Harvard University GroupLens Research and Rating Distribution RStudio Project: Java Answers 2021

Harvard University GroupLens Research and Rating Distribution RStudio Project: Java Answers 2021

Harvard University GroupLens Research and Rating Distribution RStudio Project: Java Answers 2021

Question Title:

Harvard University GroupLens Research and Rating Distribution RStudio Project

Full Question:

Unformatted Attachment Preview

MOViELENSSCRIPT.R
jenniferyoung
2021-04-17
#Jennifer Young
#Movie Recommendation Project
#Recommendation systems are used more and more, as consumers expect suggestions based
#on their known likes so that they can discover new likes in products, movies, music
#and other interests. They assist users in finding what they might be interested in
#based on their preferences and previous interactions. In this report, a movie
#recommendation system using the MovieLens dataset from HarvardX’s Data Science
#Professional Certificate3 program will be covered. GroupLens Research is the
#organization that collected the data sets for this project from their site:
#(https://movielens.org).
## First specify the packages of interest
packages = c(“tidyverse”, “caret”,
“ggplot2”)
## Now load or install&load all
package.check %
group_by(title) %>%
summarize(rating = rating, n_rating = count) %>%
slice(1:20) %>%
knitr::kable()
title
100 Feet (2008)
4 (2005)
5 Centimeters per Second (Byôsoku 5 senchimêtoru) (2007)
Accused (Anklaget) (2005)
Ace of Hearts (2008)
Ace of Hearts, The (1921)
Adios, Sabata (Indio Black, sai che ti dico: Sei un gran figlio di. . . ) (1971)
Africa addio (1966)
Archangel (1990)
Bad Blood (Mauvais sang) (1986)
Battle of Russia, The (Why We Fight, 5) (1943)
Bell Boy, The (1918)
Black Tights (1-2-3-4 ou Les Collants noirs) (1960)
Blind Shaft (Mang jing) (2003)
5
rating
n_rating
2.0
2.5
3.5
0.5
2.0
3.5
1.5
3.0
2.5
4.5
3.5
4.0
3.0
2.5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
title
Blue Light, The (Das Blaue Licht) (1932)
Borderline (1950)
Boys Life 4: Four Play (2003)
Brothers of the Head (2005)
Caótica Ana (2007)
Chapayev (1934)
rating
n_rating
5.0
3.0
3.0
2.5
4.5
1.5
1
1
1
1
1
1
#User ratings (Histogram)
edx %>%
count(userId) %>%
ggplot(aes(n)) +
geom_histogram(bins = 25, color = “green”) +
scale_x_log10() +
xlab(“Number of ratings”) +
ylab(“Number of users”) +
ggtitle(“Number of ratings given by users”)
Number of ratings given by users
8000
Number of users
6000
4000
2000
0
10
100
1000
Number of ratings
#Mean user ratings
edx %>%
group_by(userId) %>%
filter(n() >= 100) %>%
summarize(b_u = mean(rating)) %>%
ggplot(aes(b_u)) +
geom_histogram(bins = 25, color = “white”) +
6
10000
xlab(“Mean rating”) +
ylab(“Number of users”) +
ggtitle(“Mean movie ratings given by users”) +
scale_x_discrete(limits = c(seq(0.5,5,0.5))) +
theme_light()
## Warning: Continuous limits supplied to discrete scale.
## Did you mean `limits = factor(…)` or `scale_*_continuous()`?
Mean movie ratings given by users
4000
Number of users
3000
2000
1000
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Mean rating
#compute the RMSE
RMSE %
pull(b_i)
model_1_rmse %
group_by(userId) %>%
filter(n() >= 100) %>%
summarize(b_u = mean(rating – mu – b_i))
user_avgs%>% qplot(b_u, geom =”histogram”, bins = 25, data = ., color = I(“magenta”))
4000
3000
2000
1000
0
−2
−1
0
1
b_u
user_avgs %
left_join(movie_avgs, by=’movieId’) %>%
group_by(userId) %>%
summarize(b_u = mean(rating – mu – b_i))
predicted_ratings %
left_join(movie_avgs, by=’movieId’) %>%
left_join(user_avgs, by=’userId’) %>%
mutate(pred = mu + b_i + b_u) %>%
pull(pred)
model_2_rmse %
left_join(b_u, by = “userId”) %>%
mutate(pred = mu + b_i + b_u) %>%
pull(pred)
})
return(RMSE(predicted_ratings, validation$rating))
qplot(lambdas, rmses)
10
0.8655329
rmses
0.8654
0.8652
0.8650
0.0
2.5
5.0
7.5
10.0
lambdas
lambda

Purchase answer to see full
attachment

This question was handled by a Studyhelp247 Java tutor and the student left a positive review. 19+ custom answers have been given to students for this question in November 2021 alone. To avoid plagiarism and maintain student privacy, we do not resell answers. Get your custom solution now. It is affordable.

Bram Eldoff, Founder, Studyhelp247.com

Consider this Java Assignment Done
Beat its deadline and stringent requirements.

[advanced_iframe securitykey=”your key” use_shortcode_attributes_only=”true” src=”https://core.studyhelp247.com/main-site-question-post/” id=”example4″ height=”350″ width=”450″ show_part_of_iframe=”true” show_part_of_iframe_x=”-100″ show_part_of_iframe_y=”75″ show_part_of_iframe_width=”450″ show_part_of_iframe_height=”350″ show_part_of_iframe_new_window=”_top” show_part_of_iframe_new_url=”https://core.studyhelp247.com/new-question-posting/”]

>Approximate cost: $8 per page.<br>>Choose your own tutor.<br>>Get free revision, plagiarism reports, and a list of sources.<br>>Release the money only after delivery

How it Works

hw

Why you should post this Java question now.

Flawless Deliveries
Our tutors deliver fault free assignments after careful and detailed research. All instructions are followed to the letter.

100% Originality Guarantee
Every task delivered to students on our platform has 100% originality guarantee. Find plagiarism, get 100% money back.

Timely Deliveries
When you post a question here, we assure on-time delivery, or 100% money back. You cannot miss deadlines with us.

24/7 Customer Support
Our support agents are always online, ready to help you when using our platform. It only gets better.

Student-Friendly Prices
Getting quality help should not break your pocket. Find instant quality help for whatever budget you have.

Free Revisions
You can request your tutor for as many revisions as needed to ensure you are 100% satisfied with our services.

100% Privacy
Every action you take on our platform is anonymous. Once you receive your help, it is almost as if you weren’t here.

100% Refunds
If a tutor breaks any of our guarantees, you get 100% money back to ask questions in the future. No questions.

Here are other questions on different subjects that our tutors have handled with excellent results.

The first ones are Middle East College General Mathematics Worksheet and Central Georgia Technical College Business Statistics Questions which required in-depth research and computations. The third and fourth ones are Harvard University GroupLens Research and Rating Distribution RStudio Project and CALUMS Computing Accreditation Commission of ABET Discussion, which called for experts to help with online quizzes. All these were answered for students who were looking for study assistants for homework help 2021

Reviews from Students; Verified by Trustalyze

Studyhelp247 Exceeded my expectations.

Rated 5 out of 5
2 years ago

I believe in studyhelp247 now. Here, I found the best tutor to assist me with a complex math task. It was seamless using the site.

Avatar for SdfDsf
SdfDsf

Response from Studyhelp247

Thank you for using our platform to find academic help. We are happy that you found what you were looking for.

By far, the best source of affordable custom writing solutions.

Rated 5 out of 5
2 years ago

I came to studyhelp247 after seeing an ad and they have been great. It is quite affordable owing to the fact that there are no service fee charges.

Avatar for Student01
Student01

Response from Studyhelp247

Thank you for the great review. We are committed to providing the best platform to foster student excellennce. 🙂

Very responsive support

Rated 5 out of 5
2 years ago

I have enjoyed using studyhelp247. The support was very responsive and I received quality work

Avatar for Alsalem
Alsalem

Response from Studyhelp247

Thank you.
Our support agents are always available to assist you with any issue.

Great work done for me by Anastacia.

Rated 5 out of 5
2 years ago

Thank you for the great work that you delivered. I will be back for more. 🙂

Avatar for Elsie
Elsie

Response from Studyhelp247

Thank you for using our site.

Refund Reason

Assignment Help. All November

Nov 2021 Offer

Get 50% Discount 

Happy Student - Studyhelp247

Press ENTER or click get started below to submit. 

Via Email

A Minute,

THIS YEAR, YOU EXCEL

Post Any Question for           Instant Assistance from Qualified Tutors.

 

Pay 10% Less when Hiring.

 

Get a Professional Tutor / Writer for as Low as $1