Questions marquées «clustered-standard-errors»

27
Les degrés de liberté peuvent-ils être un nombre non entier?

Lorsque j'utilise GAM, cela me donne un DF résiduel de (dernière ligne du code). Qu'est-ce que ça veut dire? Au-delà de l'exemple GAM, en général, le nombre de degrés de liberté peut-il être un nombre non entier?26.626.626.6 > library(gam) > summary(gam(mpg~lo(wt),data=mtcars)) Call:...

r degrees-of-freedom gam machine-learning pca lasso probability self-study bootstrap expected-value regression machine-learning linear-model probability simulation random-generation machine-learning distributions svm libsvm classification pca multivariate-analysis feature-selection archaeology r regression dataset simulation r regression time-series forecasting predictive-models r mean sem lavaan machine-learning regularization regression conv-neural-network convolution classification deep-learning conv-neural-network regression categorical-data econometrics r confirmatory-factor scale-invariance self-study unbiased-estimator mse regression residuals sampling random-variable sample probability random-variable convergence r survival weibull references autocorrelation hypothesis-testing distributions correlation regression statistical-significance regression-coefficients univariate categorical-data chi-squared regression machine-learning multiple-regression categorical-data linear-model pca factor-analysis factor-rotation classification scikit-learn logistic p-value regression panel-data multilevel-analysis variance bootstrap bias probability r distributions interquartile time-series hypothesis-testing normal-distribution normality-assumption kurtosis arima panel-data stata clustered-standard-errors machine-learning optimization lasso multivariate-analysis ancova machine-learning cross-validation
15
La précision de la machine augmentant le gradient diminue à mesure que le nombre d'itérations augmente

J'expérimente l'algorithme de la machine de renforcement de gradient via le caretpackage en R. À l'aide d'un petit ensemble de données d'admission à l'université, j'ai exécuté le code suivant: library(caret) ### Load admissions dataset. ### mydata <-

machine-learning caret boosting gbm hypothesis-testing t-test panel-data psychometrics intraclass-correlation generalized-linear-model categorical-data binomial model intercept causality cross-correlation distributions ranks p-value z-test sign-test time-series references terminology cross-correlation definition probability distributions beta-distribution inverse-gamma missing-data paired-comparisons paired-data clustered-standard-errors cluster-sample time-series arima logistic binary-data odds-ratio medicine hypothesis-testing wilcoxon-mann-whitney unsupervised-learning hierarchical-clustering neural-networks train clustering k-means regression ordinal-data change-scores machine-learning experiment-design roc precision-recall auc stata multilevel-analysis regression fitting nonlinear jmp r data-visualization gam gamm4 r lme4-nlme many-categories regression causality instrumental-variables endogeneity controlling-for-a-variable