With subjects associated incomes and expenses, with some of them can only have incomes, other can only have costs. The application allows, for example, any expenditure which let's call invoice, to connect to the date, amount of money, category with which to associate consumption and short descriptive text (name of the invoice).
This data is stored and on their basis to draw up a reports (summary data) for a defined period by category. The categories are generalization of costs, such as object car - petrol category; - category oils; - category of tires and others.
The application facilitates the user when entering data as categories are chosen from pre-established dynamic list, the same applies when forming the name of the invoice ,date also elected by the calendar.
The revenue and expenditure considered as random variables form a stochastic process as for individual categories and for all categories. The app has features to calculate the autocorrelation for detection of internal cycles related revenues and expenses also apply forecasting methods