Evaluation of non-occurrence by TI-59 programmable calculator

M. Haddad*, H. Farbstein, H. Gutman, A. Koren, A. Zelikovski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A TI-59 programmable calculator program is presented for calculating either risk probability, sample size or confidence level (given 2 of the 3 variables) in cases in which an event of concern did not occur, or as expressed mathematically, had zero numerators. Its main usefulness is as a tool for interpreting previously published data containing no adverse event of concern while contemplating medical alternatives. These conditions are not infrequent in rare medical events--either diseases or complications. However, applicability of the program extends beyond these confines, exemplified in experimental planning for considering expected sample size or in calculating certainty in terms of confidence level.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
Issue number4
StatePublished - 15 Feb 1991
Externally publishedYes


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