Excel spreadsheet and R code to annimate a 'statistical hammock'
illustrating the effect of collinearity (correlation) on fitted regression coefficients .
R code to extract underlying data from Kaplan Meier
and Nelson-Aalen curves along with some worked examples.
Applet (Flash) to illustrate different fitting methods and different model assumptions
for a very small dataset with 2 datapoints and 1 parameter.
Computer code to simulate datasets with measurement error
and look at sampling distribution of parameter estimates
Animation (in R) of effects of errors in X on slope of Y on X
Article in 'Research methods & reporting series'. J Hutcheon, A Chiolero and J Hanley.
BMJ 2010;340: 1402- 1406. c2289, doi: 10.1136/bmj.c2289 (Published 23 June 2010)
Links between Poisson, Gamma and Chi-sq distributions -- Fisher1935.
One must travel 7500 Km by 4-wheel jeep, over very rough terrain, with no possibility of repairing a tire that becomes ruptured.
Suppose one starts with 14 intact tires (the 4, plus 10 spares).
On average, tires rupture at the rate of 1 per 5,000 tire-Kms (the mean interval between ruptures is 5,000 tire-Kms). Ruptures occur independently of the of tire position or the distance already driven with the tire (i.e., the sources of failure are purely external). Ignore the possibility of multiple failures from a single source, e.g. a short bad section of the trail.
Suppose one starts with 10 intact tires (the 4, plus 6 spares).
R code Java Applet
SAS code [including link to dataset] for bootstrap standard error of estimate of First Principal Component: Appendix to article "Creating non-parametric bootstrap samples using Poisson frequencies" in Computer Methods and Programs in Biomedicine. 2006 Jul;83(1):57-62; authors: James A. Hanley and Brenda MacGibbon.
SAS implementation of the 'placement' or 'U-statistics' method described in Hanley JA and Hajian-Tilaki KO. Sampling Variability of Nonparametric Estimates of the Areas under Receiver Operating Characteristic Curves: An Update. Academic Radiology, 1997 4:49-58. SAS Program
Article by Hanley and Hajian-Tilaki. Sampling Variability of Nonparametric Estimates of the Areas under Receiver Operating Characteristic Curves: An Update. Academic Radiology, 1997 4:49-58. pdf
Article by Hanley and McNeil "A Method of Comparing the Areas under ROC curves derived from same cases." Radiology 1983: 148: 839-843. pdf
Appendix to Hanley and McNeil Radiology "A Method of Comparing the Areas under ROC curves derived from same cases." Radiology 1983: 148: 839-843. pdf
Updated: March 29, 2018