NLLS on Ned Charles's Websitehttps://nedcharles.com/tags/nlls/Recent content in NLLS on Ned Charles's WebsiteHugoen-usWed, 15 Apr 2020 08:00:00 -0600Using Python Multiprocessing with NLLS Regressionhttps://nedcharles.com/articles/using_python_multiprocessing_with_nlls_regression/Wed, 15 Apr 2020 08:00:00 -0600https://nedcharles.com/articles/using_python_multiprocessing_with_nlls_regression/A comparison of Nonlinear Least Squares Regression fitting on simulated data in Python, using the multiprocessing module versus a standard for loopNonlinear Least Squares Regression for Pythonhttps://nedcharles.com/articles/nonlinear_least_squares_regression_for_python/Tue, 25 Feb 2020 12:00:00 -0600https://nedcharles.com/articles/nonlinear_least_squares_regression_for_python/A walkthrough of some options for Nonlinear Least Squares Regression fitting in Python, including SciPy’s curve_fit and least_squares, along with the module LMFitPart 4: Model Selectionhttps://nedcharles.com/articles/model_selection/Sun, 17 Sep 2017 12:00:00 -0600https://nedcharles.com/articles/model_selection/This post investigates some common model selection methods, and does a detailed analysis of Akaike’s Information Criterion (AIC) and how it performs on some diffusion MRI models.Part 3: Bootstrap, Graphical Analysis, and Kurtosis Modelhttps://nedcharles.com/articles/bootstrap_kurtosis/Sun, 13 Aug 2017 12:00:00 -0600https://nedcharles.com/articles/bootstrap_kurtosis/This post looks at the statistical bootstrap as a method to diagnose ill-conditioning, graphical analysis of regression fitting, and examines the kurtosis Diffusion MRI model.Part 2: The Biexponential Model and Ill-Conditioninghttps://nedcharles.com/articles/biexponential_model/Sun, 30 Jul 2017 12:00:00 -0600https://nedcharles.com/articles/biexponential_model/An investigation on the biexponential model used with diffusion MRI and how it can exhibit large uncertainty in its parameter estimatesPart 1: My PhD Thesis Introductionhttps://nedcharles.com/articles/thesis_intro/Sun, 28 May 2017 12:00:00 -0600https://nedcharles.com/articles/thesis_intro/A blog post about the statistical modelling work I did during my PhDNonlinear Regression Primer using MATLABhttps://nedcharles.com/articles/nonlinear_regression/Mon, 05 Sep 2016 06:00:00 -0600https://nedcharles.com/articles/nonlinear_regression/A primer on how to use Nonlinear Regression with MATLAB