Abstract
Many online community question answering sites have a user registration function. By using the information entered by the user, it becomes possible for the user to provide the information contents he / she desires, and it is possible to lead the user to use the service for a long time by functions for improving their satisfaction. In addition, it is possible to maximize revenue of services by delivering personaliz ed advertisements. Information on important events (life events) occurring in a person's lifetime, particularly marriage or childbirth, is known as the time when the person collects various information to make decisions and tend to carry out purchase activ ities of high unit price. However, there are certain barriers for the user to input such life event information, and there are cases in which some users do not input their own perso nal information There are users who use the service without inputting esti mated date of confinement even at Mamari which is a community question answering site for women who solves the question of pregnancy, childbirth, and child rearing Therefore, w e constructed a system that predicts user's baby’s estimated date of confinemen t by machine learning from the question posted by the user without inputting estimated date of confinement.
