To provide a simulation demonstrating properties of the Pareto distribution that deals with continuous probability distributions. In addition, the Pareto distribution is relative to the exponential distribution as well as the gamma distribution so after experimenting with this applet, users should be able to develop a generalization for these three types of distributions.

Experiment

Go to the SOCR Experiments and select the Pareto Estimate Experiment from the drop-down list of experiments on the top left. The image below shows the initial view of this experiment:


SOCR Activities ParetoEstimateExperiment Chui-051907 Fig1.jpg


When pressing the play button, one trial will be executed and recorded in the distribution table below. The fast forward button symbolizes the nth number of trials to be executed each time. The stop button ceases any activity and is helpful when the experimenter chooses “continuous,” indicating an infinite number of events. The fourth button will reset the entire experiment, deleting all previous information and data collected. The “update” scroll indicates nth number of trials (1, 10, 100, or 1000) performed when selecting the fast forward button and the “stop” scroll indicates the maximum number of trials in the experiment.


Since parameter a may be varied according to the user, the smaller the value, the more skewed right the distribution graph will be. When a consists a large value, it is still skewed right but the distribution graph is less curved. The image below shown below demonstrates both changes in a:


SOCR Activities ParetoEstimateExperiment Chui-051907 Fig2.jpg
SOCR Activities ParetoEstimateExperiment Chui-051907 Fig3.jpg

Note that the empirical density and moments graph begin to converge to the distribution graph after every trial. In other words, the empirical graph is more saturated at the left side of the graph because the distribution graph obtains maximum values on this side. The spread of the empirical graph is rather large but most of the values are towards the left with outliers on the right. The image shown below demonstrates this:

SOCR Activities ParetoEstimateExperiment Chui-051907 Fig4.jpg

Applications

The Pareto Estimate Experiment is an applet that generalizes the important of experiments involving continuous probability distributions. It may be used in many different types of examples:

Suppose contractors want to find out the mean, median, and mode as well as the characteristics of the probability density function of the sizes of sand particles at their work site.

Scientists obtained numbers of species per genus and want to gather all data information to develop a probability density graph that will represent their findings.

Environmentalists want to prevent forest fires so they are interested in developing a representation for all the areas burnt from forest fires to illustrate which field of study should be their main focus.




Translate this page:

(default)
Uk flag.gif

Deutsch
De flag.gif

Español
Es flag.gif

Français
Fr flag.gif

Italiano
It flag.gif

Português
Pt flag.gif

日本語
Jp flag.gif

България
Bg flag.gif

الامارات العربية المتحدة
Ae flag.gif

Suomi
Fi flag.gif

इस भाषा में
In flag.gif

Norge
No flag.png

한국어
Kr flag.gif

中文
Cn flag.gif

繁体中文
Cn flag.gif

Русский
Ru flag.gif

Nederlands
Nl flag.gif

Ελληνικά
Gr flag.gif

Hrvatska
Hr flag.gif

Česká republika
Cz flag.gif

Danmark
Dk flag.gif

Polska
Pl flag.png

România
Ro flag.png

Sverige
Se flag.gif