R Fortunes: Collected Wisdom15 hours ago
No articles match
Econometric Computing with HC and HAC Covariance Matrix Estimators3 months ago
Constant Partying: Growing and Handling Trees with Constant Fits4 months ago
Classes and methods | Coercing tree objects | Growing a simple classification tree | Predictions | Conclusion
ctree: Conditional Inference Trees4 months ago
Overview | Introduction | Recursive binary partitioning | Recursive partitioning by conditional inference | Examples | Illustrations and applications | Backward compatibility and novel functionality
Parties, Models, Mobsters: A New Implementation of Model-Based Recursive Partitioning in R4 months ago
Overview | MOB: Model-based recursive partitioning | A new implementation in R | Illustrations | Setting up a new mobster | Conclusion
partykit: A Toolkit for Recursive Partytioning4 months ago
Overview | Motivating example | Technical details | Summary
zoo Design4 months ago
zoo FAQ4 months ago
1. I know that duplicate times are not allowed but my data has them. What do I do? | 2. When I try to specify a log axis to plot.zoo a warning is issued. What is wrong? | 3. How do I create right and a left vertical axes in plot.zoo? | 4. I have data frame with both numeric and factor columns. How do I convert that to a "zoo" object? | 5. Why does lag give slightly different results on a "zoo" and a "zooreg" series which are otherwise the same? | 6. How do I subtract the mean of each month from a "zoo" series? | 7. How do I create a monthly series but still keep track of the dates? | 8. How are axes added to a plot created using plot.zoo? | 9. Why is nothing plotted except axes when I plot an object with many NAs? | 10. Does zoo work with Rmetrics? | 11. What other packages use zoo? | 12. Why does ifelse not work as I expect? | 13. In a series which is regular except for a few missing times or for which we wish to align to a grid how is it filled in or aligned? | 14. What is the difference between as.Date in zoo and as.Date in the core of R? | 15. How can I speed up zoo?
Flexible Generation of E-Learning Exams in R: Moodle Quizzes, OLAT Assessments, and Beyond6 months ago
Beta Regression in R11 months ago
Introduction | Beta regression | Implementation in R | Beta regression in practice | The basic model: Estimation, inference, diagnostics | Prater's gasoline yield data | Household food expenditures | Variable dispersion model | Selection of different link functions | Further replication exercises | Dyslexia and IQ predicting reading accuracy | Structural change testing in beta regressions | Summary | Acknowledgments | References
Embedding R/exams Exercises as Forms in R/Markdown or Quarto Documents1 years ago
Overview | First examples | More elaborate examples | Building blocks | Demo files | Setup and customization | Standalone interaction forms
Reading Data in zoo1 years ago
zoo Quick Reference1 years ago
Read a series from a text file | Query dates | Convert back into a plain matrix | Union and intersection | Visualization | Select (a few) observations | Handle missing data | Prices and returns | Query Yahoo! Finance | Summaries
zoo: An S3 Class and Methods for Indexed Totally Ordered Observations1 years ago
Introduction | The class "zoo" and its methods | Combining zoo with other packages | Summary and outlook | Reference card
Heteroscedastic Censored and Truncated Regression with crch1 years ago
Introduction | Regression models | Censored regression (tobit) | Truncated regression | R implementation | Example | Summary | References
Heteroscedastic Censored and Truncated Regression with crch1 years ago
Introduction | Regression models | Censored regression (tobit) | Truncated regression | R implementation | Example | Summary | References
Extended Beta Regression in R: Shaken, Stirred, Mixed, and Partitioned1 years ago
Introduction | A brief review of beta regression | Implementation in R | Extensions | Bias correction and reduction in beta regressions | Preamble | Generic framework | Bias correction and bias reduction for beta regressions | Implementation in betareg | Beta regression trees | Finite mixtures of beta regressions | Illustrative application | Bias correction and reduction | Beta regression tree | Latent class beta regression | Conclusions | Acknowledgments | Appendix: Bias correction/reduction for gasoline yield data | References
Automatic Generation of Exams in R2 years ago
colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes2 years ago
Overview | Installation | Choosing HCL-based color palettes | Usage with base graphics | Usage with ggplot2 | Palette visualization and assessment
ivreg: Two-Stage Least-Squares Regression with Diagnostics2 years ago
Overview | Installation | Instrumental variables regression | Illustration: Returns to schooling
Regression Models for Count Data in R2 years ago
Introduction | Models and software | Application and illustrations | Summary | Technical details for hurdle models | Technical details for zero-inflated models | Methods for fitted zero-inflated and hurdle models | Replication of textbook results
Fitting Generalized Linear Mixed-Effects Model Trees3 years ago
Introduction | Fitting a mixed-model tree with constant fits | Detecting treatment-subgroup interactions in clustered data | Detecting subgroups with different growth trajectories | R code for generating artificial motivating dataset
Various Versatile Variances: An Object-Oriented Implementation of Clustered Covariances in R3 years ago
Diagnostics for 2SLS Regression3 years ago
Introduction | Review of 2SLS Estimation | Unusual-Data Diagnostics for 2SLS Regression | Unusual-Data Diagnostics in the ivreg Package | Unusual Data Diagnostics: An Example | Nonlinearity Diagnostics | Diagnosing Nonlinearity: An Example | Nonconstant Error Variance | Weighted 2SLS Regression | Collinearity Diagnostics | Robust Two-Stage Instrumental-Variables Regression | Concluding Remarks | References
Object-Oriented Computation of Sandwich Estimators4 years ago
Intro to hypothesis testing4 years ago
Things that can go wrong | False positives | False negatives | Examples | Z-test | Power for Z-test
One sample sign tests4 years ago
Problem setup | Null hypothesis and test statistic | Calculating p-values | Using the binom.test() function
One sample T-tests4 years ago
Problem setup | Assumption checking | Null hypothesis and test statistic | Calculating p-values | Using the t.test() function
One sample Z-tests4 years ago
Problem setup | Assumption checking | Null hypothesis and test statistic | Calculating p-values | Rejection regions | Power and sample size calculations | Formulas for power | Formulas for sample size calculations
One sample Z-tests for a proportion4 years ago
Problem setup | Assumption checking | Null hypothesis and test statistic | Calculating p-values | One-sided Z-tests
T confidence interval for a mean4 years ago
Using the t.test() function
Paired tests4 years ago
Problem setup | Working with the differences | Paired tests versus two sample tests | Paired Z-test | Paired T-test | Paired sign-test
The Poisson distribution: From basic probability theory to regression models4 years ago
The Poisson distribution | Goals in the 2018 FIFA World Cup | Basic fitted distribution | Poisson regression and probabilistic forecasting | Further details and extensions | Technical details: Maximum likelihood estimation of $\lambda$ | References
Two sample Z-tests4 years ago
Problem setup | Assumption checking | Null hypothesis and test statistic | Calculating p-values
Z confidence interval for a mean4 years ago
HCL-Based Color Palettes in R5 years ago
Introduction | Color palettes | Illustrations
Heteroscedastic Censored and Truncated Regression with crch7 years ago
Introduction | Circular regression models | Distribution trees for a von Mises distribution | Summary
Evolutionary Learning of Globally Optimal Classification and Regression Trees in R7 years ago
Introduction | Globally and locally optimal decision trees | The evtree algorithm | Implementation and application in practice | Performance comparison | Choice of evtree parameters | Conclusions
Countreg: Distributions8 years ago
Introduction | Implementation | Distributions | Poisson ("xpois") | Binomial ("xbinom") | Negative Binomial ("xnbinom") | Zero-Truncated Poisson ("xztpois") | Zero-Truncated Negative Binomial ("xztnbinom") | Hurdle Poisson ("xhpois") | Hurdle Negative Binomial ("xhnbinom")
