Altre word cloud e reti di parole

Text mining con Bag-of-Words in R

Ted Kwartler

Instructor

Commonality cloud

# Unisci entrambi i corpora: all_tweets
all_coffee <- paste(coffee_tweets$text,
                    collapse = "")
all_chardonnay <- paste(chardonnay_tweets$text,
                        collapse = "")

all_tweets <- c(all_coffee, all_chardonnay)

# Pulisci all_tweets
all_tweets <- VectorSource(all_tweets)
all_corpus <- VCorpus(all_tweets)
all_clean <- clean_corpus(all_corpus)
all_dm <- TermDocumentMatrix(all_clean)
all_m <- as.matrix(all_tdm)

# Crea la commonality cloud
commonality.cloud(all_m, colors = "steelblue1", 
                  max.words = 100)

commonality cloud

Comparison cloud

# Unisci entrambi i corpora: all_tweets
all_coffee <- paste(coffee_tweets$text, 
                    collapse = "")
all_chardonnay <- paste(chardonnay_tweets$text, 
                       collapse = "")
all_tweets <- c(all_coffee, all_chardonnay)

# Pulisci all_tweets
all_tweets <- VectorSource(all_tweets)
all_corpus <- VCorpus(all_tweets)
all_clean <- clean_corpus(all_corpus)
all_tdm <- TermDocumentMatrix(all_clean)

colnames(all_tdm) <- c("coffee", "chardonnay")

all_m <- as.matrix(all_tdm)
# Crea la comparison cloud
comparison.cloud(all_m, 
    colors = c("orange", "blue"), max.words = 50)

comparison cloud

Grafici a piramide

# Identifica i termini condivisi da entrambi i documenti
common_words <- subset(
  all_tdm_m,
  all_tdm_m[, 1] > 0 & all_tdm_m[, 2] > 0
)

# Trova le parole più spesso condivise
difference <- abs(common_words[, 1] - common_words[, 2])

common_words <- cbind(common_words, difference)
common_words <- common_words[order(common_words[, 3], 
                             decreasing = TRUE), ]
top25_df <- data.frame(x = common_words[1:25, 1], 
                       y = common_words[1:25, 2], 
                       labels = rownames(common_words[1:25, ]))

Grafici a piramide

# Crea il grafico a piramide
pyramid.plot(top25_df$x, top25_df$y, 
             labels = top25_df$labels, 
             main = "Parole in comune",
             gap = 8, laxly = NULL, 
             raxlab = NULL, unit = NULL,
             top.labels = c("Chardonnay", 
                            "Parole", 
                            "Coffee")
)

grafico a piramide

Reti di parole

# Crea la rete di parole
word_associate(coffee_tweets$text,
    match.string = c("barista"), 
    stopwords = c(Top200Words, "coffee", "amp"), 
    network.plot = TRUE, 
    cloud.colors = c("gray85", "darkred"))

# Aggiungi titolo
title(main = "Associazioni tweet su Barista Coffee")

rete di parole

Vamos praticar!

Text mining con Bag-of-Words in R