Your Perfect Assignment is Just a Click Away

We Write Custom Academic Papers

100% Original, Plagiarism Free, Customized to your instructions!


Big Data Analyst

Big Data Analyst

Big Data Analyst



1. A local retailer has a database that stores 10,000 transactions of last summer. After analyzing the data, a data science team has identified the following statistics:

• {battery} appears in 6,000 transactions.

• {sunscreen} appears in 5,000 transactions.

• {sandals} appears in 4,000 transactions.

• {bowls} appears in 2,000 transactions.

• {battery, sunscreen} appears in 1,500 transactions.

• {battery, sandals} appears in 1,000 transactions.

• {battery, bowls} appears in 250 transactions.

• {battery, sunscreen, sandals} appears in 600 transactions.


Answer the following questions:

a. What are the support values of the preceding itemsets?

b. Assuming the minimum support is 0.05, which itemsets are considered frequent?

c. What are the confidence values of {battery}->{ sunscreen} and {battery, sunscreen}->{ sandals} ? Which of the two rules is more interesting?

d. List all the candidate rules that can be formed from the statistics. Which rules are considered interesting at the minimum confidence 0.25? Out of these interesting rules, which rule is considered the most useful (that is, least coincidental)?

2. Describe how logistic regression can be used as a classifier

3. In a decision tree, how does the algorithm pick the attributes for splitting

4. A data science team is working on a classification problem in which the dataset contains many correlated variables, and most of them are continuous. The team wants the model to output the probabilities in addition to the class labels. Which classifier should the team consider using? Why?

5. Fit an appropriate ARIMA model on the following datasets included in R. Provide supporting evidence on why the fitted model was selected, and forecast the time series for 12 time periods ahead.

a. faithful: Waiting times (in minutes) between Old Faithful geyser eruptions

b. JohnsonJohnson: Quarterly earnings per J&J share

c. sunspot.month: Monthly sunspot activity from 1749 to 1997

6. Choose a topic of your interest, such as a movie, a celebrity, or any buzz word. Then collect 100 tweets related to this topic. Hand-tag them as positive, neutral, or negative. Next, split them into 80 tweets as the training set and the remaining 20 as the testing set. Run one or more classifiers over these tweets to perform sentiment analysis. What are the precision and recall of these classifiers? Which classifier performs better than the others?

Order Solution Now

Our Service Charter

1. Professional & Expert Writers: Writers Hero only hires the best. Our writers are specially selected and recruited, after which they undergo further training to perfect their skills for specialization purposes. Moreover, our writers are holders of masters and Ph.D. degrees. They have impressive academic records, besides being native English speakers.

2. Top Quality Papers: Our customers are always guaranteed papers that exceed their expectations. All our writers have +5 years of experience. This implies that all papers are written by individuals who are experts in their fields. In addition, the quality team reviews all the papers before sending them to the customers.

3. Plagiarism-Free Papers: All papers provided by Writers Hero are written from scratch. Appropriate referencing and citation of key information are followed. Plagiarism checkers are used by the Quality assurance team and our editors just to double-check that there are no instances of plagiarism.

4. Timely Delivery: Time wasted is equivalent to a failed dedication and commitment. Writers Hero is known for timely delivery of any pending customer orders. Customers are well informed of the progress of their papers to ensure they keep track of what the writer is providing before the final draft is sent for grading.

5. Affordable Prices: Our prices are fairly structured to fit all groups. Any customer willing to place their assignments with us can do so at very affordable prices. In addition, our customers enjoy regular discounts and bonuses.

6. 24/7 Customer Support: At Writers Hero, we have put in place a team of experts who answer all customer inquiries promptly. The best part is the ever-availability of the team. Customers can make inquiries anytime.