Cdf statistics committee what does it do
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CDF Statistics Committee: What does it do?. Louis Lyons Oxford + SLAC March 2007. CDF Statistics Committee. Who? Luc Demortier, Rockefeller (chair) John Conway, UC Davis Joel Heinrich, Pennsylvania Tom Junk, Illinois Louis Lyons, Oxford Giovanni Punzi, Pisa Where?

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CDF Statistics Committee: What does it do?

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Cdf statistics committee what does it do

CDF Statistics Committee: What does it do?

Louis Lyons

Oxford + SLAC

March 2007


Cdf statistics committee

CDF Statistics Committee

Who?

Luc Demortier, Rockefeller (chair)

John Conway, UC Davis

Joel Heinrich, Pennsylvania

Tom Junk, Illinois

Louis Lyons, Oxford

Giovanni Punzi, Pisa

Where?

http://www-cdf.fnal.gov/physics/statistics/

When?

Once a month since 2000


Activities

ACTIVITIES

Frequently asked questions

Recommendations

Liasons

Notes on statistical issues

Links to Conferences, papers etc

List of books


Frequently asked questions

Frequently asked questions

Estimating efficiencies near 1

Pull quantities

Error on ratio of Poisson counts

Unbinned maximum likelihood as goodness of fit?

Combining quantities with unknown correlation

Parametrising background shapes for fits

Significance calculation allowing for background uncertainties

Significance from difference in log(L)

Combining significances from different (independent) analyses


Recommendations

RECOMMENDATIONS

Neural networks, support vector machines

Optimising searches

Likelihood fits with individual event errors (Punzi effect)

Coverage for Poisson intervals e.g. ΔlnL = -0.5

Plotting Poisson error bars

Good and bad random number generators

Systematics and limits: the Manhattan project

Bayes and Frequentism

Comparing 2 hypotheses

Simple facts about p-values

Blind analyses


Conclusions

Conclusions

Useful for :--

Giving advice

Spotting some errors

Aiming for uniform practice

Answering queries

Possible improvements :--

More active liasons

Someone at Fermilab to discuss, rather than e-mail

More on multi-variate methods for separating signal from bgd

More software


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