A method of charting event occurrence counts includes processing event occurrence data recorded during operation of an industrial process to generate a chart having chart entries representing occurrence counts and chart positioning information. The chart positioning information includes an x-axis with a first time interval between x-positions and a y-axis with a second time interval between y-positions. Respective ones of the chart entries are positioned at intersections between the x-positions and y-positions by placing an element at the intersections having first feature attribute which indicates a relative magnitude of its event count. Time division count sums are computed to indicate a relative magnitude of a count sum across the x-positions and y-positions. The time division count sums are represented with a second feature attribute. The time division count sums are positioned for the x-positions adjacent to the second ending time and for the y-positions adjacent to the first ending time.