Quantitative relationship between grip strength and quality of life in the older adult based on a restricted cubic spline modeldoi:10.3389/fpubh.2024.1417660Fanhao MengYunqing ZhangChaoxing LiuCailiang ZhouFrontiers in Public Health
cubic splines是data interpolation的方法。精髓就是相邻点点(knots 是曲线必经点点的意思)之间都是三次方程（cubic polynomial ）. restricted cubic splines比cubic splines特殊的地方就是要求点点两边外侧是直线（linear)，中间是cubic splines，而且要自己，一次，二次微分都连续（continuous）。a spline wit...
which is already a major improvement, but has jumps (one of them fairly large) and sudden shifts in direction that are probably as hard to justify as the jumps in the earlier model. Next, we can force the lines to match up with a restricted linear spline. There is already an R ...
Two types of models were applied—a linear and nonlinear model with restricted cubic splines—to assess the U-shaped association. Statistical significance (set at 0.05) for the nonlinearity was tested by comparing the spline and linear models. Among the participants, 701 were certified as needing ...
In addition to randomization assignment, the primary outcome model included the following predictor variables: age (as a restricted cubic spline), sex, duration of symptoms prior to receipt of study drug, calendar time (as a restricted cubic spline), vaccination status, geographic region (Midwest,...
Restricted cubic splines are a way of testing the hypothesis thatthe relationship is not linear or summarizing a relationship that is too non-linear to be usefully summarized by a linear relationship. Restricted cubic splines are just a transformation of an independent variable.Thus, they can be ...
Paper 5621-2016 Restricted Cubic Spline Regression: A Brief Introduction Ruth Croxford, Institute for Clinical Evaluative Sciences ABSTRACT Sometimes, the relationship between an outcome (dependent) variable and the explanatory (independent) variable(s) is not linear. Restricted cubic splines are a way ...
(StataCorp. 2017, Stata Statistical Software: Release 15. College Station, TX: StataCorp LLC). To investigate whether the level of parasite density was influenced by any host factor, we ran a separate cubic spline mixed model fitted by restricted maximum likelihood, including parasite density as...
cubic spline model, denotedVR6, using the same idea as in ref.68. The baseline is described by a cubic spline fit that comprises the point (3.0 Å, 0 eV) together with the LJ potential between 4.0 and 20 Å, using spline points at 0.1-Å spacing up to 4.5 Å, and...
Sepsis is a life-threatening condition that significantly increases mortality in leukemia patients.1 Due to the immunosuppressed state of leukemia patients, they are particularly vulnerable to infe...