1. A system comprising: a measuring device comprising sensors configured to collect data from a user based on the sensors being at least one of in contact with and proximate to a section of skin of the user; a stress feature analyzer configured to determine a cardiovascular activity feature of the user, a skin conductance feature of the user, movement of the user, and skin temperature of the user based on the data collected with the measuring device; and a stress classifier configured to classify and report stress experienced by the user based on at least one of one feature selected from the cardiovascular activity feature and the skin conductance feature, and two features including a combination of the cardiovascular activity feature and the skin conductance feature, the stress classifier includes: a first stress classifier to classify the stress experienced by the user based on the one feature being the cardiovascular activity feature for a minute time interval when skin conductance data is missing during the minute time interval: a second stress classifier to classify the stress experienced by the user based on the one feature being the skin conductance feature for the minute time interval when cardiovascular activity data is missing; and a third stress classifier to classify the stress experienced by the user based on the two features including the combination of the cardiovascular activity feature and the skin conductance feature during the minute time interval when both the cardiovascular activity data and the skin conductance data are available; wherein when at least one of the skin temperature and movement of the user exceeds a defined threshold, the first, the second and third stress classifiers cease classify the stress experienced by the user.