Classification analysis using decision tree on factors that influence the selection of contraception equipment in East Java Province

According to World Meters, Indonesia's population growth in 2021 is the 4th largest in the world. This shows that Indonesia still has problems with population growth rates that need to be controlled. The results of the 2020 population census show that Indonesia has a population growth of 35.56 million people compared to the 2010 population census. Efforts must be made, one of which is strengthening family planning programs. Unfortunately, this effort is currently experiencing obstacles due to the Covid-19 pandemic which eliminates physical gatherings. So that there is a need for renewable innovations, especially in the promotion of family planning programs. The use of Decision Trees makes it easier for BKKBN to analyze the classification of information sources and other demographic variables to find the most optimal, effective, and efficient model. The data used is the 2017 IDHS with the independent variable being the choice of contraceptive method and the dependent variable being the age of women, urban/rural, several children, family planning decision-makers, radio, television, newspapers/magazines, posters, banners, and the internet. The results show that the Method Information Index has the highest influence on the selection of contraceptives, then the variables of domicile, place of residence, and ownership of children. The decision tree model formed has an accuracy value of 88.99%, which means it is strong enough to predict the model in the population. The BKKBN needs to re-brand and re-focus on couples of childbearing age to increase access to information, especially for couples of childbearing age who have more than 3 children.