نتایج جستجو برای: compositional data
تعداد نتایج: 2424312 فیلتر نتایج به سال:
BACKGROUND Daily activity data are by nature compositional data. Accordingly, they occupy a specific geometry with unique properties that is different to standard Euclidean geometry. This study aimed to estimate the difference in adiposity associated with isotemporal reallocation between daily activity behaviours, and to compare the findings from compositional isotemporal subsitution to those o...
It is now widely recognized that geochemical survey data are compositional in nature, with each component having relative importance as part of a whole. Compositional analysis (CoDA) based on log-ratio transformations can be used to deal the ‘sum one’ constraint. This study explored use two data-driven CoDA approaches, centered (clr)-biplot and compositional-balance approach, investigate associ...
We have obtained compositional data by INAA for several poorly characterized lunar-meteorite stones from hot deserts. Most are FLMs (feldspathic lunar meteorites). Our goal is to use compositional data to address whether any of the stones are paired with others that are better characterized. Dar al Gani 996. DaG 996 is a 12-g FLM stone. We analyzed 9 subsamples totaling 234 mg. Our sample had v...
New imputation algorithms for estimating missing values in compositional data are introduced. A first proposal uses the k-nearest neighbor procedure based on the Aitchison distance, a distance measure especially designed for compositional data. It is important to adjust the estimated missing values to the overall size of the compositional parts of the neighbors. As a second proposal an iterativ...
The chance-based compositional techniques utilized by composer John Cage in such works as “String Quartet in Four Parts” and “Music of Changes” made use of a compositional framework of gamuts and gamut squares that serves as the object-model for a compositional software application capable of transforming musical data cells using both chance-based and probabilitydriven functions. Written in Jav...
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