When doing research, variables come in many types. In this lesson, we'll explore the three most common types of variables: continuous. College of Medicine · College of Nursing · College of Pharmacy LO Determine the type (categorical or quantitative) of a given variable. assignment , we cannot say precisely the difference in their scores, only that an A is larger than a B. called qualitative variables, but in this course we'll use the term “ categorical.”. For assessing the linear relationship between two continuous variables, correlation and 8 2 4. An OLS regression model was computed to predict leadership.

**Research Methodology (Part 3 of 3): 28 Types of Variables - Independent & Dependent Variables**

In this lesson, we'll explore the three most common types of variables: Variables Imagine that you are a psychologist and that you want to do a study on whether tall people are smarter. You decide to gather a bunch of people together and get their IQs and height.

If tall people really are smarter, you think, the taller the person is, the higher his IQ will be. Measurement is the process whereby a feature is evaluated. Those features can be things like height or weight, or they could be more psychological in nature, like intelligence or anxiety levels.

In any given study, you are trying to measure or evaluate certain elements that change value depending on certain factors. These are called variables. Think of the word 'vary,' which means 'to change,' and you'll be able to remember variable.

Some variables change from person to person.

### Linear Regression Analysis

For example, height is a variable because it changes from person to person; if everyone in the world was the same exact height, it wouldn't be a variable. Likewise, IQ varies from person to person, so it is another variable. On the contrary, for overlapping or say mutually exclusive classification, wherein the upper class-limit is excluded, is applicable for a continuous variable.

In discrete variable, the range of specified number is complete, which is not in the case of a continuous variable.

Discrete variables are the variables, wherein the values can be obtained by counting. On the other hand, Continuous variables are the random variables that measure something. Discrete variable assumes independent values whereas continuous variable assumes any value in a given range or continuum.

A discrete variable can be graphically represented by isolated points.

## Difference Between Discrete and Continuous Variable

Unlike, a continuous variable which can be indicated on the graph with the help of connected points. Examples Number of printing mistakes in a book. The purpose of statistical evaluation of medical data is often to describe relationships between two variables or among several variables.

For example, one would like to know not just whether patients have high blood pressure, but also whether the likelihood of having high blood pressure is influenced by factors such as age and weight. The variable to be explained blood pressure is called the dependent variable, or, alternatively, the response variable; the variables that explain it age, weight are called independent variables or predictor variables. Measures of association provide an initial impression of the extent of statistical dependence between variables.

If the dependent and independent variables are continuous, as is the case for blood pressure and weight, then a correlation coefficient can be calculated as a measure of the strength of the relationship between them box 1. Describes a monotone relationship A monotone relationship is one in which the dependent variable either rises or sinks continuously as the independent variable rises.

- Definitions of correlation and clarifications
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- Content: Discrete Variable Vs Continuous Variable

Correlation coefficients provide information about the strength and direction of a relationship between two continuous variables. No distinction between the explaining variable and the variable to be explained is necessary: