نتایج جستجو برای: sites regression model
تعداد نتایج: 2559336 فیلتر نتایج به سال:
A coupled Bayesian model selection and geostatistical regression modeling approach is adopted for empirical analysis of gross primary productivity (GPP) at six AmeriFlux sites, including the Kennedy Space Center Scrub Oak, Vaira Ranch, Tonzi Ranch, Blodgett Forest, Morgan Monroe State Forest, and Harvard Forest sites. The analysis is performed at a continuum of temporal scales ranging from dail...
Soil quality, aggregate stability and erosion sensibility are affected by different range management practices. This research aimed to evaluate the relationships between soil organic carbon, mean weight diameter (MWD) and aggregate size distribution in the surface soil layer (0- 20 cm) of various range sites with different grazing intensities (non, slightly and heavily grazed) in Bardasiab ra...
We propose a two component graphical chain model, the discrete regression distribution, in which a set of categorical (or discrete) random variables is modeled as a response to a set of categorical and continuous covariates. We examine necessary and sufficient conditions for a discrete regression distribution to be described by a given graph. The discrete regression formulation is extended to a...
Due to its excellent toughness and stiffness in cryogenic conditions, 9% nickel steel is applied LNG storage facilities, usage increasing as a result of changes environmental regulations. A study was conducted on the development predictive model optimize laser welding process steel, two prediction models were developed using one hundred data points obtained through experiments. global regressio...
The haplotype inference is one of the most important issues in the field of bioinformatics. It is because of its various applications in the diagnosis and treatment of inherited diseases such as diabetes, Alzheimer's and heart disease, which has provided a competition for researchers in presentation of mathematical models and design of algorithms to solve this problem. Despite the existence of ...
In regression analysis, non-linearity in fixed and random effects can adversely affect efficiency of regression parameter estimates. Successful non-linear time series modeling would improve regression parameter estimates and produce a richer notion of water quality than linear time series models allow. In addition multiple independent variables make each point in space a finite dimensional vect...
Identification of cis-regulatory motifs has been difficult due to the short and variable length of the sequences that bind transcription factors. Using both sequence and microarray expression data, we present a method for identifying cis-regulatory motifs that uses regression trees to refine results from simple linear regression of expression levels on motif counts. Analysis of expression patte...
Despite recent development in producing chemical medicines, associated side effects have led to increased use of medicinal plants and natural compounds. Soil salinity, especially in arid and semi-arid regions, is a serious threat to global agriculture. Nowadays, efforts have been made to find benchmarks that can effectively select salt-tolerant or salt-resistant genotypes. In this regard, the u...
مقدمه: بارداری های ناخواسته و عوارض ناشی از آن، از مهمترین مشکلات مادران در جهان می باشد. مطالعه حاضر با هدف تعیین فاکتورهای موثر بر حاملگی ناخواسته در شهرستان شاهرود انجام شد. روش کار: این مطاله به روش مورد- شاهدی انجام گرفت در این مطالعه موردها 116 و 251 نفر کنترل طی سال 91 به صورت تصادفی انتخاب شده و اطلاعات آنها با استفاده از فرم جمع آوری داده ها شامل پرسشنامه خود ساخته که اعتبار و اعتماد ...
over the past decades a number of approaches have been applied for forecasting mortality. in 1992, a new method for long-run forecast of the level and age pattern of mortality was published by lee and carter. this method was welcomed by many authors so it was extended through a wider class of generalized, parametric and nonlinear model. this model represents one of the most influential recent d...
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