Devices, systems, and methods for data analysis and diagnostics utilizing Dynamic Word Entropy. A method includes: obtaining a text of a user； determining word entropy values which correspond to different lengths of text-portions of the text of the user； generating a Dynamic Word Entropy table which corresponds to the text of the user； analyzing the table, and determining whether or not the user has a particular medical condition, or determining whether or not a particular intervention has positively affected the user or has negatively affected the user or has not affected the user.
