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Background Time series charts are increasingly used by clinical teams to monitor their performance, but statistical control charts are not widely used, partly due to uncertainty about which chart to ...

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Break-even can be calculated using the contribution method. This involves working out the contribution that each product sold provides towards the fixed costs of a business. Firstly, a business must ...

Correspondence to Atle Fretheim, Global Health Unit, Norwegian Knowledge Centre for the Health Services, P.O. Box 7004, St. Olavs, Oslo 0130, Norway; atle.fretheim{at}nokc.no Time series plots are ...