ci.ratio.poisson2

Computes a confidence interval for a ratio of population Poisson rates in a
2-group design. The confidence interval is based on the binomial method
with an Agresti-Coull confidence interval. This function requires the number
of occurences of a specific event (f) that were observed over a specific
period of time (t) within each group.

Implements confidence interval and sample size methods that
are especially useful in psychological research. The methods can be
applied in 1-group, 2-group, paired-samples, and multiple-group designs
and to a variety of parameters including means, medians, proportions,
slopes, standardized mean differences, standardized linear contrasts
of means, plus several measures of correlation and association.
Confidence interval and sample size functions are given for single
parameters as well as differences, ratios, and linear contrasts of
parameters. The sample size functions can be used to approximate the
sample size needed to estimate a parameter or function of parameters
with desired confidence interval precision or to perform a variety of
hypothesis tests (directional two-sided, equivalence, superiority,
noninferiority) with desired power. For details see: Statistical Methods
for Psychologists, Volumes 1 – 4, <https://dgbonett.sites.ucsc.edu/>.

Douglas G. Bonett

statpsych

Statistical Methods for Psychologists

Robert J. Calin-Jageman

ci.ratio.poisson2 function

<dl><dt>alpha</dt>
<dd>alpha value for 1-alpha confidence</dd>
<dt>f1</dt>
<dd>number of event occurences for group 1</dd>
<dt>f2</dt>
<dd>number of event occurences for group 2</dd>
<dt>t1</dt>
<dd>time period for group 1</dd>
<dt>t2</dt>
<dd>time period for group 2</dd></dl>

Arguments

Confidence interval for a ratio of Poisson rates in a 2-group design — ci.ratio.poisson2

<dl>

<dt>alpha</dt>
<dd>alpha value for 1-alpha confidence</dd>


<dt>f1</dt>
<dd>number of event occurences for group 1</dd>


<dt>f2</dt>
<dd>number of event occurences for group 2</dd>


<dt>t1</dt>
<dd>time period for group 1</dd>


<dt>t2</dt>
<dd>time period for group 2</dd>

</dl>

ci.ratio.poisson2: Confidence interval for a ratio of Poisson rates in a 2-group design

Description

Usage

Value

Arguments

Details

References

Examples