IBMD On-line calculator

The information-based measure of disagreement (IBMD)1 assesses disagreement between two sets of matched numerical observations. It is appropriate for ratio-scale variables with positive values and ranges from 0 (no disagreement) to 1. The 95% confidence interval is estimated using a bootstrap procedure.

Please, enter your data to assess the disagreement between two measurements.

Each pair of observations must be in a different row. The two observations can be space, or tab-delimited.

No file Selected +

The birthweigt(grams) was measured in the same 5 newborns with two diferent observers (A and B).

newborn observer A observer B
1 3220 3290
2 3100 3210
3 2910 3000
4 1990 1995
5 3225 3290

The data can be entered like this:

3220 3290
3100 3210
2910 3000
1990 1995
3225 3290

Citing this software:

If you use this software in preparing a research paper, grant proposal, or other publication, I would appreciate your acknowledging it by citing it in the references.

Costa Santos, C (2012). Information Based Measure of Disagreement On-line Calculator [Computer software]. Retrieved month day, year, from http://disagreement.med.up.pt

  1. Costa-Santos C, Antunes L, Souto A, Bernardes J. Assessment of disagreement: a new information-based approach. Ann Epidemiol. 2010 Jul;20(7):555-61.
  2. Henriques T, Antunes L, Bernardes J, Matias M, Sato D, Costa-Santos C. Information-based measure of disagreement for more than two observers: a useful tool to compare the degree of observer disagreement. BMC Medical Research Methodology 2013, 13:47.
  3. Last updated: March 2012