Improving the Accuracy of C4.5 Algorithm with Chi-Square Method on Pure Tea Classification Using Electronic Nose

Mula Agung Barata; Edi Noersasongko; Purwanto; Moch Arief Soeleman

doi:10.29207/resti.v7i2.4687

Mula Agung Barata Universitas Dian Nuswantoro
Edi Noersasongko Universitas Dian Nuswantoro
Purwanto Universitas Dian Nuswantoro
Moch Arief Soeleman Universitas Dian Nuswantoro

DOI: https://doi.org/10.29207/resti.v7i2.4687

Keywords: Electronic Nose, E-nose, C4.5 Algorithm, Chi-Square, Tea Plantation Commodities, Pure Indonesian Tea.

Abstract

Tea is one of the plantation products within the Ministry of Agriculture of the Republic of Indonesia, which plays an essential role as a mainstay commodity that boosts the Indonesian economy. Each type of tea has different properties, and the aroma of each type of tea can measure the quality of the tea. The human sense of smell is still very limited in classifying pure types of tea. Therefore, a device is needed to help measure the aroma of tea from an electronic nose. The devices attached to several gas sensors help humans take data from the smell of pure tea and calculate the value of each type of tea to test datasets with data mining algorithms. This study uses the C4.5 algorithm as a classification method with advantages over noise data, missing values, and handling variables with discrete and continuous types. Meanwhile, Chi-square is used to perform attribute severing in the data preprocessing process to increase the accuracy of dataset testing. Testing a pure tea dataset with four whole attributes, namely CO₂, CO, H₂, and CH₄, using the C4.5 algorithm resulted in an accuracy of 93.65% and an increase in the accuracy performance of the C4.5 algorithm by 94.27% with dataset testing using Chi-Square feature selection with the two highest value attributes.

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