Text

Number of reviews

2000    2002    2004    2006    2008    2010    2012

2000    2002    2004    2006    2008    2010    2012

Average

polarity

(Year)

2000    2002    2004    2006    2008    2010    2012      

Positive

polarity

ratio

(Year)

Positive

polarity

ratio

Average

polarity

French press

Pour over

Siphon

Percolator

Topic modeling

• Gensim
• Vectorization (tf-idf)
• Latent Semantic Indexing (LSI)

Topic modeling

• Gensim
• Vectorization (tf-idf)
• Latent Semantic Indexing (LSI)
• Latent Dirichlet allocation (LDA)

Clustering by topics

• K-means (scikit-learn)

• LSI topics top terms:

  Topic 0 : grinder, grind, fine, milk, burr, beans, french, grinds, machine, grinding,

  
  Topic 1 : easy, great, love, makes, perfect, cup, steam, maker, coffee, machine,

  
  Topic 2 : water, grinder, milk, cup, our, your, hot, coffee, machine, great,

  
  Topic 3 : milk, coffee, frothing, steam, maker, grinder, pitcher, grind, pot, wand,

  
  Topic 4 : size, milk, cups, tamper, perfect, easy, nice, fit, machine, glasses,

• K-mean clustering top terms per cluster:

  Cluster 0 words: very, maker, great, makes, works, easy, just, well, out, times,

  
  Cluster 1 words: coffee, makes, maker, machine, cup, water, just, out, great, from,

  
  Cluster 2 words: milk, machine, makes, coffee, just, works, great, up, very, times,

  
  Cluster 3 words: machine, espresso, makes, coffee, works, great, water, very, years, out,

  
  Cluster 4 words: cup, makes, coffee, very, great, maker, just, machine, little, only,

LDA topics