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How are water quality indexes calculated? 

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Water quality indexes are calculated by integrating the values of multiple water parameters into a single value, which reflects the overall quality of water. Different methods and formulas are used to calculate water quality indexes, and these methods can vary from country to country. Some methods use three, six, or even more than six parameters to calculate the index. Traditional methods of calculating water quality indexes did not include microbial parameters, leading to the development of various new methods, including fuzzy logic-based approaches. Machine learning algorithms, such as Decision Tree (DT) classifier, Support Vector Machine (SVM), and Random Forest (RF) classifier, have also been applied to estimate water quality indexes. These algorithms handle large datasets effectively and efficiently, providing accurate predictions.

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The paper states that the Water Quality Index (WQI) was calculated using MATLAB and Simulink software based on formulas and standard values from the Bureau of Indian Standards.
The paper mentions that the water quality index (WQI) is calculated using the weighted arithmetic index method.
The paper does not provide information on how water quality indexes are calculated.
The paper provides formulae for different methods to calculate water quality indices, including methods that use three, six, or more parameters.
The paper does not provide information on how water quality indexes are calculated.

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