Naive B or B+ trees are very good and efficient for indexing single dimensional data but not well suited for multidimensional data. Antonin Guttman of University of California, Berkeley proposed a novel scheme for indexing multidimensional data called R Trees. Since then several variants of the R tree have been developed for for different situations and work loads. R tree and its variants have ...

A. Two quite different forms of nonlinear principal component analysis have been proposed in the literature. The first one is associated with the names of Guttman, Burt, Hayashi, Benzécri, McDonald, De Leeuw, Hill, Nishisato. We call itmultiple correspondence analysis. The second form has been discussed by Kruskal, Shepard, Roskam, Takane, Young, De Leeuw, Winsberg, Ramsay. We call it no...

DEVRIES, RHETA. Relationships among Piagetian, lQ, and Achievement Assessments. CHILD DEVELOPMENT, 1974, 45, 746-756. Empirical relationships are explored among the theoretically different Piagetian and psychometric assessments of intelligence, and school achievement. Ss were 143 bright and average children chronologically aged 5, 6, and 7 years. Factor analyses of perfoniiance on the Californi...

Current methods of ranking or scoring disability tend to be arbitrary. A new method is put forward on the hypothesis that disability progresses in regular, cumulative patterns. A model of disability is defined and tested with the use of Guttman scale analysis. Its validity is indicated on data from a survey in the community and from postsurgical patients, and some factors involved in scale vari...

Available online 9 August 2008 Several E-Government website usability studies in the United States employ content analysis as their research methodology. They use either dichotomous measures or a generic scale to construct indexes to conduct comparative reviews. Building on those studies, this article suggests a content-analysis methodology utilizing Guttman-type scales wherever possible to ref...

Introduction: The current study aims to measure the validity, reliability, and psychometric properties of the Persian translation of the Video Gaming Addiction Test (VAT). Materials and Methods: A total of 280 young men (14-20 years old) (mean ± SD age: 17.22 ± 1.8 years), including excessive gamers and normal subjects, entered the study. They answered VAT, Visual Analog Scale (VAS), and Conne...

Impressive progress has been made in global surgery in the past 10 years, and now serious and evidence-based national strategies are being developed for scaling-up surgical services in sub-Saharan Africa. Key to achieving this goal requires developing a realistic country-based estimate of burden of surgical disease, developing an accurate estimate of existing need, deve...

Tujuan penelitian ini adalah untuk mendeskripsikan kesiapan siswa dalam pembelajaran online pada kelas VII di Simpang Tiga Laebingke Kecamatan Sirandorung. Pendekatan menggunakan deskriptif kualitatif. Triangulasi digunakan memeriksa keabsahan data dengan angket (skala Guttman), observasi, dan wawancara (untuk guru Matematika) pengumpulan data. Hasil menunjukkan 1) berdasarkan rata-rata belajar...

In this paper we start with Meyer-Ter-Vehn isobaric fusion model and try to reconstruct all equations by introducing a dimensionless variable ?i=ri/Rm. Then we investigate the proper sets of spark confinement parameter and temperature {Hs,Ts} which satisfy ignition conditions of spark ignition in deuterium-tritium (DT) equimolar mixture in terms of isentrope parameter, ?, implosion velocity, Ui...