The simplest form of analysing data is to form survey tabulations. This is done by counting the number (and percentage) of people that fall in to the predefined categories of our questionnaire. The basic tool for the survey analyst is the cross tabulation in which one or more questions on the questionnaire form the rows of the cross tabulation and one or more different items form the columns. The simplest form would be where one question forms the rows and one demographic forms the columns.
The authors are not in agreement as to the possibility of combining on one graph a correlation between two variables and the evolution of the former in time, in other words putting three variables on a plane graph. We shall not enter into the details of the question, and this modest contribution is only designed to make known our experience in this field and the satisfaction we have derived from this method. The method consists in establishing a relationship between two data on an international,, interdepartmental, inter-community level, etc., but instead, of being limited to a photograph of the respective positions of the spaces under consideration, a film is presented, in other words the notion of time for each country, department, community, etc. is introduced into the graph. These areas are no longer represented by a point, but by a line which interprets the evolutional tendency of a country and whose curve can thus be compared to that of the line of lessor squares.
The authors are not in agreement as to the possibility of combining on one graph a correlation between two variables and the evolution of the former in time, in other words putting three variables on a plane graph. We shall not enter into the details of the question, and this modest contribution is only designed to make known our experience in this field and the satisfaction we have derived from this method. The method consists in establishing a relationship between two data on an international,, interdepartmental, inter-community level, etc., but instead, of being limited to a photograph of the respective positions of the spaces under consideration, a film is presented, in other words the notion of time for each country, department, community, etc. is introduced into the graph. These areas are no longer represented by a point, but by a line which interprets the evolutional tendency of a country and whose curve can thus be compared to that of the line of lessor squares.