Pertanyaan yang diberi tag linear-algebra

13
Paket GBM vs. Caret menggunakan GBM

Saya telah menggunakan model tuning caret, tetapi kemudian menjalankan kembali model menggunakan gbmpaket. Ini adalah pemahaman saya bahwa caretpaket menggunakan gbmdan hasilnya harus sama. Namun, hanya menjalankan tes cepat menggunakan data(iris)menunjukkan perbedaan dalam model sekitar 5%...

r caret gbm matrix linear-algebra logistic modeling logit ordered-logit r confidence-interval survival population weibull classification separation hypothesis-testing correlation statistical-significance p-value python r data-visualization r regression multiple-regression chi-squared multivariate-analysis distributions random-variable experiment-design distributions poisson-regression residuals excel time-series garch var survival modeling cox-model interaction r pca normality-assumption
10
Nilai variabel tersembunyi regresi linear R "bernilai"

Ini hanya contoh yang saya temui beberapa kali, jadi saya tidak punya data sampel. Menjalankan model regresi linier di R: a.lm = lm(Y ~ x1 + x2) x1adalah variabel kontinu. x2bersifat kategorikal dan memiliki tiga nilai, mis. "Rendah", "Sedang" dan "Tinggi". Namun output yang diberikan oleh R akan...

r regression categorical-data regression-coefficients categorical-encoding machine-learning random-forest anova spss r self-study bootstrap monte-carlo r multiple-regression partitioning neural-networks normalization machine-learning svm kernel-trick self-study survival cox-model repeated-measures survey likert correlation variance sampling meta-analysis anova independence sample assumptions bayesian covariance r regression time-series mathematical-statistics graphical-model machine-learning linear-model kernel-trick linear-algebra self-study moments function correlation spss probability confidence-interval sampling mean population r generalized-linear-model prediction offset data-visualization clustering sas cart binning sas logistic causality regression self-study standard-error r distributions r regression time-series multiple-regression python chi-squared independence sample clustering data-mining rapidminer probability stochastic-processes clustering binary-data dimensionality-reduction svd correspondence-analysis data-visualization excel c# hypothesis-testing econometrics survey rating composite regression least-squares mcmc markov-process kullback-leibler convergence predictive-models r regression anova confidence-interval survival cox-model hazard normal-distribution autoregressive mixed-model r mixed-model sas hypothesis-testing mediation interaction
9
Mengapa skor komponen utama tidak berkorelasi?

Anggaplah adalah matriks data yang berpusat pada rata-rata. Matriks S = cov ( A ) adalah m × m , memiliki m nilai eigen yang berbeda, dan vektor eigen s 1 , s 2 ... s m , yang ortogonal.SEBUAHSEBUAH\mathbf AS =cov( A )S=cov(SEBUAH)\mathbf S=\text{cov}(\mathbf A)m × mm×mm\times mmmms1s1\mathbf...

correlation pca linear-algebra
9
Bagaimana cara membandingkan acara yang diamati dengan yang diharapkan?

Misalkan saya punya satu sampel frekuensi dari 4 peristiwa yang mungkin: Event1 - 5 E2 - 1 E3 - 0 E4 - 12 dan saya memiliki probabilitas yang diharapkan dari peristiwa saya terjadi: p1 - 0.2 p2 - 0.1 p3 - 0.1 p4 - 0.6 Dengan jumlah frekuensi yang diamati dari empat acara saya (18) saya dapat...

r statistical-significance chi-squared multivariate-analysis exponential joint-distribution statistical-significance self-study standard-deviation probability normal-distribution spss interpretation assumptions cox-model reporting cox-model statistical-significance reliability method-comparison classification boosting ensemble adaboost confidence-interval cross-validation prediction prediction-interval regression machine-learning svm regularization regression sampling survey probit matlab feature-selection information-theory mutual-information time-series forecasting simulation classification boosting ensemble adaboost normal-distribution multivariate-analysis covariance gini clustering text-mining distance-functions information-retrieval similarities regression logistic stata group-differences r anova confidence-interval repeated-measures r logistic lme4-nlme inference fiducial kalman-filter classification discriminant-analysis linear-algebra computing statistical-significance time-series panel-data missing-data uncertainty probability multivariate-analysis r classification spss k-means discriminant-analysis poisson-distribution average r random-forest importance probability conditional-probability distributions standard-deviation time-series machine-learning online forecasting r pca dataset data-visualization bayes distributions mathematical-statistics degrees-of-freedom