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version (1.1 KB) by Raymond Reynolds
calculates 90, 95 or 99% confidence interval.


Updated 27 Nov 2006

No License


90%, 95% or 99% confidence interval of a vector or 2d matrix
Optional dim refers to dimension and must be 1 or 2 (default is 1).
Optional confidence must either 90, 95 or 99 (default is 95).

Calculated as the standard error multiplied by the critical two-tailed value of t for a=0.10, 0.05 or 0.01 (see Statistical methods in psychology, D.C. Howell). This formula applies when the Population standard deviation is unknown. As n gets larger then the t distribution approaches the normal distribution. So, if n>120, uses z instead of t (e.g. 1.96 standard errors, for 95% interval)

Raymond Reynolds 23/11/06

Cite As

Raymond Reynolds (2021). ci.m (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R13
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired: Reverberation Time Calculator


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