In this paper, stability in a polynomial model called a polynomial self-regression model with trigonometric boundaries was studied. A linear approximation technique was used, and the Box-Genghis method was used in data analysis, and time series modeling of numbers of people with media. Data were obtained from AL-Yarmouk Hospital in Baghdad AL-Karkh for the period (2011-2016) shows the numbers of patients with the disease through the technique of Linear approximation. Then we found the single point and the stability of the final cycle, and we tried to apply the results that we obtained on the correct data for audit.
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