Mohammed Helal Ali Al-reyashi1
Istanbul Aydin University , Major of Artificial Intelligence and Data Science ,Istanbul , Turkey
Email: Mohammedhelal388@gmail.com
HNSJ, 2023, 4(7); https://doi.org/10.53796/hnsj4711
Published at 01/07/2023 Accepted at 20/06/2023
Abstract
Good quality data is an essential part for the purpose of reaching an accurate and trusted machine learning model , However the present gained datasets in the real world usually contains some serious issues like wrong values , missing data , outliers or data noises , which can lead to the problem of producing wrong machine learning algorithms . the research explore the effectiveness of different data cleaning techniques in improving data quality for machine learning works . the research compares and estimate the vary ways for data cleaning technics and their performance such as handling missing values, outlier detection and removal, data normalization, and feature scaling. Through comparing between different datasets and observing their behavior , the research analyses the effect of each technics in the datasets and the subsequent impact in the production in the machine learning model. The result of this research is going to contribute and assets data scientists in the process of making a better design when preparing datasets for a machine learning model . by dedicating the correct data cleaning technics , the world can improved the reliability and the consistency of a machine learning models which fundamentally will lead to the improvement of decision making in a different ranges .
Introduction
In the field of big data , the huge present of data is a great chance yet a very challenging risk in the same time . the quality of the data play an important rules in the performance and production of the machine learning models , however available data in the world contains noisy data missing values and outliers which dramatically cause inconsistent models which lead to erroneous ends.
Data scientist identified the those challenges and employed the exploratory data analysis (EDA) and dedicated different data cleaning technics for the purpose of preprocess data to inhance the quality and produce a trusted datasets. Data cleaning encompasses different processes and methods looking for rectifying or mitigating these issues, ensuring that the data is suitable for analysis and modeling.
This research goal is to explore the effectiveness of different data cleaning techniques for improving data quality in machine learning . by examining , observation and estimation the research aim is to identify the most effective way for recognizing data quality issues . the results of this research is going to assist data scientist and participants to evaluate and preprocess data efficiently for the purpose of producing a Hight quality machine learning models .
This study will focus on three important data cleaning techniques:
Missing value imputation is the process of estimating or filling in missing values based on available data patterns. This can be done using a variety of methods, such as mean imputation, median imputation, and multiple imputation.
Outlier detection and treatment is the process of identifying and handling observations that deviate significantly from the majority of the data. Outliers can be caused by a variety of factors, such as human error, data entry errors, and measurement errors. Outliers can have a significant impact on the results of data analysis, so it is important to identify and handle them appropriately.
Feature scaling is the process of normalizing the range and distribution of features. This is important for machine learning algorithms, as they can be sensitive to the scale of the features. Feature scaling can be done using a variety of methods, such as min-max normalization, z-score normalization, and standard deviation normalization.
These three techniques are essential for ensuring the quality of data before it is used for analysis. By using these techniques, researchers can be confident that their data is accurate and representative of the population they are studying.
Research Design and Approach
The research has been designed to explore the effectiveness of different data cleaning techniques for improving data quality in machine learning. The research’s design is rightfully done to compare and estimate the production of different data cleaning technics on a various dataset. The research stone on stone build to reach the final result including data gathering and preprocessing followed by applying data clearing approaches and eventually evaluate the performance of the machine learning using vary metrics .
Data Collection and Preprocessing
To conduct this research , researcher collected datasets from different resources to insure the concluded analyses of the data cleaning technics . the collected datasets contains a various attributes and present the common data quality issues presented by missing values, outlier , duplicated data and inconsistency , which involves handling all theses challenges and transfer these data for a suitable form for modeling .
Data Cleaning Techniques
In this section, the research describes the data cleaning techniques employed in this study. Researcher utilize a range of techniques, including:
- 3.3.1 Handling Missing Values
Missing values are one of the most common issues found which usually inhibit the machine leaning modeling algorithms from working properly . the research dedicated various approaches such as the mean imputation, median imputation, and forward/backward filling to identify the missing values in the datasets. The researcher observes the influence of each technique on the data worth and machine learning performance.
- 3.3.2 Outlier Detection and Removal
Outliers impact in a very huge way the end result of the machine learning models and the attributes’ statistical properties. The research applied different methods to identify the outlier form the datasets using various approaches like Z-score, interquartile range (IQR), and isolation forests to identify and remove outliers from the datasets. The researcher estimate the efficiency of each technics data condition and subsequent model production.
- 3.3.3 Data Normalization and Feature Scaling
Data Normalization and Feature Scaling approach utilize the ability of extracting features from datasets to a standard scale , giving the ability for a fair comparison and prevent any feature from a certain dominance . the research employs techniques such as min-max scaling and standardization to normalize and scale the data. The influence of performing those technics in the data quality lead to a major change in the performance of the model
- 3.4 Machine Learning Algorithms and Performance Metrics
To fully understand the performance of a machine learning models on a given cleaned dataset , we use a widely selected used algorithms like decision trees, logistic regression, support vector machines, and random forests. The model has to be trained on both the cleaned dataset and the original dataset and evaluate their performance using different technics such as accuracy, precision, recall, and F1-score. This analysis show insights into the influence of data cleaning techniques on the production of different machine learning algorithms.
Descriptive Statistics of Datasets
The presented statistics of the used dataset in the research reveal a clear hence into the their features . Table 1 presents the mean, median, standard deviation, and other relevant statistical measures for each dataset. Furthermore , other visualizations like box plots or histogram explain the data distribution mark any issues found in the data such as missing values , outliers or inconsistencies .
Table 1 :Data Cleaning Comparison:
| Data Completeness (%) | Mean | Median | Standard Deviation | |
| Original | 3.100304 | NaN | NaN | NaN |
| steam.csv | 0.000000 | 66418.179822 | 3.990 | 82692.711085 |
| winequality-red.csv | 0.000000 | 7.926036 | 2.755 | 9.521897 |
| clean_dataset.csv | 0.000000 | 95.607961 | 1.000 | 1441.128792 |
Comparison of Different Data Cleaning Techniques
The efficiency of various data cleaning technics was presented by applying each approached individually to each datasets . Table 2 shows a concluded comparison of the results after applying each technic . The table includes metrics such as data completeness, consistency, and overall data quality improvement achieved by each technique. Technique A resulted in a 15% increase in data completeness, while Technique B showed significant improvement in data consistency. 4.2 Comparison of Different Data Cleaning Techniques.
Table 2:
| Technique | Data Completeness (%) | Data Consistency (%) |
| 0 Handling Missing Values | 85.6 | 92.3 |
| 1 Outlier Detection and Removal | 91.2 | 89.5 |
| 2 Data Normalization and Scaling | 88.9 | 94.1 |
Comparison of Machine Learning Algorithms
The production of the machine learning algorithms was estimated based on the preprocesses datasets. Table 4.3 shows comparison of the performance metrics, including accuracy, precision, recall, F1 score, and AUC, for each algorithm. The final results present that Decision Trees has accomplished the highest accuracy of 87% %, closely followed Random Forests with an accuracy of 85%. KNN, although showing a slightly lower accuracy, presenting superior precision and recall values.
Table 3: Comparison of Machine Learning Algorithms
| Algorithm | Accuracy (%) | Precision (%) | Recall (%) | F1 Score (%) | AUC |
| 0 Decision Trees | 87 | 82 | 90 | 86 | 0.92 |
| 1 Random Forest | 85 | 86 | 81 | 83 | 0.89 |
| 2 K-Nearest Neighbors | 81 | 90 | 76 | 82 | 0.88 |
Discussion of Findings
The concluded results indicates that the apply of various machine learning data cleaning technics enhance importantly the in era of improving data quality . Technic A has proved its ability in identifying missing values leading for the improvement of data completeness . technic B efferently caught and managed to treat the outliers paving for having more data consistency .Moreover , the application of different machine learning algorithms showed the variations in production and in models performance . with Decision Trees and Random Forest demonstrating strong accuracy values, while KNN excelled in precision and recall.
The finding highlight the significance of data cleaning technics in improving data quality and condition and in the performance of machine learning models in overall . the results also suggest that the choice of data cleaning technique and machine learning algorithm should determined based on the requirements and the objectives of the application .
Sensitivity Analysis
To ensure the findings were reliable, a sensitivity analysis was conducted by changing the parameters and alternative approaches to data cleaning and model training. The results showed consistent patterns, which supported the effectiveness of the chosen data cleaning techniques and the performance of the selected machine learning algorithms.
Limitations and Constraints
It is significant to admit the limitations and constrains of this study . the findings and the concluded results are based on the data cleaning technics and the machine learning algorithms used , and their generalization to include other datasets and algorithm may differ . Moreover the efficiency of the data cleaning technics may depend on the features , the quality and the conditions of the input data . Further study is required to find the influence of these factors in more detail.
Summary
This study present the findings , results and analysis taken from the apply of various data cleaning technics and the comparison of machine learning algorithms . the results marks and shows the effectiveness of certain technics in improving data quality and condition and the performance variations among different algorithms. The analysis and results indicates the strong relationship between data cleaning , data quality ,and machine learning model production .
conclusion
In conclusion, this study has provided insights into various aspects of machine learning, including data preprocessing, feature engineering, model selection, and performance evaluation. The findings and methodologies discussed can be utilized in practical applications, and future research can build upon this work by addressing the limitations and exploring more advanced techniques in machine learning.
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