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On the average house-price-to-income ratios measure , the South West was marginally less affordable than London . Finally , in most industrial countries , and many emerging market economies as well , housing prices have risen to record levels , as have the ratios of house prices to rents . The integrated net peak intensities of one peak from each element detected were summed , and the individual peaks detected were ratioed to the sum . relatively thin capital ratios leave little room for error . The CHEMTAX determines the identities of each species in the sample by the ratios . Partners / Service spending ratio is 2.5 to 1 ; 20 % of all staff work done is by unpaid volunteers ; more than 230 community-based organizations exist to support goals of the NWRS . He pointed out that the ratio of students to support staff is 1:200 at public and private research universities , 1:350 at public four-year institutions , and even higher at community colleges . We test the dependence of the collision outcomes on impact parameter and speed , impactor spin , mass ratio , and coefficient of restitution . Ratios : The total and free testosterone / cortisol ratios were significantly higher during the resting session and the run compared to the resistance exercise . This member also stated that the ratio of the amount of monetary base in Japan to that in the United States seemed to be affecting the foreign exchange market .