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Interactive Labs

Demographics Lab

Tools of the Simulator

Simulator Controls

Pause Button
Stops the progression of the simulator at the moment it is clicked.
Reset Button
Returns the simulator to year 2005.
Step
Simulates the progression of population as determined by the parameters for five years.
Run
Simulates the progression of population as determined by the parameters for forty-five years.

Simulator Parameters

Average Birth Rate
This button indicates the default average birth rate for the chosen country (see COUNTRY in the top right corner) for the starting year of the simulator. Clicking on the notepad and pencil icon on the right will open up the Change Birth Rates window that allows you to alter the average birth rate.
Use Rates From: Use the pull-down menu to choose a country from the seven countries modeled in the simulator: USA, China, Egypt, India, Italy, Mexico or Nigeria. You may then proceed to change the average birth rate for that country.
+/- 5%: Up/down arrow buttons allow you to change the average birth rate by increasing (up arrow) or decreasing (down arrow) by five percent the average number of children born per year. As an arrow is clicked, the bar graph below will change to reflect the increase or decrease in average number of children born per five years.
- 5 years/+ 5 years: Right/left arrow buttons allow you to change the average age of child-bearing women by increasing (right arrow) or decreasing (left arrow) the average age of the mother. As an arrow is clicked, the bar graph below will change to reflect the increase or decrease in the average number of children born per five years in each age group.
Average: This number (in red) indicates the average number of children born per individual woman throughout the country for the starting year of the simulator. This is the same number that will appear in the Average Birth Rate button on the main simulator screen.
Bar Graph: This graph shows the progression of the average number of children born every five years per age group as a function of the number of children born every five years versus the age group giving birth to the children.
OK: This button accepts the parameters you've set in the window for average birth rate. It will bring you back to the main simulator screen.
Cancel: This button brings you back to the main simulator screen without altering any parameters. The simulator will run numbers and approximations from whatever parameters were previously set.
Average Death Rate
This button indicates the default average death rate for the selected country (see COUNTRY in the top right corner) for the starting year of the simulator. Clicking on the notepad and pencil icon on the right will open up the Change Death Rates window that allows you to alter the average death rate.
Use Rates From: Use the pull-down menu to choose a country from the seven countries modeled in the simulator: USA, China, Egypt, India, Italy, Mexico or Nigeria. You may then proceed to change the average death rate for that country.
+/- 50%: Up/down arrow buttons change the average death rate by increasing (up arrow) or decreasing (down arrow) by fifty percent the average number of people who die each year. As an arrow is clicked, the bar graph below will change to reflect the increase or decrease in average number of people expiring as a percentage of the total population of that country.
- 5 years/+ 5 years: Right/left arrow buttons change the average age at which people in that country will die by increasing (right arrow) or decreasing (left arrow) the average age of expiration. As an arrow is clicked, the bar graph below will change to reflect the increase or decrease in the average number of people dying in each age group as a percentage of the total population.
Average: This number (in red) gives the average percentage of the total population of deceased persons for the starting year in the simulator. This is the same number that will appear in the Average Death Rate button on the main simulator screen.
Bar Graph: This graph shows the progression of the average number of deceased per age group as a function of the percentage dead of the total population versus the number of persons dying per age group.
OK: This button accepts the parameters you've set in the window for average death rate. It will bring you back to the main simulator screen.
Cancel: This button brings you back to the main simulator screen without altering any parameters. The simulator will run numbers and approximations from whatever parameters were previously set.
Population Growth
This button, outlined in red, indicates, as a function of birth and death rates, the percentage increase (positive percentage) or decrease (negative percentage) of the population numbers relative to the original population number of that country.
COUNTRY
This pull-down menu allows you to choose a country from the seven countries modeled in the simulator: USA, China, Egypt, India, Italy, Mexico or Nigeria. Note that the country that you currently are exploring will be seen in red on the map behind the country menu.

Population Line Graph on Main Simulator

This graph shows the progression of population growth for the selected country. The legend box may be moved by dragging it with your mouse. The y-axis is the population (in millions) of that country for the year displayed in the x-axis.

Projected, Simulated, and Now lines on the graph
Projected: Represents the projected population growth of the selected country based on demographic transition data of the 2006 World Population Data Sheet (See Unit 5 text, Section 3, Footnote 6).
Simulated: Represents population growth for the selected country based on the parameters you set in Average Birth Rate and Average Death Rate. Using those numbers, the simulator will run a projection for the length of time you determine. (Step = 5 years or a multiple of five, depending on how many times you click "Step" or Run = 45 years or a multiple of 45, depending on how many times you click "Run".)
Now: Refers to the diamond on the line. The diamond tells you what year it is at the current moment within the world of the simulator. Using your mouse to rollover the diamond (or ANY point on the graph or illustration) will result in a pop-up data box that gives the statistics for that moment in the simulation.
Show age 65+ check box:
This box, when checked, will add a line that represents the number of people in millions over the age of 65 living in that country per year.

Population By Age Group Bar Graph on Main Simulator

This graph shows the population (as number of people in millions), per age group by gender. The blue bars represent the numbers of males and the pink bars represent the numbers of females. The light grey vertical lines in the background demarcate population numbers for every 5 million people. The total population for any year for any country will be the sum total of all bars for both males and females. Each bar represents an age group: 0-4 years, 5-9 years, 10-14 years, etc. As the population ages each year in the simulation, the graph will change to reflect the differences.

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