I need help debugging this R code for a Reddit sentiment analysis

Learning Goal: I’m working on a r project and need an explanation and answer to help me learn.








# Getting Reddit Data

links<- find_thread_urls(Keywords = “Ghostbusters Afterlife”,

sort_by = “comments”,

subreddit = NA,

period = “all”)

# function to iterate through all posts

content = get_thread_content(links$URL)

funct = function(i){

com = iconv(content$comments, to = ‘utf-8’)

clov = get_nrc_sentiment(com)

x1 = 100*colSums(clov)/sum(clov)

return(cbind(links[i,], t(x1) ))


# list of all the links

ls = list(1:nrow(links))

# loop through all the links and bind to a data frame

out = lapply(ls, funct)

res = do.call(“rbind”,lapply(ls, funct) )

res$date <- as.Date(res$date, “%d-%m-%y”)

# aggregate data by month

res$month = floor_date(res$date, “month”)

# summarize all results

xx = res %>% group_by(month) %>% summarise(positive = mean(positive), negative = mean(negative)) %>% as.data.frame()

# plot results

barplot(xx[,2:3] %>% as.matrix() %>% t(), col=c(“green”,”red”), main = “Sentiment history”, names.arg = xx$month, xlab = “Month”, ylab = “Sentiment”)

opinion.lexicon.pos = scan(‘positive.txt’, what=’character’, comment.char=’;’)

opinion.lexicon.neg = scan(‘negative.txt’, what=’character’, comment.char=’;’)

head(opinion.lexicon.neg) # look at first few negative words

head(opinion.lexicon.pos) # look at first few positive words

# Create getSentimentScore function that will calculate the sentiment score for each tweet

getSentimentScore = function(sentences, words.positive, words.negative, .progress=’none’)


require(plyr) # Require plyr package

require(stringr) # Require stringr package

scores = laply(sentences, function(sentence, words.positive, words.negative) {

# Let first remove the Digit, Punctuation character and Control characters:

sentence = gsub(‘[[:cntrl:]]’, ”, gsub(‘[[:punct:]]’, ”, gsub(‘\\d+’, ”, sentence)))

# Then lets convert all to lower sentence case:

sentence = tolower(sentence)

# Now lets split each sentence by the space delimiter

words = unlist(str_split(sentence, ‘\\s+’))

# Get the boolean match of each words with the positive & negative opinion-lexicon

pos.matches = !is.na(match(words, words.positive))

neg.matches = !is.na(match(words, words.negative))

# Now get the score as total positive sentiment minus the total negatives

score = sum(pos.matches) – sum(neg.matches)


}, words.positive, words.negative, .progress=.progress )

# Return a data frame with respective sentence and the score

return(data.frame(text=sentences, score=scores))


# Calculate a raw sentiment score for each tweet about a movie using the getSentimentScore function

RedditResults = getSentimentScore(links, opinion.lexicon.pos, opinion.lexicon.neg)

View(RedditResults) # View results

# Create a histogram showing the distribution of the raw sentiment scores for each movie

dates$Date <- as.Date(dates$Date)

ggplot(Reddit$Results, aes(x=Date)) + geom_histogram(binwidth=30, colour=”blue”) +

scale_x_date(labels = date_format(“%Y-%b”),

breaks = seq(min(dates$Date)-5, max(dates$Date)+5, 30),

limits = c(as.Date(“2021-10-01”), as.Date(“2021-11-01”))) +

ylab(“Frequency”) + xlab(“Year and Month”) +

theme_bw() + opts(axis.text.x = theme_text(angle=90))

# Install and load psych package



# Calculate descriptive stats for raw sentiment scores for each movie


FYI – I have already had one tutor who was not able to complete the question and fix my code.

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