Types of variables. #research #researchmethodology #biostatistics #statistics #variable #rockbritto
Channel: SPM & Research with Dr Rock Britto
Date: 2023-11-21

Types of variables #shorts
#research #statistics #biostatistics #variables 
In research, variables are attributes or characteristics that can vary or take on different values. They are used to measure, manipulate, or categorize information in a study. Variables can be classified into different types based on their nature and the role they play in the research process. Here are the main types of variables:

Independent Variable (IV):

Definition: The variable that is manipulated or changed by the researcher to observe its effect on the dependent variable. It is the cause or predictor variable.
Example: In a study examining the impact of a new drug on blood pressure, the administration of the drug would be the independent variable.
Dependent Variable (DV):

Definition: The variable that is observed or measured to assess the effect of the independent variable. It is the outcome or response variable.
Example: In the same drug study, the blood pressure measurements would be the dependent variable.
Controlled Variables (Constants):

Definition: Variables that are kept constant or controlled to prevent them from influencing the relationship between the independent and dependent variables.
Example: In a plant growth experiment, factors like sunlight, water, and temperature might be controlled to isolate the impact of a specific fertilizer.
Categorical Variables:

Definition: Variables that represent categories or groups and cannot be measured in numerical terms.
Example: Gender (male or female), types of fruits (apple, orange, banana), or educational level (high school, college, graduate).
Continuous Variables:

Definition: Variables that can take on an infinite number of values within a given range and can be measured with precision.
Example: Height, weight, temperature, or age.
Nominal Variables:

Definition: Categorical variables without any inherent order or ranking.
Example: Colors (red, blue, green), types of animals (cat, dog, bird).
Ordinal Variables:

Definition: Categorical variables with a meaningful order or ranking.
Example: Educational level (elementary, high school, college), customer satisfaction ratings (poor, fair, good, excellent).
Discrete Variables:

Definition: Variables that can only take on distinct values and cannot have values between these distinct points.
Example: Number of students in a classroom, number of cars in a parking lot.
Interval Variables:

Definition: Continuous variables with equal intervals between values, but without a true zero point.
Example: Temperature measured in Celsius or Fahrenheit.
Ratio Variables:

Definition: Continuous variables with equal intervals between values and a true zero point.
Example: Height, weight, income.
Understanding the types of variables in research is essential for designing experiments, choosing appropriate statistical analyses, and drawing meaningful conclusions from the study results.

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