brain of mat kelcey

i've been trying to get a deeper understanding of latent semantic analysis for awhile now.last week i came to the conclusion the other way to truly understand would be to start from the ground upso here goes; mat's guide to latent semantic analysis via the singular value decomposition (for dummies)...

want to try doing some sentiment analysis work on tweets but i need some good training data.i could label a heap of tweets myself as being positive, neutral or negative but instead this seems to be the perfect job for mechanical turkso i put up 100 'cream cheese' tweets on mechanical turk, asked for 3 opinions per tweet and offered $0.01 per opinion. took under 30 minutes to get back all 300 opinions and only cost $4.50 ($3 for the work, $1.50 admin fee)the results are interesting in themselves...mostly they are consistent;for example all three sentiments for bagels and cream...