Articles by R on Thomas Roh

PE Industrial Engineer Reference Sheet

May 8, 2018 | R on Thomas Roh

You contribute to the reference sheet here: Systems Definition, Analysis, and Design System Analysis and Design Tools Cause-Effect Diagram (Fishbone) Pareto Analysis 80% of the items represent 20% of the sales or 20% of the items represent 80% of the cost. This law is a rule of ...
[Read more...]

fitur 0.5.25 Release

March 13, 2018 | R on Thomas Roh

Fixed appearance of plots Added plot_density function for comparison pdfs of fitted functions Updated argument naming conventions fitur on CRAN Density Diagnostic Plot
x <- rgamma(10000, 5)
dists <- c('gamma', 'lnorm', 'weibull')
fits <- lapply(dists, fit_univariate, x = x)
plot_density(x, fits, nbins = 20)
QQ-Plot The output is a ggplot object so you can add colors, styling, etc.
plot_pp(x, fits) +
PP-Plot You can also zoom in on different areas.
plot_qq(x, fits) +
  scale_color_tr() +
  coord_cartesian(xlim = c(5,10))
[Read more...]

Building Distribution Reference Tables in R

March 9, 2018 | R on Thomas Roh

I’ve recently been studing for a professional exam that does not allow computers or advanced calculators. Some of the subject matter will require use of a few statistical distributions which can be very time-consuming to calculate manually. In lieu of access to statistical functions, you are allowed to bring ...
[Read more...]

Queueing Notation

January 12, 2018 | R on Thomas Roh

Queueing theory has some commonly accepted shorthand to describe characteristics of queuing models. Although across books and peer reviewed articles you will see slight variations, this post outlines commonly accepted terms for reference. Kendall’s Notation Kendall’s notation was proposed as a standard for describing queueing models. You may ...
[Read more...]

fitur 0.5.20 Release

December 19, 2017 | R on Thomas Roh

DESCRIPTION summary has been updated Examples have been updated for fit_univariate, fit_empirical fit_empirical_discrete and fit_empirical_continuous are no longer exported added plot_qq and plot_pp functions for diagnostic plotting of fits Added ... [Read more...]

MMC Queues

December 2, 2017 | R on Thomas Roh

Introduction Queueing Theory is the quantitative study of operational characteristics of a system of workflows for a service/process given a processing time, an arrival pattern, and a limitation of resources. It can answer questions such as: How long would a customer/part/etc. (entities) wait to be processed? What ... [Read more...]
1 2

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)