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A comparative analysis of methods for pruning decision trees 总被引:14,自引:0,他引:14
Esposito F. Malerba D. Semeraro G. Kay J. 《IEEE transactions on pattern analysis and machine intelligence》1997,19(5):476-491
In this paper, we address the problem of retrospectively pruning decision trees induced from data, according to a top-down approach. This problem has received considerable attention in the areas of pattern recognition and machine learning, and many distinct methods have been proposed in literature. We make a comparative study of six well-known pruning methods with the aim of understanding their theoretical foundations, their computational complexity, and the strengths and weaknesses of their formulation. Comments on the characteristics of each method are empirically supported. In particular, a wide experimentation performed on several data sets leads us to opposite conclusions on the predictive accuracy of simplified trees from some drawn in the literature. We attribute this divergence to differences in experimental designs. Finally, we prove and make use of a property of the reduced error pruning method to obtain an objective evaluation of the tendency to overprune/underprune observed in each method 相似文献
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Abdominal aortic dissection is a rare pathology. As far as we are concerned, only 59 cases have been reported in the English literature. In the last two years, two cases were treated at our Institution. Both were males, over 70 years of age. They were evaluated with ultrasonography, angiography (1 case) and Magnetic Resonance Imaging which showed localised dissection of the abdominal aorta with aneurysmal dilatation. They underwent surgical treatment with good results. At 1 and 2 years from operation both patients are alive and well. A postoperative ultrasonography didn't show any residual dissection. 相似文献
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S. Rombetto Yu. N. Ovchinnikov V. Corato P. Silvestrini E. Esposito C. Granata M. Russo R. Russo B. Ruggiero 《Open Systems & Information Dynamics》2007,14(2):209-216
We study the resonant quantum behaviour of a macroscopic superconducting system interacting with an external field. First
we consider the resonant tunneling assisted by microwave frequency in the moderate underdamped quantum regime. Then we consider
the resonant process in the extreme underdamped limit. In both regimes we have investigated a small frequency range, where
resonant phenomena take place. The transition probability W from the left to the right potential well has been numerically
calculated for an rf-SQUID as function of the external flux φ
x
for both regimes. Results indicate that, in a proper frequency and φ
x
range, the transition probability W can present two or three resonant peaks, depending on the damping regime. 相似文献
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Variant liver estrogen receptor transcripts already occur at an early stage of chronic liver disease
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Gennaro?Della?Vecchia Luigi?GalloEmail author Massimo?Esposito Antonio?Coronato 《Multimedia Tools and Applications》2012,59(1):341-362
In healthcare facilities most of the daily activities require strict coordination between clinicians, who often operate under
heavy workloads and minimal workforce conditions in environments filled with increasingly complex technology. Ubiquitous Computing
applications constitute a suitable solution for both reducing medical costs and improving patient safety by better supporting
clinical processes. In this study we introduce an intelligent infrastructure for smart hospitals which implements basic services
to optimize medical staff/patient interactions and grants ubiquitous and transparent access to clinical data stored in standard
clinical databases. This infrastructure relies on the integration of Radio Frequency IDentification (RFID) and photosensor
technologies to identify, locate and track clinicians and patients equipped with mobile devices and wearable RFID tags. 相似文献