The-Dream, the R&B singer and behind-the-scenes power player, recently boasted of a $15 million payday for writing Rihanna's 2007 smash Umbrella. True? When you have a cross-over song, it just makes more and more and more money, says Tom DeSavia, a vice president at Notable Music, a 50-year-old music publisher founded by the late songwriter Cy Coleman.
Simple guide to confusion matrix terminology. A confusion matrix is a table that is often used to describe the performance of a classification model (or classifier) on a set of test data for which the true values are known.The confusion matrix itself is relatively simple to understand, but the related terminology can be confusing. wanted to create a quick reference guide for confusion matrix terminology because I couldn't find an existing resource that suited my requirements: compact in presentation, using numbers instead of arbitrary variables, and explained both in terms of formulas and sentences.
Matrix. A matrix is a collection of data elements arranged in a two-dimensional rectangular layout. The following is an example of a matrix with 2 rows and 3 columns. We reproduce a memory representation of the matrix in R with the matrix function. The data elements must be of the same basic type. + c(2, 4, 3, 1, 5, 7), # the data elements. + nrow=2, # number of rows. + ncol=3, # number of columns. + byrow = TRUE) # fill matrix by rows. [,1] [,2] [,3]. [1,] 2 4 3. [2,] 1 5 7. An element at the m row, n column of A can be accessed by the expression A[m, n] .