Free programs

StatCalc

Description

StatCalc is a PC calculator that computes table values of many commonly used statistical distributions. It also computes moments, and many other statistics. You may look at the table of contents here. StatCalc also comes with help files.

Get StatCalc

Download StatCalc.zip, extract the files, then click on setup.exe.

• Operating systems supported: Windows 7, XP, 2000; Windows 8.
• Disk space : 10 MB.
• Admin privileges is not required to install the software.

Fortran Programs

Please email your comments to krishna@louisiana.edu

Noncentral t

Fortran program to evaluate the cdf of the noncentral t [Benton, D. and Krishnamoorthy, K. (2003). Computing discrete mixtures of continuous distributions: noncentral chisquare, noncentral t and the distribution of the square of the sample multiple correlation coefficient. Computational Statistics and Data Analysis, 43, 249-267]

Get the noncentral t fortran code

Noncentral chi-square

Fortran program to evaluate the cdf of the noncentral chi-square [ Benton, D. and Krishnamoorthy, K. (2003)]

Get the noncentral chi-square fortran code

Two Proportions

Fortran program: computes the p-value for testing the difference between proportions from two finite populations. [Krishnamoorthy, K. and Thomson, J. (2002). Hypothesis testing about proportions in two finite populations. The American Statistician, 56, (2002), 215-222.]

Get the two proportions fortran code

Power : Two Proportions

Fortran program: computes the power of the test (above) for the difference between proportions from two finite populations. [Krishnamoorthy, K. and Thomson, J. (2002)]

Get the power: two proportions fortran code

Two Poisson Means

Fortran program: computes the p-value for testing the difference between two Poisson means. [Source: Krishnamoorthy, K and Thomson, J. (2004) A more powerful test for comparing two Poisson means. Journal of Statistical Planning and Inference, 119, 249-267]

Get the two Poisson means fortran code

Power: Two Poisson Means

Fortran program: computes the power of the unconditional test for the difference between two Poisson means. [Krishnamoorthy, K and Thomson, J. (2004)]

Get the power: two Poisson means fortran code

Fortran and SAS code

Lognormal mean

Fortran program: computes confidence limits for the mean of a lognormal distribution. [Krishnamoorthy, K. and Mathew, T. (2003) Inferences on the means of lognormal distributions using generalized p-values and generalized confidence intervals. Journal of Statistical Planning and Inference, (2003), 115, 103 – 121]
Get the lognormal mean fortran code
Get the lognormal mean SAS code
View the help file (pdf)

Power: Lognormal mean

Computes the power of the test in (7). For a given mean and standard deviation of the logged data, and the sample size, this program computes the power of the test in (7).
Get the power: lognormal mean fortran code
Get the power: lognormal mean SAS code
View the help file (pdf)

Lognormal: Two-sample

Computes the p-value for testing the difference between two lognormal means. Also, computes the confidence interval for the difference between the means.
Get the lognormal two-sample fortran code
Get the lognormal two-sample SAS code
View the help file (pdf)

Lognormal: Power for Two-sample Test

Computes the power of the test (9) for testing the difference between two lognormal means.
Get the power: lognormal two-sample fortran code
Get the power: lognormal two-sample SAS code
View the help file (pdf)

One-sided limits for exceedance probabilities

Computes the one-sided limits for the exceedance probabilities assuming random effects model. See Krishnamoorthy, K. Mathew, T. and Ramachandran, G. (2007). Upper limits for the exceedance probabilities in one-way random effects model. Annals of Occupational Hygiene, 51, 397-406.

Get the one sided limits SAS code

R code

Log normal exposure multiple detection limits

Krishnamoorthy, K. and Zhao Zu (2011). Confidence Limits for Lognormal Percentiles and for Lognormal Mean based on Samples with Multiple Detection Limits. Annals of Occupational Hygiene, 55, 495-509. Krishnamoorthy, K., Mathew, T. and Xu, Z. (2014). Standardized likelihood inference for the mean and percentiles of a lognormal distribution based on samples with multiple detection limits. Journal of Environmental Statistics, 6, 1–18.

Gamma confidence intervals

This R program computes confidence intervals for gamma parameters and mean, CIs for the difference between two means, difference between two shape parameters. Also, calculates the p-values for testing the mean and parameters, comparing two means, two scale parameters and for comparing two shape parameters. Krishnamoorthy, K. and Luis, N. (2014). Small sample inference for gamma distributions: one- and two-sample problems. Environmetrics, 25, 107-126.

Get the gamma inference R code