TumorRate: Perform chi-squared test for equivalence of tumor rates...

In jstansfield0/TumorRate: Performs chi-squared test from Peto 1974 on carcinogen studies

Description

Perform chi-squared test for equivalence of tumor rates between treatments

Usage

TumorRate(a, b)

Arguments

a

A matrix object with rows corresponding to the different treatments and columns correspond to the time periods observed. In the case of incidental tumors discovered at necropsy Matrix a should contain the counts of the number of necropsies at which a tumor was found. In the case of comparing the rates of tumors diagnosed during life or which caused the death of the animal matrix A should containn the number of animals which died of a tumor or had a tumor diagnosed during the week.

b

A matrix object with rows corresponding to the treatments and columns corresponding to the time periods observed. In the case of incidental tumors discovered at necropsy matrix B should contain the number of necropsies of animals which did not have a tumor diagnosed before death and which did not die of a tumor. In the case of comparing the rates of tumors diagnosed during life or which caused the death of the animal matrix B should contain the number of animals still alive without a diagnosed tumor at the beginning of the week.

Value

The chi-squared test p-value.

Examples

# Input data
t1 <- matrix(c(0, 0, 0,
1, 0, 1,
2, 0, 5,
2, 1, 11,
3, 1, 3,
1, 0, 0), nrow = 3, ncol = 6,
byrow = FALSE)
t2 <- matrix(c(4, 7, 12,
               5, 5, 10,
               7, 8, 15,
               10, 12, 28,
               9, 8, 3,
               2, 3, 0), nrow = 3, ncol = 6,
             byrow = FALSE)
# Perform chi-squared test
TumorRate(t1, t2)

jstansfield0/TumorRate documentation built on May 22, 2019, 5:34 p.m.