# Tagged Questions

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204 views

### Correct way to compare two (very) different regression models?

I'm working with some piecewise linear regression models, and I'd like to compare their predictions with those produced by multiple (weighted) linear regression models. Both models describe the same ...
205 views

### Piecewise linear regression with knots as parameters

I would like to fit a piecewise linear regression with knots as parameters. I would like to know what's the best solution. Should I run a set of regressions with all the possible knots and choosing ...
21 views

### Parametric segmented or piecewise regression with heteroscedastic errors

I am fitting longitudinal data with an increase in variance over time. The standard physiological model is a bi- or tri-linear model with variable breakpoints. The estimated parameters are used to ...
241 views

### Standard error of slopes in piecewise linear regression with known breakpoints

The situation I have a dataset with one dependent $y$ and one independent variable $x$. I want to fit a continuous piecewise linear regression with $k$ known/fixed breakpoints occurring at \$(a_{1}, ...
158 views

### How to find a breakpoint for each ID in a linear regression model with R?

I have some repeated measures with 196 individuals and some of my regressions have a plateau. So I want to characterize this with an eventual breakpoint for each ID. Example: subset of my personal ...
332 views

### Estimating two break points in a broken stick model with random effects in R

Five months ago, jbowman posted a very useful answer to estimate the break point in a broken stick model with random effects in R. I never use "computing" like ...
481 views

### How to determine if predictor in piece-wise linear regression is significant?

I saw a comment by mpiktas that "The sum of two independent t-distributed random variables is not t-distributed". Is it then of any known distribution? Actually, I am using piece-wise linear ...
249 views

### Bootstrap distribution of a breakpoint not centered around its parameter estimate

I estimated the breakpoint for a piecewise linear model (one intercept, two slopes that meet at the breakpoint) by minimizing the deviance using an optimizer (optim ...