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February, 2008
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February, 2008
Taming Uncertainty
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Taming Uncertainty
Information Theory (1)  The Science of Communication
Posted
over 8 years ago
by
sahilthaker
1
Comments
IT is a beautiful subfield of CS with applications across the gamut of scientific fields: coding theory and communications (under unreliable channels), cryptography, physics, biomedical engineering, computer graphics, machine learning, statistics, and...
Taming Uncertainty
Random Sampling over Joins
Posted
over 8 years ago
by
sahilthaker
1
Comments
Source: On Random Sampling over Joins. Surajit Chaudhuri, Rajeev Motwani, Vivek Narasayya, Sigmod 1999. What? Random sampling as a primitive relational operator: SAMPLE(R, f) where R is the relation and f the sample fraction. SAMPLE(Q, f)...
Taming Uncertainty
Converting Between Random Sampling Methods
Posted
over 8 years ago
by
sahilthaker
0
Comments
Sampling f fraction out of n records: Sampling with replacement Sample is a multiset of fn records. Any record could be samples multiple times. Sampling without replacement Each successive sample is uniformly at random from the remaining records...
Taming Uncertainty
Reservoir Sampling
Posted
over 8 years ago
by
sahilthaker
3
Comments
A simple random sampling strategy to produce a sample without replacement from a stream of data  that is, in one pass: O(N) Want to sample s instances  uniformly at random without replacement  from a population size of n records, where n is not...
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