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Data Science Blog > Data Visualization > Project 1: Exploratory visualizations of Yelp academic dataset

Project 1: Exploratory visualizations of Yelp academic dataset

Sung Pil Moon
Posted on Feb 1, 2016

Contributed by Sung Pil Moon. He is currently in the NYC Data Science Academy 12 week full time Data Science Bootcamp program taking place between January 11th to April 1st, 2016. This post is based on his first class project - R Visualization (due on the 4th week of the program).

NOTE: The dataset, visualizations, and result outputs in this post are NOT representative for any types of overall business, users, reviews in Yelp.
* Main purpose of this post is to utilize several visualization techniques with a large dataset.

1. Yelp Academic Dataset #1 (Small)

1.1. Initial Questions

  • Initial questions before getting the Yelp data set
    • What are properties of average Yelp users?
      • Age, gender distribution, average number of checkin,โ€ฆ?
    • What types of food restaurants are rated higher?
      • vegetarian restaurant, pub, steak restaurant, family restaurant, etc?
      • New Yorkers are more likely to give higher review scores than people in other states?
    • Female users tends to give higher review scores (and / or) more review counts than male users?
    • More restaurants with high review scores in New York than other states?
  • Data Set
    • Yelp Academic Dataset for Yelp Dataset Challenge
    • Requires a permission to download and disclose the results publicly

1.2. Simple exploratory analysis about the Yelp dataset:

After I received the access to download the Yelp dataset, I skimmed through the set to get the basic ideas, including how many tables are, what kinds of information is included in each table, how the tables are inter-connected, and so on.

Basically, the dataset contains a table, Business, consisting of 24 variables, 474,434 observations (289.4 MB).

Variables include

  • business_id: id for each business (primary key)
  • categories: categories names of business, such as pub, โ€ฆ
  • name: name of business
  • stars: review scores in the number of stars (5 max)
  • review_counts: the number of review counts by Yelp users
  • schools: school name(s) near business
  • neighborhood: neighbor businesses
  • city, state, longitude, latitudes, full_address, โ€ฆ more

With variables in the dataset, I realized that I would not be able to get answers to my initial questions. So, I started an exploratory analysis first with these two simple questions:

  • Average review ratings by state
  • More detailed review ratings by state

1.3. Average review ratings by state.

The first exploratory analysis began with looking at average review ratings by each state. Total 348,256 reviews on 13,730 business in 16 states were included in the analysis. The code blocks show the steps how to manipulate the data and load them into a table and on a leaflet map.
a. Pulling the data

dataGroupByStateStar <- ylpDataSmall %>% 
  filter(state != '') %>% mutate(tsum = n()) %>% 
  group_by(state, stars) 

dataForTableByStateStar <- dataGroupByStateStar %>% group_by(state) %>%
  summarise(total_business = n(), total_reviews = sum(review_count), avg_rating = round(mean(stars), 2)) %>% arrange(desc(avg_rating))

b. Loading the data on the table

library(pander)
panderOptions("digits", 3)
pander(dataForTableByStateStar)
state total_business total_reviews avg_rating
NC 500 8147 3.84
TX 1000 23935 3.72
IN 393 3041 3.71
CA 4000 141119 3.69
ON 228 1014 3.69
MI 500 11634 3.66
RI 500 11086 3.64
WA 500 17998 3.64
MA 1298 54477 3.60
GA 500 15455 3.58
VA 189 1503 3.56
PA 1000 20078 3.55
IL 500 7188 3.51
NY 1382 23675 3.49
NJ 500 7904 3.37
MD 500 5813 3.36

c. Loading the data on the Leaflet map

library(leaflet)
leaflet(dataTotalAvgStarByState) %>% addTiles() %>% setView(lng = -96.503906, 
    lat = 38.68551, zoom = 4) %>% addCircles(lng = ~city_lng, lat = ~city_lat, 
    weight = 0, radius = ~exp(totAvgRatingByState * 1.4) * 800, fillOpacity = 0.5, 
    color = ~myCol(totAvgRatingByState),  popup = ~totAvgRatingByState) %>% addLegend("bottomleft", 
    pal = myCol, values = ~sort(totAvgRatingByState), title = "Avg.Ratings", 
    labFormat = labelFormat(prefix = ""), opacity = 0.5)

Map Indicating Average Yelp Review Ratings Distributed By State

These table and map indicate that average review ratings are between 3.36 and 3.84. The rows in the table are sorted in descending order by average review scores. The color of a circle in the leaflet map corresponds to average rating scores shown in the bottom left corner in the map.

In these two plots, North Carolina is the state with the highest rating score (3.84) while Maryland has the lowest rating scores (3.36). Very different from my initial expectation, New Jersey and New York were not ranked within the top 5, but worst 2 and 3. To get more details, I created another plot, a distribution grid of average review rating scores, at a deeper level.

1.4. A grid of detailed average ratings by state.

Basically, the average review rating scores in each state were reclassified from 1.0 to 5.0 by 0.5 increase. For visualization purpose, a percentage of rating score is weighted.

a. Pulling the data

dataWeightedGroupByStateStar <- dataGroupByStateStar %>% 
  summarise(totalByStar = n()) %>% arrange(desc(stars)) %>% 
  mutate(total = sum(totalByStar)) %>% mutate(percent = round((totalByStar / total)*100, 1)) %>%
  mutate(percentWeight = ifelse(percent >= 20, percent * 2.5, # custom column to weight the percent for size on the plot
                                ifelse(percent < 20 & percent >= 15, percent * 1.2, 
                                       ifelse(percent < 15 & percent >= 10, percent,
                                              ifelse(percent < 10 & percent >= 5, percent * 0.8, 1)))))

b. Loading the data on the ggplot bubble plot

library(ggplot2)
ggplot(dataWeightedGroupByStateStar, aes(x = state, y = stars, label = percent)) + 
    geom_point(aes(size = percentWeight * 2, colour = stars, alpha = 0.05)) + 
    geom_text(hjust = 0.4, size = 4) + scale_size(range = c(1, 30), guide = "none") + 
    scale_color_gradient(low = "darkblue", high = "red") + labs(title = "A grid of detailed avg.ratings by state ", 
    x = "State", y = "Detailed Avg.Ratings") + scale_y_continuous(breaks = seq(1, 
    5, 0.5)) + theme(legend.title = element_blank())

A distribution grid of detailed average Yelp reviews ratings by state

In this distribution grid of average rating score, each column indicates a proportion of score by state, while each row indicates a proportion at a specific review score in each state. For example, in the first column, California state has 17.8% of average rating score 5.0, 14.1% of average rating score 4.5, and 19.2% of average rating score 4.0. In the top row, California marked 17.8% of average rating score, Georgia marked 10.6% and Illinois marked 8.8% of average rating score 5.0.

From this grid, we can see the pattern that most states have businesses whose average rating scores are between 3.5 and 4.0. Interestingly, although California has the biggest proportion (17.8%) of an average score of 5.0, North Carolina seems to have more businesses with highest average rating scores (11.8% of 5.0, 20.4% of 4.5, 24.8% of 4.0, and 22.6% of 3.5, respectively). Unfortunately, New Jersey does not seem to be different from in the previous plot. All proportions are rather evenly distributed.

2. Yelp Academic Dataset #2 (Big)

I found another request link to download the Yelp Academic dataset. (The link to request an access is currently missing. I'll update a link once I found). This dataset is quite big (around 1.9GB in csv format) and contains 5 tables:

  • Business (98 variables, 77,445 observations, 30.4MB)
  • User (23 variables, 552,339 observations, 135.9MB)
  • Reviews (10 variables, 2,225,213 observations, 1.64GB)
  • Checkin (170 variables, 55,569 observations, 13.2MB)
  • Tip (6 variables, 591,864 observations, 74.5MB)

2.1. Questions

Before I took a look at the dataset in detail, my initial questions were:

  • Will Restaurants in higher price ranges have higher review rating scores?
  • Will female Yelp users provide more frequent review count?
  • Will users with more followers at Yelp purchase more?
  • Will users with more followers at Yelp check in the business more frequently?

However, Due to privacy issue and missingness within the academic dataset, I couldn't find enough information and description about each entity, especially users, and connections to other tables. So, I had to also change my questions to:

  • Will having more followers at Yelp rate more frequently than other users?
  • Will having more followers at Yelp rate higher than other users?

Before we proceed, we need to know a concept of a special group of users at Yelp, called the 'Elite' user group (reference). They are active Yelp reviewers selected by Yelp's National Elite Squad Council. Selection criteria are unknown. Some of criteria include well-written reviews, high quality tips, a detailed personal profile, an active voting and complimenting record, and a history of playing well with others. They are invited to private events where up-and-coming restaurants and bars provide food and drinks for free.

2.2. [Q1]: Users having more followers at Yelp will rate more frequently?

The first question is about whether having more followers at Yelp will show a tendency to rate more frequently? To see more direct effect, I show visualizations of the overall users, elite users, and normal users separately.

a. Pulling the data

ylpUserSmElite <- ylpUserSm3 %>% filter(elite != "[]")
ylpUserSmNormal <- ylpUserSm3 %>% filter(elite == "[]")

b. Loading the data on the box plot

* All users:

library(ggthemes)
# Yelp users in the boxplot
qplot(fans, review_count, data = ylpUserSm3, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Total review counts by the number of fans") + 
    theme(legend.position = "none")

A chart comparing total number of overall Yelp review counts by number of fans

The first visualization, boxplots, shows slowly but gradually an increase pattern until some points around 1000, then decreases. My hasty assumption is that Yelp users will aggressively provide reviews proportionate to the number of fans. However, once they have enough number of fans (around 1000 in this case), they would less likely to show similar frequency of review activity.

* Elite users:

# Elite Yelp group users in the boxplot
qplot(fans, review_count, data = ylpUserSmElite, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Total review counts by the number of fans (Elite users)") + 
    theme(legend.position = "none")

A chart comparing the total number of overall Yelp review counts by number of elite Yelp users

When we see the elite group alone in this boxplot group, the pattern is similar to the group of overall users. Notably, the number of review counts by outliers in early stages (when they have fewer fans) is quite higher and bigger in frequency than the next stage. It seems that elite users at the early stages provide more reviews to get more followers while elite users in the later stages seem to participate in more activities such as Yelp events for elite group.

* normal users:

# Non-elite Yelp group users in the boxplot
qplot(fans, review_count, data = ylpUserSmNormal, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Total review counts by the number of fans (Non-elite Users)") + 
    theme(legend.position = "none")

 A chart comparing the total number of overall Yelp review counts by number of non- elite Yelp users

This boxplot alone does not provide enough information of their review pattern whether increase or decrease. 50% of review counts seems to be between 50 and 200.
There are a lot of outliers who provided many reviews but couldn't become an elite squad. Possible reasons include an inappropriate content, socially inactive, or remote fake reviews meaning that some who lives in different location, such as Asia, and never been to US and pretend to review a business in San Francisco (and get paid for this fake review).
c. Loading the data on the combination plots (point+smooth) To better understand the pattern, I added the combination plots.
* All users:

# Yelp users in combination plots
qplot(fans, review_count, data = ylpUserSm1, geom = c("point", "smooth"), colour = fans) + 
    labs(title = "Total review counts by the number of fans") + scale_color_gradient(low = "darkblue", 
    high = "darkred") + stat_smooth(fill = "green", colour = "cyan", size = 1, 
    alpha = 0.1)

reviewCount-comb-overall

As shown in the previous boxplots graph for overall users, this plot shows the same pattern.
* elite user group:

# Elite Yelp group users in combination plots
qplot(fans, review_count, data = ylpUserSmElite, geom = c("point", "smooth"), 
    colour = fans) + labs(title = "Total review counts by the number of fans (Elite users)") + 
    scale_color_gradient(low = "darkblue", high = "darkred") + stat_smooth(fill = "green", 
    colour = "cyan", size = 1, alpha = 0.1)

reviewCount-comb-elite

The elite group shows the same pattern in this plot.
* normal users:

# Non-elite Yelp group users in combination plots
qplot(fans, review_count, data = ylpUserSmNormal, geom = c("point", "smooth"), 
    colour = fans) + labs(title = "Total review counts by the number of fans (Non-elite users)") + 
    scale_color_gradient(low = "darkblue", high = "darkred") + stat_smooth(fill = "green", 
    colour = "cyan", size = 1, alpha = 0.1)

reviewCount-comb-normal

This plot shows more detailed pattern of normal users who didn't become an elite user. They also show similar increase pattern, gradual and slow, then starting to decrease at some point when the number of fans reaches to between 175 and 190. One reason for this decrease may be their decreased motivation in spite of their effort. We can also suspect the existence of fake remote reviewers who is an outlier in this plot having around 125 fans and 6000 review counts.

2.3. [Q2]: Users having more followers at Yelp will rate higher?

The second question is about whether having more followers at Yelp is related to higher rate scores? This analysis is done similarly to the previous question.
a. Loading the data on the box plot

* All users:

# Yelp users in the boxplot
qplot(fans, average_stars, data = ylpUserSm3, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Average ratings by the number of fans") + 
    theme(legend.position = "none")

reviewScore-boxplot-overall

In the boxplots of overall users, we can see a pattern that the average rating scores gets increased as the number of fans increases.
* elite user group:

# Elite Yelp group users in the boxplot
qplot(fans, average_stars, data = ylpUserSmElite, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Average ratings by the number of fans (Elite users)") + 
    theme(legend.position = "none")

reviewScore-boxplot-elite

The boxplot graph also shows the similar pattern as the previous one. Here, I'm a little bit curious about the elite group, especially having more than 1000 followers, whether they try to show themselves as nice reviewers providing higher rate scores, and whether they were invited better businesses more often as the number of fans increases.
* normal users:

# Non-elite Yelp group users in the boxplot
qplot(fans, average_stars, data = ylpUserSmNormal, geom = "boxplot", group = Fan_Size, 
    color = Fan_Size) + labs(title = "Average ratings by the number of fans (Non-elite users)") + 
    theme(legend.position = "none")

reviewScore-boxplot-normal

This boxplot for normal users does not tell much about the pattern, except for that 50% of average ratings are between 3.5 and 4.0.

c. Loading the data on the combination plots (point+smooth)

* All users:

# Yelp users in combination plots
qplot(fans, average_stars, data = ylpUserSm1, geom = c("point", "smooth"), colour = fans) + 
    labs(title = "Average ratings by the number of fans") + scale_color_gradient(low = "darkblue", 
    high = "darkred") + stat_smooth(fill = "green", colour = "cyan", size = 1, 
    alpha = 0.1)

reviewScore-comb-overall

This combination plot for overall users shows a similar gradual but slow increase pattern in the boxplot above for overall users. Interestingly, for users who do not have many fans, the range of their reviews are quite wider than the ones of users having more fans.
* elite user group:

# Elite Yelp group users in combination plots
qplot(fans, average_stars, data = ylpUserSmElite, geom = c("point", "smooth"), 
    colour = fans) + labs(title = "Average ratings by the number of fans (Elite users)") + 
    scale_color_gradient(low = "darkblue", high = "red") + stat_smooth(fill = "green", 
    colour = "cyan", size = 1, alpha = 0.1)

reviewScore-comb-elite

This plot shows the similar gradual but slow increase pattern as the number of fans increase.
* normal users:

# Non-elite Yelp group users in combination plots
qplot(fans, average_stars, data = ylpUserSmNormal, geom = c("point", "smooth"), 
    colour = fans) + labs(title = "Average ratings by the number of fans (Non-elite users)") + 
    scale_color_gradient(low = "darkblue", high = "red") + stat_smooth(fill = "green", 
    colour = "cyan", size = 1, alpha = 0.1)

reviewScore-comb-normal

Differently from previous plots above, normal user group do not show steady increase pattern as the number of fans increase. Possible reason include they are less biased by the number of fans or they rated negatively as they were not selected as elite squad.

3. Conclusions

3.1. Findings

  • A relationship between the number of followers at Yelp and average rating frequency
    • Yelp users tend to rate more frequently until some point as the number of followers increase
  • A relationship between the number of followers at Yelp and average rating scores
    • Yelp users, (specifically Elite users), tend to rate more higher as the number of followers increase.
    • Interesting to investigate whether they try to show themselves as nice reviewers and whether they are more invited to better business as the number of fans increase?
  • Other
    • It seems that the existence of remote fake reviewer is possible.

3.2. Next steps

  • Implement these datasets within an interactive Shiny app
  • Incorporate statistical analyses for significance of the result

NOTE: The dataset, visualizations, and result outputs in this post are NOT representative for any types of overall business, users, reviews in Yelp.

About Author

Sung Pil Moon

Sung Moon is a recent graduate from the Ph.D. program in Human-Computer Interaction, School of Informatics, Indiana University (Indianapolis, IN). Through several startup activities and various research projects collaborating with MITRE, a research corporation, he found opportunities to...
View all posts by Sung Pil Moon >

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Hi Sung, I have downloaded the Yelp dataset but I can't seem to find reviews for restaurants located in New York. Are you using an old dataset? Are you able to share? I'm looking for Yelp reviews data on New York city restaurants. Thanks!
ๅคงๆ•ฐๆฎๆ—ฅๆŠฅ2016-02-01 ็”จ Docker ๆž„ๅปบๅˆ†ๅธƒๅผ Redis ้›†็พค ็ญ‰19ๆก โ€“ IT้’ๅนด่ˆ February 3, 2016
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