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The difference between a variable and a constant can be confusing. It’s important to understand how they work.

A variable represents a value that varies over time while a constant is a fixed value that doesn’t change. Both variables and constants can be used in mathematical modeling, but they have different roles.

### Variables

Variables are characteristics or elements that can vary in value. Some remain the same (e.g., the number of donuts in a dozen) while others change (e.g., the price of a dozen donuts).

In statistical research and statistics, variables are used to describe people, places, things or ideas. They can also be used to compare two groups or over time.

One of the key aspects of any experiment is that it must include an independent variable and a dependent variable. This relationship between the two is important because it tells how two factors influence each other and what the results of your experiment mean.

In order to ensure that the relationship between an independent variable and a dependent variable is clear, you should keep as many of these factors constant as possible during your experiment. This can be difficult to do, but it is necessary in order to get the most reliable results possible.

### Constants

A constant is a term in an expression or equation that has a fixed value. Variables are terms that change over time and that can be changed in an equation. For example, the height and weight of a person are variables, not constants.

Constants in mathematics can be symbols, numbers, or names of mathematicians. These symbols can then be used to create expressions and equations, which are a means of finding an unknown value.

They are usually represented by a lowercase letter, number 0-9, an underscore (_), or an inverted comma. Dots are also allowed, but they have special meaning as delimiters in namespaces.

Some people choose to define their constants simultaneously with the code that uses them, which makes it easy to maintain and organize them. This approach is especially useful if you use constants across multiple modules and packages within your project.

### Parameters

Parameters are a fixed measure that describes a population of elements, and are also used in statistics. The difference between a parameter and a statistic is that parameters are numbers that describe an entire group, while statistics are sample-based.

When you want to make an inference about a group of elements, the best way to do that is to use a parameter or statistic. This is because it would be impossible to collect data on every single element in a population.

For example, if you want to know how many people support a particular law in your city, you may need to collect a sample of residents and use their mean to estimate the parameter. This would then be the best guess at the population proportion of those residents who support the law.

### Definitions

In mathematics, a constant is a value that does not change over time. Constants can be any type of number, including an integer or fraction, and can appear in equations and expressions.

Similarly, parameters are values that influence the output or behavior of a mathematical object but are viewed as being held constant. The slope and intercept of a straight line in slope-intercept form, for example, are parameters.

The word parameter originated from the Greek words para and metron, meaning “beside” and “measure,” respectively. Often, the difference between variables and parameters is simply a matter of perspective.

In Stream Base, you can define constants for use in component attributes, as parameters for JS functions, and in actions (such as if). You also add an on Value Changed event to constants when their value changes.