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February, 2008
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February, 2008
Taming Uncertainty
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Taming Uncertainty
Reservoir Sampling
Posted
over 6 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...
Taming Uncertainty
Random Sampling over Joins
Posted
over 6 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
Information Theory (1)  The Science of Communication
Posted
over 6 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
Converting Between Random Sampling Methods
Posted
over 6 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...
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