The EnvStats functions listed below are useful for computing tolerance intervals. See Power and Sample Size for a list of functions useful for computing power and sample size for a design based on a tolerance interval width.
| Function Name | Description | 
  tolIntGamma,               | 
Tolerance interval for a Gamma distribution. | 
  tolIntGammaAlt             | 
|
  tolIntLnorm,               | 
Tolerance interval for a lognormal distribution. | 
  tolIntLnormAlt             | 
|
  tolIntNorm                 | 
Tolerance interval for a Normal (Gaussian) distribution. | 
  tolIntNormK                | 
Compute the constant \(K\) for a Normal (Gaussian) | 
| tolerance interval. | |
  tolIntNpar                 | 
Nonparametric tolerance interval. | 
  tolIntPois                 | 
Tolerance interval for a Poisson distribution. |