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https://issues.apache.org/jira/browse/STATISTICS-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739388#comment-17739388
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Anirudh Joshi commented on STATISTICS-71:
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{quote}[...] What about {{Count}} being a {{{}DoubleStorelessStatistics{}}}, on
which other(s) could depend?
{quote}
I was thinking the same to avoid redundant computations while computing
multiple statistics. We could implement count as a standalone statistic and use
composition to avoid redundant computations while computing multiple statistics
?
DoubleStorelessUnivariateStatistic add(double d);
{quote}{{[...] What's the intended usage?}}{{ }}
{quote}
{{The reason I included this signature is to possibly support chaining during
the add calls like}}
{code:java}
Mean m = new Mean();
double mean = m.add(1).add(2).add(3).getAsDouble();
double mean = Stream.of(1.0, 2.0, 3.0).map(Mean::add).getAsDouble();{code}
{quote}
[...] E.g. is "Storeless" a required part of the name? Or is it an
"implementation detail"?
{quote}
I changed the interface name to DoubleStorelessUnivariateStatistic since I feel
we might actually need 3 interfaces, IntStorelessSummaryStatistics for integer
data and LongSummaryStatistics for long data, similar to JDK SummaryStatistics.
I feel its better to have Storeless as part of the interface name to make it
clear that it is a storeless implementation, so that users are aware that they
cannot do certain things like compute rolling statistics for instance. But I do
not have a strong opinion on this and curious to hear other arguments against
the naming (e.g. if the name is too verbose)
{quote}
[...] be more restrictive in order to forbid meaningless combinations?
{quote}
Not sure if I understand the requirement correctly. What are the kinds of
combinations we want to restrict here ?
> Implementation of Univariate Statistics
> ---------------------------------------
>
> Key: STATISTICS-71
> URL: https://issues.apache.org/jira/browse/STATISTICS-71
> Project: Commons Statistics
> Issue Type: Task
> Components: descriptive
> Reporter: Anirudh Joshi
> Priority: Minor
> Labels: gsoc, gsoc2023
>
> Jira ticket to track the implementation of the Univariate statistics required
> for the updated SummaryStatistics API.
> The implementation would be "storeless". It should be used for calculating
> statistics that can be computed in one pass through the data without storing
> the sample values.
> Currently I have the definition of API as (this might evolve as I continue
> working)
> {code:java}
> public interface DoubleStorelessUnivariateStatistic extends DoubleSupplier {
> DoubleStorelessUnivariateStatistic add(double v);
> long getCount();
> void combine(DoubleStorelessUnivariateStatistic other);
> } {code}
>
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