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Of course , that 's easy to say , but hard to accomplish unless everyone involved knows what the relevant data is , and how presentation methods would affect understanding of the data . At first glance , a new screening method for cardiovascular disease seemed like a major advance.According to a study published last month in The New England Journal of Medicine , healthy adults who flunked a panel of 10 heart-related lab tests were four times likelier to die over a period of about 7 1/2 years than patients with good scores , even after controlling for factors already linked to heart disease like high cholesterol.But surprisingly , the researchers - - most of whom are based in Boston - - concluded that their screening method would n't be very good at predicting heart problems in healthy patients.The trouble , said James Ware , a statistician with the New England Journal who wrote an accompanying editorial , is that it 's much easier to identify patterns among a group of people than it is to predict risk in individuals.The study serves as a cautionary tale to many other scientists and companies attempting to develop new screening tests using so-called biomarkers - - substances in the blood or urine linked to diseases like cancer and heart attacks . If true , this would mean the more economical ( in terms of time and equipment ) and convenient ( no need to find a suitable reference site ) H / V method would be sufficient in characterizing the site effect at rock sites . Rather , as Respondent contends , the provision was intended to transfer to bargaining unit members the discretion to determine which teaching methods would be used to teach a prescribed curriculum . Additional court cases and informal IRS statements seem to indicate that , when the cost of purchases is 8 % or less of total receipts , the cash method would be allowed in certain entities .