DanielT_LIS4370.Rprog

Daniel Tafmizi Dr. Friedman Lis 4370 Module 5 Github:  daniel.R/Work.R/LIS4370Rprog/Mod5.R at main · DanielDataGit/daniel.R (github.com) The provided matrices were singular and non-square. For linear systems, finding an inverse of these types requires a variation of Singular Value Decomposition (SVD), which essentially breaks down a matrix into three parts (the rows, the columns, and its diagonal "time/instance order"). R's matlib library provides the function ginv(), which uses the Moore-Penrose inverse to create a generalized inverse that is useful in solving linear systems. The formula is  A + = V D + U T, where V is an orthogonal row matrix, D+ is the transposed reciprocal of all non-zero values in the diagonal matrix, and UT is the transposed orthogonal column matrix. It is used to calculate an approximate solution to an "unsolvable" linear system. 

 Daniel Tafmizi Dr. Friedman Lis 4370 Module 4 Github:  daniel.R/Work.R/LIS4370Rprog/module4.R at main · DanielDataGit/daniel.R (github.com) Based on the boxplots, it seems there is a correlation between higher frequencies and blood pressure to immediate care. The histogram shows that people with less than 100 bp are more likely to see immediate care. 

Daniel Tafmizi Dr. Friedman Lis 4370 Module 3 Github:  daniel.R/Work.R/LIS4370Rprog/Mod3.R at main · DanielDataGit/daniel.R (github.com)

 Daniel Tafmizi Dr. Friedman Lis 4370 Module 2 GitHub:  daniel.R/Work.R/LIS4370Rprog/Module2.R at main · DanielDataGit/daniel.R (github.com) When run, the following error code is executed,  "e rror in myMean() : object 'assignment' not found". This error is caused because there is no variable defined as assignment. Furthermore, the variable somedata also lacks definition. To call a variable it must be initialized with a value.