ntp_williams: Wiliam's trend test

In ToxicR: Analyzing Toxicology Dose-Response Data

Wiliam's trend test

Description

Williams Trend test for

Usage

ntp_williams(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 Williams trend test for each level in dose_name. For more information on the Williams trend test: doi: 10.2307/2528930 #'

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

• dose: the dose groups relative to control.

• willStat: 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. "William"

Examples

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

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