Publications by Bret Tobar
HW6
PART ONE 1 Theory of survival analysis A clinical trial is intended to test a new treatment for malignant melanoma vs.Ā current standard of care. The main outcome is disease-free survival. Each patient has a time š” in days after start of therapy that either represents the time of recurrence or death (if status = 1) or the end of the study (...
14095 sym R (17959 sym/71 pcs) 11 img 1 tbl
Tobar_Bret_HW1_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) library(knitr) library(kableExtra) 1. An economist compiled data on productivity improvements last year for a sample of firms producing electronic computing equipment. The firms were classified according to the level of their...
7767 sym R (157 sym/2 pcs)
Tobar_Bret_HW3_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) Case Study. Productivity improvement. An economist compiled data on productivity improvements last year for a sample of firms producing electronic computing equipment. The firms were classified according to the level of their ...
7443 sym R (7123 sym/57 pcs) 1 tbl
Tobar_Bret_HW6_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) Case Study. Brainstorming. A researcher investigated whether brainstorming is more effective for larger groups than for smaller ones by setting up four groups of agribusiness executives, the group sizes being two, three, four,...
6449 sym R (4943 sym/35 pcs) 1 img 1 tbl
Tobar_Bret_HW5_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) Case Study. Disk drive service. The staff of a service center for electronic equipment includes three technicians who specialize in repairing three widely used makes of disk drives for desktop computers. It was desired to stud...
8821 sym R (10799 sym/64 pcs) 1 img 5 tbl
Tobar_Bret_HW4_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) Case Study. Winding speeds. In a completely randomized design to study the effect of the speed of winding thread (1: slow; 2: normal; 3: fast; 4: maximum) onto 75-yard spools, 16 runs of 10,000 spools each were made at each of...
7149 sym R (9638 sym/38 pcs) 10 img 1 tbl
Tobar_Bret_HW6_STA106
# set global options knitr::opts_chunk$set( echo = TRUE, # show code warning = FALSE, message = FALSE ) Case Study. Brainstorming. A researcher investigated whether brainstorming is more effective for larger groups than for smaller ones by setting up four groups of agribusiness executives, the group sizes being two, three, four,...
6449 sym R (4943 sym/35 pcs) 1 img 1 tbl