# The Problem With Regression Analysis: 8 Mistakes That Every Statistician Makes

One of the most popular and effective multidimensional statistical approaches is regression analysis. It postulates the nature and extent of significant relationships between the variables in a data set. Once you understand how to apply regression, you can identify and determine the relationship between two or more variables. Regression methods help researchers make inferences and forecast future outcomes and behaviours. For example, sales forecasts and weather forecasts depend upon the regression analysis. However, there are some common mistakes that every statistician mistakes in regression methods. These mistakes compromise the validity of the results and lead to incorrect inferences and predictions. This article will tell you about the eight mistakes that every statistician makes in regression analysis.

## What Are The Eight Common Mistakes That Statisticians Commit In Regression Analysis?

### Combining Non-Linear With Linear Data

In regression analysis combing the linear data with non-linear data is a bad choice. It leads to poor results and makes wrong predictions. Statisticians fall prey to this error when they do not explore the data properly. Researchers can avoid this error by first determining the relationship between independent variables. Secondly, researchers must measure the correlation coefficients and perform a component analysis to avoid inaccurate synthesis. The optimum way is to first identify the relationship between two variables. The researcher can combine the non-linear data into linear data after establishing a relationship between variables.

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### Relying Too Much On Automated Models

The second mistake statisticians make is avoiding the knowledge-based approach to regression analysis and instead focusing on automated models. Automated models are helpful in exploratory research studies but are not useful in making predictions. Statisticians must conduct thorough research to understand the research variables and their relationships. They can avoid the regression error by examining the coefficient relationships and effect magnitudes of variables. Once researchers have accurate data at their disposal, they can use the best regression methods to analyse it.

### Confusing Correlation for Causation

Correlation does not imply causation. However, statisticians forget this simple rule in regression analysis and commit the error of signifying correlation as causation. It is a common mistake when statisticians build regression models with R-squared functions. Causation is an entirely different concept. It requires designing a randomised experiment to detect causation. You cannot be sure about causation if you are using regression to evaluate data that you did not gather in such an experiment.

### Using Dummy Variables

Statisticians often use dummy variables that lead to errors in regression analysis. This error pertains to using two mutually exclusive variables. For instance, when you have to analyse the subscription services of a bank, and you select two variables, silver and gold cards. These two variables are exclusive because people who have silver cards do not possess gold cards. So, it means that the variables are mutually exclusive. Statisticians get tempted to use two variables in regression analysis.

One variable might signify that the user has a gold card, and the other variable indicates if the customer has a silver card subscription. The next step entails coding the data in the form of multicollinearity. It lets the variables predict each other in a better way. The issue is that ideal multicollinearity does not provide sufficient variance for the model to compute accurately. The entire model disintegrates as a result. An error warning will show up when attempting to actually conduct regression with completely linked variables. Statisticians can avoid this error by dropping one of the variables.

### Inclusion Of Highly Correlated Variables

The inclusion of highly correlated variables in regression analysis leads to errors. The inclusion of highly correlated variables contributes to a degree of variability. However, inclusion does not necessitate avoiding the skewed distribution. So, researchers can avoid this error by dropping one of the variables.

### Prejudiced Data

It is often the case in regression analysis that statisticians include biased data, which leads to errors. Biased data results from a selection of data in a biased manner. For example, preferring a sample over another due to subjective opinions and beliefs. Biased samples are unrepresentative of the subject population and cause measurement errors. It leads to findings that are approximate but not valid due to the inclusion of biased data. Non-random samples are biased in most cases, and the data is not generalisable beyond the population sample.

### Unclear Aims And Objectives

One of the common regression mistakes arises due to the researcher's inability to specify the aims and objectives of regression. Regression analysis entails the identification of variation in the value of the dependent variable based on the changes in the independent variable. Researchers must explain the rate of response to avoid this error. The key is to identify the functional relationships which exist between the variables.

### Outliers and Mismanagement of Significant Data Points

Problems occur in regression analysis when the statistician does not identify and eradicate the outliers. Outliers are those data points that diverge significantly from the data points. Outliers in the data sets occur when the researcher does not enter the data properly. It happens as a result of mismanagement of data. Measurement and computation errors also lead to data outliers. Sampling errors create outliers in the data sets.

Outliers are the abnormalities that occur in the data sets. When the outlier in the data set goes undetected, it leads to errors in regression. It affects the research results and leads to invalid findings. Outlier detection and eradication are necessary for increasing data comprehensibility and avoiding errors in regression. Regression requires comprehensible and clear data points for establishing the correlation and causation between variables. Data management is another step researchers must take to avoid the loss of important information.

## Conclusion

The common errors that occur in regression analysis are due to the incomprehensibility of statisticians of regression basics. They can avoid these errors by apprehending the basics of regression and specifying the functional relationships between variables. A thorough research is necessary for understanding the relationship between variables and demonstrating the impact of one over another.