Today's Newsday (3.10.2010) gives a summary of high school graduation rates in Nassau and Suffolk counties. The NYS Education Department has released these figures and more in the pdf file linked here.
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The "2005 cohort" is those students who began ninth grade in 2004-5 and ordinarily would have graduated by August 2009 after four years of high school. I have not yet found an explanation of how transfers-out and transfers-in are counted, and whether the cohort includes the same students at the start and at the finish. Not in Newsday but rather in the file linked above is the size of the 2005 cohort. Seaford's 2005 cohort is 226 students, 92% of whom graduated by August, 2009. Wantagh's numbers are 264 students and 98%. Massapequa: 624 and 96%. Plainedge: 283 and 95%. Bellmore-Merrick: 983 and 95%. Island Trees: 222 and 91%. Levittown: 658 and 94%.
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I have not located NY State figures for non-public schools, where again I feel that the size of the beginning cohort and the transfers are important information.
