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Description: This meetup is for anyone interested in learning and sharing knowledge about analyzing Reddit data using R. In this tutorial, we will be using RedditExtractoR and a few other R packages to analyze a dataset of Reddit posts.

Text mining is the process of analyzing large collections of unstructured text data to discover patterns, trends, and insights. With the rise of social media platforms like Reddit, there is a wealth of information available in the form of user-generated content that can be analyzed using text mining techniques.

R is a popular programming language and environment for statistical computing and graphics, widely used in data analysis and data visualization. In recent years, it has also become a powerful tool for text mining and natural language processing.

In this Meetup event, we will explore how to use R for text mining of Reddit data. We will walk through the process of collecting data from Reddit using its API, cleaning and preprocessing the data, and applying text mining techniques such as sentiment analysis and topic modeling. By the end of the session, you will have a basic understanding of how to use R for text mining of social media data and be able to apply these techniques to other similar datasets.

Who should attend?

This meetup is open to all skill levels.

Requirements: Participants should bring their laptops to the online event. Basic knowledge of R programming is recommended, but not required. Internet access will be required to access Yahoo Finance pages during the live coding session.

Processing data

Using a few R packages, we will clean and preprocess the data to prepare it for analysis. We will remove stop words, punctuations, and URLs from the text data.

This will create a corpus of the post titles and remove punctuations, URLs, and stop words. We also perform stemming to reduce words to their root form.

Creating a Document Term Matrix

We will now create a document term matrix to represent the text data.

Text Analysis using tm and other packages

We can now perform text analysis using tm and other packages. We will start by creating a few plots (word cloud, etc.) to visualize the most frequent words in the post titles.

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## Rows: 701 Columns: 7
## ── Column specification ────────────────────────────────────────────────────────
## Delimiter: ","
## chr  (4): title, text, subreddit, url
## dbl  (2): timestamp, comments
## date (1): date_utc
## 
## ℹ Use `spec()` to retrieve the full column specification for this data.
## ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
## spc_tbl_ [701 × 7] (S3: spec_tbl_df/tbl_df/tbl/data.frame)
##  $ date_utc : Date[1:701], format: NA "2023-04-05" ...
##  $ timestamp: num [1:701] NA 1.68e+09 1.68e+09 1.68e+09 1.68e+09 ...
##  $ title    : chr [1:701] NA "Anyone know what type of shoes these are? bought in JD in 2021, says air on the back. (i lost them and forgotte"| __truncated__ "What kind of nikes are these? They look custom? Do u think they would stay held together like the paint and stuff?" "Hey yall, i was wondering if this is legit. Thrifted it and cant find any info about it." ...
##  $ text     : chr [1:701] NA NA "Also what do u think they are worth? What kind of nikes r they?" NA ...
##  $ subreddit: chr [1:701] NA "Nike" "Nike" "Nike" ...
##  $ comments : num [1:701] NA 1 2 0 2 0 11 6 0 0 ...
##  $ url      : chr [1:701] NA "https://www.reddit.com/r/Nike/comments/12cw2do/anyone_know_what_type_of_shoes_these_are_bought/" "https://www.reddit.com/r/Nike/comments/12boqfh/what_kind_of_nikes_are_these_they_look_custom_do/" "https://www.reddit.com/r/Nike/comments/12aub6v/hey_yall_i_was_wondering_if_this_is_legit/" ...
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##   ..   date_utc = col_date(format = ""),
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##   ..   subreddit = col_character(),
##   ..   comments = col_double(),
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## [1] 701
## [1] 7
##  chr [1:701] NA NA ...
## [1] NA                                                                                                                                                                    
## [2] NA                                                                                                                                                                    
## [3] "Also what do u think they are worth? What kind of nikes r they?"                                                                                                     
## [4] NA                                                                                                                                                                    
## [5] "Can anyone help me find these? Or know what kind they were?"                                                                                                         
## [6] "I've been looking at Blazers at Nike, but they are not the same as they were a week ago. Some left, some new came instead. How often do Blazers change in the store?"
## [1] NA NA NA NA NA NA
## <<VCorpus>>
## Metadata:  corpus specific: 0, document level (indexed): 0
## Content:  documents: 701
## $content
## [1] "Why doesn\031t  Ebay authenticate all shoes?\r\nDoes the seller make that decision?"
## Error in FUN(X[[i]], ...): unused argument (mc.cores = 1)
##              word freq
## nike         nike  104
## shoes       shoes   79
## just         just   67
## know         know   63
## pair         pair   63
## like         like   58
## anyone     anyone   55
## can           can   48
## shoe         shoe   48
## find         find   47
## buy           buy   44
## get           get   42
## help         help   38
## one           one   38
## i\031m     i\031m   35
## size         size   35
## looking   looking   34
## white       white   34
## thanks     thanks   31
## back         back   29
## new           new   28
## time         time   27
## air           air   26
## got           got   26
## i\031ve   i\031ve   26
## now           now   26
## online     online   26
## really     really   26
## store       store   26
## also         also   25
## want         want   25
## bought     bought   24
## look         look   24
## the           the   23
## anything anything   22
## tried       tried   22
## found       found   20
## https       https   20
## think       think   20
## years       years   20
## does         does   19
## dunks       dunks   19
## sure         sure   18
## way           way   18
## black       black   17
## see           see   17
## will         will   17
## even         even   16
## jordan     jordan   16
## make         make   16

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References

‘RedditExtractoR’ - An R Package that helps you access the Reddit API: https://github.com/ivan-rivera/RedditExtractor

What Are APIs? - Simply Explained: https://www.youtube.com/watch?v=OVvTv9Hy91Q