coursera r programming week 4 assignment

R programming Assignment 3 week 4

Course 2 r programming, assignment 3 (week 4), under data science by johns hopkins university, 1 plot the 30-day mortality rates for heart attack, 3 ranking hospitals by outcome in a state, 4 ranking hospitals in all states.

Week 4 Quiz >> R Programming

1. What is produced at the end of this snippet of R code?

• A vector with the numbers 1, 4, 1, 1, 5
• A vector with the numbers 1, 1, 2, 4, 1
• It is impossible to tell because the result is random
• A vector with the numbers 3.3, 2.5, 0.5, 1.1, 1.7

2. What R function can be used to generate standard Normal random variables?

3. When simulating data, why is using the set.seed() function important? Select all that apply.

• It can be used to specify which random number generating algorithm R should use, ensuring consistency and reproducibility.
• It can be used to generate non-uniform random numbers.
• It ensures that the sequence of random numbers is truly random.
• It ensures that the random numbers generated are within specified boundaries.

4. Which function can be used to evaluate the inverse cumulative distribution function for the Poisson distribution?

5. What does the following code do?

• Generate data from a Normal linear model
• Generate data from a Poisson generalized linear model
• Generate random exponentially distributed data
• Generate uniformly distributed random data

6. What R function can be used to generate Binomial random variables?

7. What aspect of the R runtime does the profiler keep track of when an R expression is evaluated?

• the package search list
• the function call stack
• the working directory
• the global environment

8. Consider the following R code

(Assume that y, x1, and x2 are present in the workspace.) Without running the code, what percentage of the run time is spent in the ‘lm’ function, based on the ‘by.total’ method of normalization shown in ‘summaryRprof()’?

• It is not possible to tell

9. When using ‘system.time()’, what is the user time?

• It is the “wall-clock” time it takes to evaluate an expression
• It is a measure of network latency
• It is the time spent by the CPU waiting for other tasks to finish
• It is the time spent by the CPU evaluating an expression

10. If a computer has more than one available processor and R is able to take advantage of that, then which of the following is true when using ‘system.time()’?

• user time is 0
• elapsed time may be smaller than user time
• user time is always smaller than elapsed time
• elapsed time is 0

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R Programming Project 1

github repo for rest of specialization: Data Science Coursera

For this first programming assignment you will write three functions that are meant to interact with dataset that accompanies this assignment. The dataset is contained in a zip file specdata.zip that you can download from the Coursera web site.

Although this is a programming assignment, you will be assessed using a separate quiz.

The zip file containing the data can be downloaded here: specdata.zip [2.4MB] Description: The zip file contains 332 comma-separated-value (CSV) files containing pollution monitoring data.

Part 1 ( pollutantmean.R )

Part 2 ( complete.r ), part 3 ( corr.r ).

SUSANKI commented Jul 30, 2020

Thank u so much, It's a little bit complicated for me @-@

Sorry, something went wrong.

Cyberclip commented Sep 14, 2020

Here it says when I try to do part 1 that there's no package named 'data.table', what should I do?

harshit229 commented Oct 7, 2020

use rstudio

Romeroc3 commented Dec 27, 2020 • edited

Thank you very much for this assignment information. I am currently doing my case study on the refugee situation and I need to study data science to analyze the data. Interestingly, the idea for the research came spontaneously when I read https://samplius.com/free-essay-examples/refugee/ in preparation for lesson. These free essay examples got me interested more in migration and globalization issue. Therefore, I decided to do a little research, but I lack the skills to do a high-quality analysis of big data.

kennethwoanyah commented Feb 3, 2021

@SUSANKI yep, complicated for me too . lol. Works perfectly though.

flaviaouyang commented Feb 18, 2021

you need to install the package. install.packages(data.table)

Bell-016 commented Feb 23, 2021

I am very frustrated with this course. I took it assuming it will explain things from the beggining for a beginner, but the first assignment to me is unreadble, I would never give this answer because I felt I never learn this things you used for your answer.

utamadonny commented Mar 16, 2022

i run the corr.R and it return "Error in eval(bysub, parent.frame(), parent.frame()) : object 'ID' not found"

Rushield commented Apr 9, 2022

Bruh this course is just annoying because it ain't show us how to do those things, even understanding your simplified code in a week 2 is damn hard.

emcdowell28 commented Dec 15, 2022

You and me both. I've been using multiple other online textbooks to try and gain any kind of fundamental understanding of this material. I don't usually struggle with things like this, but nothing makes me feel more unintelligent than being tested over things we haven't even been taught yet.

Help Articles

Programming assignments, learner help center dec 5, 2022 • knowledge, article details.

Programming assignments require you to write and run a computer program to solve a problem.

Some programming assignments count toward your final course grade, while others are just for practice.

Sections of a programming assignment

Programming assignments include both assignment instructions and assignment parts.

Assignment instructions:

• Explain the assignment.
• May include a link to a downloadable starter package that includes starter code, detailed guidelines, and other resources.

Assignment parts:

• Are similar to individual questions within a quiz.
• Are each a single coding task.
• Are each worth a certain number of points toward the overall assignment score.
• Can be completed and submitted all at once, or one at a time.

Programming assignment grades

Programming assignments are graded automatically.

Some are graded using a built-in grading algorithm that compares your program's output to a value specified by your instructor. Others are graded using a custom grading algorithm created by your instructor.

If a programming assignment uses built-in grading:

• Your code will run locally on your computer, and the output will be sent to Coursera's servers.
• Your grade will be based on comparison against numeric or regular expression grading logic.
• You'll get your grade a few seconds after submitting.

If a programming assignment uses custom grading:

• Your code will be run on Coursera's servers.
• Your grade will be based on custom logic provided by your instructor.
• You'll get your grade within an hour of submitting.
• You'll need to refresh the page to see your grade.

Submit a programming assignment

To submit a programming assignment:

• Open the assignment page for the assignment you want to submit.
• Read the assignment instructions and download any starter files.
• Finish the coding tasks in your local coding environment. Check the starter files and instructions when you need to.
• If the assignment uses script submission , submit your assignment by running the submission script in your local coding environment and entering the submission token.
• If the assignment uses web submission , upload your files using the instructions on your screen.

Test a programming assignment

Some programming assignments let you test them before you submit them to get feedback on whether they run. You won't get grades or feedback from the instructor until you submit the assignment.

Edit or resubmit a programming assignment

You can resubmit a programming assignment if you don't pass on the first attempt or want to improve your score. You might have to wait a certain amount of time between attempts.

To resubmit a programming assignment, follow the same steps for submitting one. If your assignment uses script submission, you'll need to select the Generate new token option on the assignment page and use the new submission token.

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• Coursera Statistical Inference - Week 4 Assignment Part 1
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