week 4:

Question 1

Question 1
 This is java programming build a recommendation system week 4 quiz answers. You will not need any other answers to solve this java programming questions.
First, You need to know about this java programming course that make you good in learning how to build a recommendation system.
   introduction...
Ever wonder how Netflix decides what movies to recommend for you? Or how Amazon recommends books? We can get a feel for how it works by building a simplified recommender of our own!
In this capstone, you will show off your problem solving and Java programming skills by creating recommender systems. You will work with data for movies, including ratings, but the principles involved can easily be adapted to books, restaurants, and more. You will write a program to answer questions about the data, including which items should be recommended to a user based on their ratings of several movies. Given input files on users ratings and movie titles, You will be able to make filtering to the movies or any data to make perfect recommender system, not movies only you can do music or literally any data...
You have many recommendations languages to help to code with it but java programing is the most used to do this, it has many algorithm theories making this easer. build a systems for recommendation is very known with java programming.
   
java programing build a recommendation system graded quiz answers..
  1.In the class FourthRatings, which one of the following is a correct replacement for the line 
for (Rater r: myRaters){
that came from the file ThirdRatings but now should use the RaterDatabase class. 
  the answer is here:
      for (Rater r: RaterDatabase.getRaters()){


 
Question 2
  2.In the method printAverageRatings in the Class MovieRunnerSimilarRatings, assume the name of the FourthRatings object is named runner. Which one of the following is a correct way to print out the number of raters in the RaterDatabase?
  the answer is here:
     
      System.out.println("read data for" + RaterDatabase.size() + "raters");


  
Question 3
  3.Consider that the following ratings exist
Rater ID      MovieID      Rating
15            2354         10
15            3285         6
15            1297         2
15            5804         8
20            3285         4
20            1297         7
20            6574         10
20            2354         9
Consider the method dotProduct in the FourthRatings class. What should the call dotProduct(“15”, “20”)  return?
  the answer is here:       
      128

   
Question 4
4.Consider that the following ratings exist
RaterID     MovieID     Rating
15          2354        10
15          3285        6
15          1297        2
15          5804        8
20          3285        4
20          1297        7
20          6574        10
20          2354        9
For rater 30, we have calculated similarity ratings with these two raters:
RaterID,   Similarity with Rater 30
15,        7.0
20,        30.0
Assuming these are the only raters who rated movie 3285, what is the weighted average rating for the movie with ID 3285?  
Question 4
  the answer is here:
            81


Question 5
   5.Which one of the following statements is true about the FourthRatings class where the changes suggested are the only changes made and the program works as it did before after the change?
  the answer is here:           
            The method getSimilarRatings can be written with just one line of code that returns the result  of a call to getSimilarRatingsByFilter.

  


Question 6
  6.Run the printSimilarRatings method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 337, the number of minimal raters to 3 and the number of top similar raters set to 10. What is the movie with the top rated average?
  the answer is here:   
      Frozen


Question 7
  7.Run the printSimilarRatingsByGenre method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 964, the genre “Mystery”, the number of minimal raters to 5 and the number of top similar raters set to 20. What is the movie with the top rated average?
  the answer is here:
     Gone Girl


Question 8
  8.Run the printSimilarRatings method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 71, the number of minimal raters to 5 and the number of top similar raters set to 20. What is the movie with the top rated average?
  the answer is here:
      About Time


Question 9
  9.Run the printSimilarRatingsByDirector method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 120, the directors  “Clint Eastwood,J.J. Abrams,Alfred Hitchcock,Sydney Pollack,David Cronenberg,Oliver Stone,Mike Leigh”, the number of minimal raters to 2 and the number of top similar raters set to 10. What is the movie with the top rated average?
  the answer is here:
      Star Trek


Question 10
  10.Run the printSimilarRatingsByGenreAndMinutes method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 168, the genre Drama, the length of the movie between 80 and 160 inclusive,  the number of minimal raters to 3 and the number of top similar raters set to 10. What is the movie with the top rated average?
  the answer is here:
       The Imitation


Question 11
  11.Run the printSimilarRatingsByYearAfterAndMinutes method in the MovieRunnerSimilarRatings class  using the files ratedmoviesfull.csv and ratings.csv and the rater id 314, the year 1975, the length of the movie between 70 and 200 inclusive,  the number of minimal raters to 5 and the number of top similar raters set to 10. What is the movie with the top rated average?
  the answer is here:  
      Nightcrawler


cited for generate and engine building collaborative machine, using software programming techniques.
this course show you skills you need to solve any problem in programing language with some algorithms, by example doing a recommendation system for music, movies any way.  and with this course you will also be able to:

1. Read in and parse data into lists and maps.
2. Calculate average ratings.
3. Calculate how similar a given rater is to another user based on ratings. 
4. Recommend movies to a given user based on ratings. 
5. Display recommended movies for a given user on a webpage.

  some task  you will learn to solve anther time graph needed to wright with coding. anther courses help you explore high level tools to make development and help any web site developed  by adding new features. and computer science is very enjoyable capturing various information, it's like university to you help you practice getting natural job. you can look or search about java programing, and you can choose to start today or not developing android, but you have to make correct decision  and discover projects (written specialization, designed content), end.

  