A **statistical variable** is a characteristic, attribute, or quantity that can assume different values and can be measured or counted within a given population or sample. It's essentially a property that changes across individuals or observations.

**Key Points:**

**Variability:**The defining feature is that the variable takes on**different values**across units of analysis.**Measurable:**The values must be quantifiable, not just qualitative descriptions.**Population vs. Sample:**Variables can be defined for a whole population or a sampled subset.

**Examples:**

**Human height**in centimeters (continuous variable)**Eye color**(categorical variable with specific options)**Annual income**in dollars (continuous variable)**Number of siblings**(discrete variable with whole number values)

**Applications:**

**Research:**Identifying and measuring variables of interest is crucial in research questions and designing studies.**Data analysis:**Different statistical methods are applied based on the type of variable (continuous, categorical, etc.).**Modeling:**Variables are the building blocks of statistical models that explore relationships and make predictions.**Summaries and comparisons:**We use descriptive statistics like averages, medians, and standard deviations to summarize characteristics of variables.

**Types of Variables:**

**Quantitative:**Measurable on a numerical scale (e.g., height, income, age).**Qualitative:**Described by categories or attributes (e.g., eye color, education level, city).**Discrete:**Takes on distinct, countable values (e.g., number of children, shoe size).**Continuous:**Takes on any value within a range (e.g., weight, temperature, time).**Dependent:**Variable being studied and potentially influenced by other variables.**Independent:**Variable influencing the dependent variable.

Understanding variables is crucial for interpreting data, choosing appropriate statistical methods, and drawing valid conclusions from your analysis.

- 1878 reads

## Statistical Tests George Daniel M... contributed on 08-08-2021 05:40

Can you help me to understand different types of statistical tests and their functions and why they are used?

Appreciate your help.

George

## Add new contribution