TimeSeries Analysis in R
Wednesday, February 1st, 2012When the time comes, this looks like a good tutorial / experience:
Archive for the ‘R’ Category
Image Analysis & Processing in R
Wednesday, February 1st, 2012- http://www.ats.ucla.edu/stat/r/code/svd_demos.htm
- How to read-in and display a [.jpg] image, using the [rimage] package in [R].
- Singular Value Decomposition
- Results in compressed versions of the image
- http://en.wikipedia.org/wiki/Singular_value_decomposition
R: Random Numbers & AutoRegression
Monday, December 19th, 2011- Random number generation and seed-setting
- R Reference Card
- R Language Definition
- http://cran.r-project.org/doc/manuals/R-lang.html#Compound-expressions
- I discovered that the [;] compound expression joiner only works within braces [{]…[}]
- R AutoRegression and TimeSeries
- Time-Series Regression and Generalized Least Squares in R
An Appendix to An R Companion to Applied Regression, Second Edition
by John Fox & Sanford Weisberg
last revision: 11 November 2010 - http://socserv.mcmaster.ca/jfox/Books/Companion/appendix/Appendix-Timeseries-Regression.pdf
- Time-Series Regression and Generalized Least Squares in R
- Econometrics in R
- Grant V. Farnsworth
October 26, 2008 - http://cran.r-project.org/doc/contrib/Farnsworth-EconometricsInR.pdf
- Grant V. Farnsworth
- Quick R
- Multiple (Linear) Regression
- ANOVA
Slopegraph - In General and in R
Friday, July 15th, 2011Slopegraph:
- Suppose you have a table of two columns) and that you want to show graphically how the (two) elements of each row correspond in terms of value. A Slopegraph is useful in this context.
- The originator, Edward Tufte (http://www.edwardtufte.com), says (http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0003nk&topic_id=1) “Slopegraphs compare changes over time for a list of nouns located on an ordinal or interval scale.” Basically: Any time you’d use a line chart to show a progression of univariate data among multiple actors over time, you might have a good candidate for a slopegraph. But some people have found it useful beyond this context.
Links:
- First saw it here: http://alex4d.wordpress.com/2011/07/14/fpx-july-2011-price-changes/
- This is a great example of its usefulness: price-spread variation (y-axis) over time (x-axis)
- Originator of this type of graph: http://charliepark.org/slopegraphs/
- He has implemented it in various tools.
- An R-Function (sourcecode) to do it: https://github.com/bobthecat/codebox/blob/master/table.graph.r
- I tried it and it works.
- e.g. [ table.graph(data.frame( Week1=0:9, Week2=c(1,3,5,7,11,13,17,19,23,29)) ) ]
- http://msenux.redwoods.edu/math/R/dataframe.php explains how to create dataframes in R
- OT: No idea if it can be conveniently done in Apple Mac’s Grapher, but here’s a link about that app: http://guides.macrumors.com/Grapher