# Questions tagged [nonlinear]

This tag is deprecated because it is too broad. Please find a more specific tag.

352 questions
Filter by
Sorted by
Tagged with
1 vote
14 views

### Nonlinearity of model using Sobol indices

I'm analyzing a computationally demanding numeric model where I want to show that nonlinearities play a certain role for my problem. I want to do this using Sobol sensitivity indices of first oder by ...
84 views

### How to estimate this specific logistic regression model which is not linear in its parameters?

A. Suppose I want to fit the regression $Y = f(\lambda X_1 + (1-\lambda) X_2)$ where $f(x) = ax^2 + bx + c$, and $\lambda$, a, b, c are to be estimated using the data. This is nonlinear, but it's ...
1 vote
58 views

### crossed random effects in nonlinear mixed-effects model

I am a beginner in mixed effects modeling and am trying to find some useful code to solve my current problem. Specifically, I'm having some problems with model fitting. I'm looking for a ...
1 vote
31 views

### Interpertation of a conditional quadratic latent growth curve model (i.e., with predictors)

I have a conditional quadratic latent growth curve model and am wondering how to interpret the results. My predictor of interest is significantly associated with the slope factor (B = -0.45, p = .001) ...
123 views

### How to calculate covariance matrix in nonlinear least squares

I am fitting a nonlinear model to observations by using least squares to estimated the model parameters. Theoretically, the covariance matrix of the parameters can be estimated by inverting the ...
1 vote
31 views

### Specifying continuous autoregressive covariance structure in multilevel daily diary model

I have a daily diary dataset with daily ratings of mood (e.g., daily rating of happiness) between two treatment conditions. The complete number of days of ratings vary widely across participants and ...
30 views

### How to deal with a few number of cluster (n<15) for nonlinear?

I am currently trying to address a few number of clusters (n<15) for a nonlinear model (multinomial logit). I have already gotten an idea from Cameron et al. (2008) for a linear model to use "...
1 vote
56 views

### Can All Regression Supervised Machine Learning Models Be Viewed as Linear Models Over Transformed Features?

I've been studying various supervised machine learning algorithms for regression tasks, and I've come across an interesting perspective suggesting all machine learning models could be represented as ...