Alex W

Alex W has asked 12 questions and find answers to 22 problems.

Stats

About

By day: Data Scientist working primarily in R and flavors of SQL

EDU: MS in Statistics from UCLA. My thesis can be found here

Alex W questions

Is there a `data.table` representation of sparse matrices / objects?
casting error - Error in .subset2(x, i, exact = exact)
caret - random-forests not working: "Something is wrong; all the Accuracy metric values are missing:"
Error in eval(expr, envir, enclos) - contradiction?
Rcpp NumericMatrix - how to erase a row / column?
rgdal / readOGR - unable to read shapefile from .zip
Shiny ui.R - Error in tag("div", list(...)) - not sure where error is

Alex W answers

Understanding output of 'predict' in R
how to add text in my boxplot? [duplicate]
Multivariate Linear Mixed Model in lme4
Reproduce a 'The Economist' chart with dual axis
Multiple Logistic Regression with Interaction between Quantitative and Qualitative Explanatory Variables
R: Plotting panel model predictions using plm & pglm
add exact proportion of random missing values to data.frame
ANOVA with block design and repeated measures
Fitting the same models in nlme and lme4
Rcpp NumericMatrix - how to erase a row / column?