ztest

This is similar to the two groups t-test, but using the standard normal (Z) distribution.

t-test

This is a core implementation of 'SAS' procedures for linear models - GLM, REG, ANOVA, TTEST, FREQ, and UNIVARIATE. Some R packages provide Type II and Type III SS. However, the results of nested and complex designs are often different from those of 'SAS'. Different results do not necessarily mean incorrectness. However, many want the same results as 'SAS'. This package aims to achieve that.
Reference: Littell RC, Stroup WW, Freund RJ (2002, ISBN:0-471-22174-0).

Kyun-Seop Bae

sasLM

'SAS' Linear Model

ztest function

<dl> <dt>m1</dt>
<dd>mean of the first (test, active, experimental) group</dd> <dt>s1</dt>
<dd>known standard deviation of the first group</dd> <dt>n1</dt>
<dd>sample size of the first group</dd> <dt>m0</dt>
<dd>mean of the second (reference, control, placebo) group</dd> <dt>s0</dt>
<dd>known standard deviation of the second group</dd> <dt>n0</dt>
<dd>sample size of the second group</dd> <dt>conf.level</dt>
<dd>confidence level</dd> <dt>nullHypo</dt>
<dd>value for the difference of means under the null hypothesis</dd></dl>

Arguments

Author

Test for the difference of two groups' means — ztest

<dl>

 <dt>m1</dt>
<dd>mean of the first (test, active, experimental) group</dd>

 <dt>s1</dt>
<dd>known standard deviation of the first group</dd>

 <dt>n1</dt>
<dd>sample size of the first group</dd>

 <dt>m0</dt>
<dd>mean of the second (reference, control, placebo) group</dd>

 <dt>s0</dt>
<dd>known standard deviation of the second group</dd>

 <dt>n0</dt>
<dd>sample size of the second group</dd>

 <dt>conf.level</dt>
<dd>confidence level</dd>

 <dt>nullHypo</dt>
<dd>value for the difference of means under the null hypothesis</dd>

</dl>

ztest: Test for the difference of two groups' means

Description

Usage

Value

Arguments

Author

Details

See Also

Examples