Questions marquées «theory»

8
Comment effectuer une SVD pour imputer des valeurs manquantes, un exemple concret

J'ai lu les excellents commentaires sur la façon de traiter les valeurs manquantes avant d'appliquer SVD, mais j'aimerais savoir comment cela fonctionne avec un exemple simple: Movie1 Movie2 Movie3 User1 5 4 User2 2 5 5 User3 3 4 User4 1 5 User5 5 1 5 Étant donné la matrice ci-dessus, si je...

r missing-data data-imputation svd sampling matlab mcmc importance-sampling predictive-models prediction algorithms graphical-model graph-theory r regression regression-coefficients r-squared r regression modeling confounding residuals fitting glmm zero-inflation overdispersion optimization curve-fitting regression time-series order-statistics bayesian prior uninformative-prior probability discrete-data kolmogorov-smirnov r data-visualization histogram dimensionality-reduction classification clustering accuracy semi-supervised labeling state-space-models t-test biostatistics paired-comparisons paired-data bioinformatics regression logistic multiple-regression mixed-model random-effects-model neural-networks error-propagation numerical-integration time-series missing-data data-imputation probability self-study combinatorics survival cox-model statistical-significance wilcoxon-mann-whitney hypothesis-testing distributions normal-distribution variance t-distribution probability simulation random-walk diffusion hypothesis-testing z-test hypothesis-testing data-transformation lognormal r regression agreement-statistics classification svm mixed-model non-independent observational-study goodness-of-fit residuals confirmatory-factor neural-networks deep-learning