Nondetects
And
Data Analysis (NADA)
Statistics for censored environmental data

Files to download
NADA.pdf
NADA course brochure
KMStats.xls
NEW! Excel worksheet for computing the Kaplan-Meier estimates of descriptive statistics (and UCL95) for censored data.
NADAforMTB27.zip
NADA macros for Minitab v. 2.7. Contains bug fixes for the cSign and KMBMean macros.
NADAdata1_1.zip
Data sets from the NADA textbook. Version 1.1.
NADADocs.zip
Answers to Exercises and Errata Sheet - version 1.0, updated 10/2004.
NADAforR_Examples.pdf
Example use of the NADA for R software package
CROS.zip
SAS macro for Robust ROS. Computes descriptive statistics (mean, etc) for censored data using ROS. This macro correctly sets to missing all nondetects that are higher than all detected values.
mdlwin.zip
Robust ROS Standalone program for Windows. NOTE: This standalone program incorrectly handles nondetects higher than all detected values. These nondetects should be ignored, but are not. Eliminate any nondetects higher than all detects first before using this program. The NADA for MTB and SAS macros correctly set these values to missing.
MDL.sit
Robust ROS Standalone program for Macintosh (Classic only). NOTE: This standalone program incorrectly handles nondetects higher than all detected values. These nondetects should be ignored, but are not. Eliminate any nondetects higher than all detects first before using this program. The NADA for MTB and SAS macros correctly set these values to missing.