title: [The analysis of threshold effect using Empower Stats software].
abstract: In many studies about biomedical research factors influence on the outcome variable, it has no influence or has a positive effect within a certain range. Exceeding a certain threshold value, the size of the effect and/or orientation will change, which called threshold effect. Whether there are threshold effects in the analysis of factors (x) on the outcome variable (y), it can be observed through a smooth curve fitting to see whether there is a piecewise linear relationship. And then using segmented regression model, LRT test and Bootstrap resampling method to analyze the threshold effect. Empower Stats software developed by American X & Y Solutions Inc has a threshold effect analysis module. You can input the threshold value at a given threshold segmentation simulated data. You may not input the threshold, but determined the optimal threshold analog data by the software automatically, and calculated the threshold confidence intervals.
authors: Department of Epidemiology, School of Binzhou Medical College, Yantai 264003, China.
authors: Lin
authors: L
authors: Lin
authors: Dana-Farber Cancer Institute, Harvard Medical School, Boston, USA;
authors: Chang-zhong
authors: CZ
authors: Chen
authors: Shanghai Key Laboratory of Children's Environmental Health,Xinhua Hospital Affiliated to School of Medicine, Shanghai Jiaotong University. Email: xdyu1108@163.com.
authors: Xiao-dan
authors: XD
authors: Yu
mesh_terms: D016001:Confidence Intervals; D004812:Epidemiologic Methods; D012984:Software