Bivariate regression analysis is defined as a predictive analysis technique in which:

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journal article

Bivariate Regression Analysis is Useless

Journal of the Royal Statistical Society. Series C (Applied Statistics)

Vol. 12, No. 3 (Nov., 1963)

, pp. 161-179 (19 pages)

Published By: Wiley

https://doi.org/10.2307/2985794

https://www.jstor.org/stable/2985794

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Applied Statistics of the Journal of the Royal Statistical Society was founded in 1952. It promotes papers that are driven by real life problems and that make a novel contribution to the subject. JSTOR provides a digital archive of the print version of Applied Statistics. The electronic version of Applied Statistics is available at http://www.interscience.wiley.com. Authorized users may be able to access the full text articles at this site.

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Linear regression is a basic and commonly used type of predictive analysis.  The overall idea of regression is to examine two things: (1) does a set of predictor variables do a good job in predicting an outcome (dependent) variable?  (2) Which variables in particular are significant predictors of the outcome variable, and in what way do they–indicated by the magnitude and sign of the beta estimates–impact the outcome variable?  These regression estimates are used to explain the relationship between one dependent variable and one or more independent variables.  The simplest form of the regression equation with one dependent and one independent variable is defined by the formula y = c + b*x, where y = estimated dependent variable score, c = constant, b = regression coefficient, and x = score on the independent variable.

Naming the Variables.  There are many names for a regression’s dependent variable.  It may be called an outcome variable, criterion variable, endogenous variable, or regressand.  The independent variables can be called exogenous variables, predictor variables, or regressors.

Three major uses for regression analysis are (1) determining the strength of predictors, (2) forecasting an effect, and (3) trend forecasting.

Bivariate regression analysis is defined as a predictive analysis technique in which:

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First, the regression might be used to identify the strength of the effect that the independent variable(s) have on a dependent variable.  Typical questions are what is the strength of relationship between dose and effect, sales and marketing spending, or age and income.

Second, it can be used to forecast effects or impact of changes.  That is, the regression analysis helps us to understand how much the dependent variable changes with a change in one or more independent variables.  A typical question is, “how much additional sales income do I get for each additional $1000 spent on marketing?”

Third, regression analysis predicts trends and future values.  The regression analysis can be used to get point estimates.  A typical question is, “what will the price of gold be in 6 months?”

Types of Linear Regression

Simple linear regression
1 dependent variable (interval or ratio), 1 independent variable (interval or ratio or dichotomous)

Multiple linear regression
1 dependent variable (interval or ratio) , 2+ independent variables (interval or ratio or dichotomous)

Logistic regression
1 dependent variable (dichotomous), 2+ independent variable(s) (interval or ratio or dichotomous)

Ordinal regression
1 dependent variable (ordinal), 1+ independent variable(s) (nominal or dichotomous)

Multinomial regression
1 dependent variable (nominal), 1+ independent variable(s) (interval or ratio or dichotomous)

Discriminant analysis
1 dependent variable (nominal), 1+ independent variable(s) (interval or ratio)

When selecting the model for the analysis, an important consideration is model fitting.  Adding independent variables to a linear regression model will always increase the explained variance of the model (typically expressed as R²).  However, overfitting can occur by adding too many variables to the model, which reduces model generalizability.  Occam’s razor describes the problem extremely well – a simple model is usually preferable to a more complex model.  Statistically, if a model includes a large number of variables, some of the variables will be statistically significant due to chance alone.

To Reference this Page: Statistics Solutions. (2013). What is Linear Regression . Retrieved from here.

Related Pages:

Assumptions of a Linear Regression

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What is a bivariate regression analysis?

Essentially, Bivariate Regression Analysis involves analysing two variables to establish the strength of the relationship between them. The two variables are frequently denoted as X and Y, with one being an independent variable (or explanatory variable), while the other is a dependent variable (or outcome variable).

Which techniques are used for bivariate analysis?

Examples of other types of bivariate analysis are probit regression, logit regression, rank correlation coefficient, ordered probit, ordered logit, simple regression or vector autoregression. There are certain limitations with Bivariate Research Techniques.

What is bivariate analysis used for?

Bivariate analyses are conducted to determine whether a statistical association exists between two variables, the degree of association if one does exist, and whether one variable may be predicted from another.

What is the purpose of bivariate linear regression?

A form of statistical analysis that uses bivariate data (where both are numerical variables) to examine how knowledge of one of the variables (the explanatory variable) provides information about the values of the other variable (the response variable).