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This was reflected by the higher overall correct classification rate at the three examined decision criteria (see Table 3).
A Random Forest classifier uses a number of decision trees, in order to improve the classification rate.
New Brunswick has a classification rate of about 14 percent, he said, and spends about a third of its budget on special education.
Sensitivity, specificity, positive and negative predictive values and overall correct classification rate were calculated.
Simulations comparing the results of different growth models using the same data show that projection models have the highest correct classification rates for future proficiency: over 80 percent.
New Jersey has the highest classification rate in the nation for speech-impaired students, and the fourth-highest rate for those with "perceptual impairment," or mild learning disabilities.
"We will feel this more intensely, since the children are more needy for a number of reasons," said Mr. Heckelman, whose district has a classification rate of 19 percent.
But school superintendents and special-education teachers fiercely defend their classification rates, saying recent enrollment booms and an ever-growing number of children from troubled backgrounds make special education more necessary than ever.
The overall correct classification rate was highest for MPM II 0 and lowest for SAPS II at the different cutoff points; MPM II 24 and APACHE II had intermediate rates.
"When New Jersey is cited for its high classification rate, it is because New Jersey has made money available to provide comprehensive services," said Steven Krapes, director of the Forum School, a private school in Waldwick, Bergen County, for children with developmental disabilities.
