![]() The BACKTRAN program can be used to transform probit-, logit-, or CLL-transformed data back to the original units (proportion organisms responding to the stimulus) to help assess goodness of fit. The backtransformation programs use output from the PROBIT program, or from any other probit analysis program. The program PROBIT2 does the same thing, but will calculate all six possible transformations at one time. All information for complete reporting of probit analyses is provided by the program, including: the slopes and intercepts, with their variances and covariance the chi-square for goodness-of-fit of the regression line and lethal time values, with confidence limits. Our program gives you the option of using any of six possible transformations of the data (probit, logit, CLL, log-probit, log-logit, log-CLL). Journal of Economic Entomology 82: 1534-1542). Instead, use the program by Preisler and Robertson (1989. If you made multiple observations over time at more than one dose in a single study, don't use this program to analyze those data. The PROBIT program is used to analyze bioassay data when multiple observations over time were made on the same groups of organisms at one dose of a stimulus. The programs are ready to run in Mathematica (see instructions for running the programs below).zip file (a Windows zip utility can be found at zip file to your Documents folder (this is the default directory where Mathematica looks for files), and then delete the. Instructions for downloading and installing files Descriptions of numerical methods used - methods.zip. ![]() Backtransformation programs - btprogs.zip.Descriptions of the programs are given below. Use the following links to download the programs (zip files). ![]() Note: The programs were updated in June 2013 so that the programs will run in either Wolfram Mathematica 9 or Wolfram Player Pro. If you do not have a site license or do not have the Mathematica or Player Pro software package on your computer, you will not be able to run the programs that I have written. Player Pro is not a full implementation of the Mathematica software package, but it will allow you to run programs written in the Mathematica language. If you don't have a site license, the Player Pro software package is more economical to purchase if you will only be using the software to run the probit programs that I have written. Note: to determine whether you have free access to Mathematica, visit the Mathematica web site ( and the web site will automatically notify you if you have a site license. You must have the Wolfram Mathematica or Wolfram Player Pro software on your computer to run these programs. The programs are written in the Mathematica language. These programs are used for statistical analysis of data from bioassay studies, such as determining the effects of insecticides on insect mortality.
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