ntp_shirley: ntp_shirley Shirley's test as programmed at the NTP

In ToxicR: Analyzing Toxicology Dose-Response Data

ntp_shirley Shirley's test as programmed at the NTP

Description

ntp_shirley Shirley's test as programmed at the NTP

Usage

ntp_shirley(formula, data, dose_name = "dose")

Arguments

formula	An equation of the form Y \sim X. Here the variable Y is the response of interest, and X represents discrete experimental conditions. For example, if weight is the dependent variable, and you are interested in looking at the trend across sex one would have 'weight ~ sex'.
data	A data frame with column names in the formula.
dose_name	The name of the variable containing the doses in the data frame data. It is expected multiple doses for each of the experimental conditions X.

Value

The results of a non-parametric Shirley's isotone test for trend on each level in dose_name. For more information see: doi: 10.2307/2529789 The returned list contains:

• X: this represents all the class objects on the right hand side of Y \sim X above.

• dose: the dose groups relative to control.

• testStats: Value of the Shirley test statistic.

• mult_comp_signif: Test's significance as 0, 1, or 2 which is not-significant, significant at the 0.05

• mult_comp_test: The type of test, i.e. "SHIRLEY"

Examples

a = ntp_shirley(weight ~ sex, data=ntp_weight_data)
summary(a)

ToxicR documentation built on Dec. 28, 2022, 3:07 a.m.