Results 61 to 70 of about 22,049,526 (145)

Air Quality Index Prediction in Six Major Chinese Urban Agglomerations: A Comparative Study of Single Machine Learning Model, Ensemble Model, and Hybrid Model

Atmosphere, 2023
Air pollution is a hotspot of wide concern in Chinese cities. With the worsening of air pollution, urban agglomerations face an increasingly complex environment for air quality monitoring, hindering sustainable and high-quality development in China. More
Binzhe Zhang, Min Duan, Yufan Sun, Yatong Lyu, Yali Hou, Tao Tan   +5 more
doaj   +1 more source

Model checking for parametric single‐index quantile models

Stat, 2020
In this work, we construct a lack‐of‐fit test for testing parametric single‐index quantile regression models. We apply the kernel smoothing technique for the multivariate nonparametric estimation involved in this task. To avoid the “curse of dimensionality” in multivariate nonparametric estimation and to fully utilize the information contained in the ...
Liangliang Yuan, Wenhui Liu, Xuemin Zi, Zhaojun Wang   +3 more
openaire   +2 more sources

Identifying crop phenology using maize height constructed from multi-sources images

International Journal of Applied Earth Observations and Geoinformation, 2022
In agriculture, crop height is an important indicator that is commonly applied for monitoring physiological-related traits such as above-ground biomass and grain yields.
Yahui Guo, Yi Xiao, MingWei Li, Fanghua Hao, Xuan Zhang, Hongyong Sun, Kirsten de Beurs, Yongshuo H. Fu, Yuhong He   +8 more
doaj   +1 more source

Portfolio Optimization of Stocks in Different Industries by Single-Index Model and Markowitz Model [PDF]

SHS Web of Conferences
In the financial sector, portfolio optimization is becoming more and more crucial. This article examines the portfolios of two industries, financial services and technology, in an effort to help prospective investors make decisions about their ...
Chen Mingrui
doaj   +1 more source

OPTIMAL PORTFOLIO FORMATION USING SINGLE INDEX MODEL

, 2023
The objective of this task was to create an optimal portfolio using shares from companies listed in the LQ-45 Index for the period between June 2020 and June 2022.
Ali, Muhammad, Setiyono, Nia Nanda Nugrayani, Nohong, Mursalim   +2 more
core  

Optimal Portfolio Analysis Using the Markowitz Model and Single Index Model on Jakarta Islamic Index (JII) Stocks: Historical Data 2022–2025

Indonesian Interdisciplinary Journal of Sharia Economics
This study analyzes and compares the construction of optimal Islamic stock portfolios using the Markowitz Model and the Single Index Model for stocks listed in the Jakarta Islamic Index (JII).
Cahaya Ningsih, Pipit Yunianingsih
doaj   +1 more source

Block Empirical Likelihood for Longitudinal Single-Index Varying-Coefficient Model

Journal of Applied Mathematics, 2013
In this paper, we consider a single-index varying-coefficient model with application to longitudinal data. In order to accommodate the within-group correlation, we apply the block empirical likelihood procedure to longitudinal single-index varying ...
Yunquan Song, Ling Jian, Lu Lin
doaj   +1 more source

Estimation of the mean of the partially linear single-index errors-in-variables model with missing response variables

Journal of Inequalities and Applications, 2020
In this paper, we estimate the mean of the partially linear single-index errors-in-variables model with missing response variables. The linear covariate is measured with additive error, therefore missing is not random.
Xin Qi, ZhuoXi Yu
doaj   +1 more source

THE SINGLE INDEX MARKET MODEL IN AGRICULTURE [PDF]

This study illustrates the differences in empirical results due to data measurements and estimating procedures when applying the single index market model in agriculture.
Tambe, A.M., Gempesaw, Conrado M., II, Nayga, Rodolfo M., Jr., Toensmeyer, Ulrich C.   +3 more
core  

Semiparametric Estimation of Single-Index Transition Intensities [PDF]

This research develops semiparametric kernel-based estimators of state-specific conditional transition intensities, h(y|x), for duration models with right-censoring and/or multiple destinations (competing risks).
Tue Gorgens
core   +2 more sources