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- W436928147 abstract "groups which can then be tested with the Z-test. CONTRAST is a FORTRAN program that implements the Sauer and Williams (1989) procedure. Input data for CONTRAST are the rate estimates si (here denoted by s, as we assume that most applications of the procedure will analyze survival rates), along with associated variances var(s'i) and covariances cov(s'j, so). Data can either be entered interactively or stored in a separate input file. Output from the program is both displayed on the screen and printed to disk. CONTRAST first prompts for entry of data or an input filename, then computes the Chiquare test statistic for hypothesis (1). The user is then prompted to either specify a contrast, which defines a simple hypothesis (2) or to specify groups (N ' 2) of rates to be tested. If a contrast is selected, a Chi-square test that is equivalent to the Brownie et al. (1985) Z-test is calculated. If more than 2 groups are selected, group means, variances, and covariances are calculated, and a Chi-square statistic is calculated for this composite hypothesis of equal group means. See Sauer and Williams (1989) for a discussion of the multiple comparison procedures. The program source code, executable code, user documentation, and test data are available on the southeastern software and message exchange (SESAME), and a detailed user's manual for the program is available from the authors. CONTRAST was written using the Ryan McFarland FORTRAN compiler (and the 8087 emulator library), so a math coprocessor is not required. The program should run on all IBMPC compatible computers. Size of the program depends upon the maximum number of survival rates. The program presently uses <256K of memory and is set up to compare ' 50 estimates of survival rates. Maximum number" @default.
- W436928147 created "2016-06-24" @default.
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- W436928147 date "1989-01-01" @default.
- W436928147 modified "2023-10-03" @default.
- W436928147 title "Testing for differences among survival or recovery rates using program CONTRAST" @default.
- W436928147 hasPublicationYear "1989" @default.
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