pre-assumptions_of_regression_analysis
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pre-assumptions_of_regression_analysis [2016/04/27 08:09] – hkimscil | pre-assumptions_of_regression_analysis [2016/05/11 08:37] (current) – [Outliers] hkimscil | ||
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====== pre-asumptions in regression test ====== | ====== pre-asumptions in regression test ====== | ||
* [[Linearity]] - the relationships between the predictors and the outcome variable should be linear | * [[Linearity]] - the relationships between the predictors and the outcome variable should be linear | ||
- | * [Normality]] - the errors should be normally distributed - technically normality is necessary only for the t-tests to be valid, estimation of the coefficients only requires that the errors be identically and independently distributed | + | * [[:Normality]] - the errors should be normally distributed - technically normality is necessary only for the t-tests to be valid, estimation of the coefficients only requires that the errors be identically and independently distributed |
* [[: | * [[: | ||
* Independence - the errors associated with one observation are not correlated with the errors of any other observation | * Independence - the errors associated with one observation are not correlated with the errors of any other observation | ||
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* [[Influence]] - individual observations that exert undue influence on the coefficients | * [[Influence]] - individual observations that exert undue influence on the coefficients | ||
- | * [[Collinearity]] or [Singularity] - predictors that are highly collinear, i.e. linearly related, can cause problems in estimating the regression coefficients. | + | * [[Collinearity]] or [[Singularity]] - predictors that are highly collinear, i.e. linearly related, can cause problems in estimating the regression coefficients. |
===== Outliers ===== | ===== Outliers ===== | ||
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| **Model Summary(b) ** | | **Model Summary(b) ** | ||
| Model | | Model | ||
- | | 1 | + | | 1 |
| a Predictors: (Constant), income | | a Predictors: (Constant), income | ||
| b Dependent Variable: sales | | b Dependent Variable: sales |
pre-assumptions_of_regression_analysis.1461713950.txt.gz · Last modified: 2016/04/27 08:09 by hkimscil