1) to analyse the different commodity groups, a control chart was developed for each bacterium tested and for all the bacteria combined,
2) the control chart time intervals are in units of months,
3) the statistical parameter used to approximate the mean is the proportion (i.e., the overall percentage of positive results) since
the analysis is a categorical data analysis,
4) the purpose of the control chart is to identify periods where the
percentage of positive results falls above the upper control limit(UCL); therefore, the center line and the lower control limit are
not shown, and
5) an upper control limit, plotted at two standard deviations from
the center line, has been added; as a result, two upper control limits are calculated, providing greater flexibility in decision- making.
1) to analyse the different commodity groups, a control chart was developed for each bacterium tested and for all the bacteria combined,2) the control chart time intervals are in units of months,3) the statistical parameter used to approximate the mean is the proportion (i.e., the overall percentage of positive results) sincethe analysis is a categorical data analysis,4) the purpose of the control chart is to identify periods where thepercentage of positive results falls above the upper control limit(UCL); therefore, the center line and the lower control limit arenot shown, and5) an upper control limit, plotted at two standard deviations fromthe center line, has been added; as a result, two upper control limits are calculated, providing greater flexibility in decision- making.
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