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Based on small differences between the two methods of estimating the time of observation bias , the simpler categorical procedure was used for all climate divisions . The values in this file may not agree with statewide , regional , and national values published in other NCDC publications due to : ( 1 ) differences in the way the regions are defined , ( 2 ) the temperature data are adjusted for time of observation bias , and ( 3 ) the most recent months are based on preliminary data . K-8 licensure includes clock hours of observation participation , clock hours of clinical laboratory experiences , and a semester-long program of supervised student teaching at grades K-4 and 5-8 . K-8 and 1-8 licensure includes clock hours of observation participation , clock hours of clinical laboratory experiences , and a semester long program of supervised student teaching at grades K-4 and 5-8 . And an " objective reality " that exists independent of observation cannot , in principle - - indeed , cannot by definition - - be observed . The output from the model was the time of observation bias , with respect to a midnight-to - midnight climatological day , for each of the possible ending hours of the climatological day .