You are here:
- Home
- Science
- Mathematics
- Probability & Statistics
- ronny fisher
Probability & Statistics/Expert Profile
Expertise
general questions on probability and statistics. please do not send intro prob/stat homework questions.
Experience in the area
have taught probability and stats for 25 years
Education/Credentials
ba in math, phd in stats
Past/Present Clients
federal government, state AG, start-up pharma companies, engineering consulting firms, academic researchers (the list goes on).
Something interesting about this subject that others may not know:
altho it may not seem so to the many unfortunates suffering thru the intro courses each year, stats is REALLY useful if you have data to analyze. as for probability - just for starters - there would be no CAT scans without it. (no quantum theory either)
Average Ratings
Recent Reviews from Users
K = Knowledgeability C = Clarity of Response T = Timeliness P = Politeness| User | Date | K | C | T | P | Comments |
|---|---|---|---|---|---|---|
| Andres | 11/18/09 | 10 | 10 | 10 | 10 | Thanks you so much for your most ..... |
| Kelly | 11/17/09 | 10 | 10 | 10 | 10 | |
| Andres | 11/16/09 | 10 | 10 | 10 | 10 | Thnaks a lot for your very helpful ..... |
| Chen | 11/16/09 | 10 | 10 | 10 | 10 | Thanks a lot. Those terms are "invented" ..... |
| Steve | 11/13/09 | 10 | 10 | 10 | 10 | Very many thanks for your insightful comments ..... |
Recent Answers from ronny fisher
2009-11-16 probability:
andres - if the lift for A and B is 2, but for A, B and C it is 4, you can assume that C is somehow associated with A and/or B [ or both]. if C were independent of both A and B, the lift for A,B,C would
2009-11-15 probability:
andres - you are correct that for 3 independent events, each having probability 0.5, the probability that all 3 occur is (0.5)^3 = .125. the events need not have the same probability either. if two
2009-11-15 Error analysis in linear regression:
chen - i am not familiar with ther expression you call delta m. in particular, i have never seen the quantity you call total deviation used in regression. can you provide a reference for it? the
2009-11-09 Deciding which statistical test(s) to use:
steve - your question does seem to involve testing two hypotheses - and i think your formulation of the null hypothesis is the correct one. let me paraphrase for the record your formulation: for
2009-11-05 counting statistics:
not being a biologist, i do not know what is meant by 'plating cells'. in order to give a cogent response, i need to understand what the measurement [or counting] process actually entails. also,
©2009 About.com, a part of The New York Times Company. All rights reserved.