## Quantitative Variable

**Definition:**

**Quantitative variable is a variable that has been assigned a numerical value.** This value can be used to represent the frequency, magnitude, or other measurements of the variable. The assigned numerical value can be used to compare the quantitative variables between different groups or to identify trends over time.

### Types of Quantitative Variable

There are two types of Quantitative Variables:

- Discrete variable
- Continuous variable

#### Discrete variable

Discrete variables are those that can only take on a certain number of values. This could be something like the numbers 1 through 10, or it could be a set of distinct objects like a deck of cards. Discrete variables are important in mathematics and statistics because they can often be thought of as points on a graph. This makes them easier to work with than continuous variables, which can take on any value within a certain range.

#### Continuous variable

A continuous variable is a variable whose value can change continuously, without having clear limits. Continuous variables are often used in scientific experiments, because they allow for more accurate measurements. For example, if you were measuring the height of a plant, you could use a continuous variable like centimeters. On the other hand, if you were measuring the number of leaves on a plant, you would use a discrete variable like “one leaf, two leaves, three leaves…”

### Example of Quantitative Variable

Examples of quantitative variables include height, weight, age, and IQ. In research, quantitative variables are often used to measure the relationships between different factors. For example, a researcher may want to know if there is a relationship between IQ and academic achievement. To do this, they would need to collect data on both IQ scores and grades. Once the data is collected, the researcher can then use statistical methods to analyze the relationships between the two variables.

### Purpose of Quantitative Variable

The purpose of a quantitative variable is to allow for the comparison of two or more values. When comparing two or more values, the quantitative variable allows for the determination of which value is greater than, less than, or equal to another value. In addition, the quantitative variable can be used to determine how much greater or how much less one value is in comparison to another.

#### Advantages of Quantitative Variable

There are some advantages of quantitative variables:

- They can be measured objectively. This means that there is less room for error when measuring a quantitative variable.
- They can be easily compared to other quantitative variables. This makes it easy to see relationships between different variables.
- Quantitative variables can be used to make predictions. This is because they are based on past data and patterns.

#### Limitations of Quantitative Variable

- One of the main limitations of quantitative variables is that they can only be used to measure a limited amount of information. For instance, a quantitative variable can only measure the number of times something occurs, but it cannot measure the quality or intensity of the occurrence.
- Another limitation of quantitative variables is that they can be affected by outside factors that are not related to the phenomenon being measured. For example, if the temperature changes during an experiment, this could affect the results even though the temperature is not directly related to the experiment itself.