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Understanding the CDF Statistics Committee: Roles, Activities, and Recommendations

The CDF Statistics Committee has been active since March 2000, chaired by Luc Demortier. This committee aims to ensure best practices in statistical analysis within CDF at Fermilab, providing vital resources such as frequently asked questions, recommendations for statistical methods, and guidance on efficiency estimation and significance calculation. They meet once a month to discuss issues and share knowledge, facilitating collaboration through links to conferences, papers, and books, ultimately improving the consistency and quality of analysis in high-energy physics.

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Understanding the CDF Statistics Committee: Roles, Activities, and Recommendations

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  1. CDF Statistics Committee: What does it do? Louis Lyons Oxford + SLAC March 2007

  2. 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

  3. ACTIVITIES Frequently asked questions Recommendations Liasons Notes on statistical issues Links to Conferences, papers etc List of books

  4. 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

  5. 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

  6. 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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