## Announcements

New! Homework 4.

New! Quiz 4.

New! Practice problem 4 solutions posted in the usual place: under the Solutions link in the navigation to the left.

New! Homework 3 solutions posted in the usual place: under the Solutions link in the navigation to the left. (I seem to have forgotten to post them earlier.)

New! Practice problems 4 posted in the usual place: under the Practice Problems link in the navigation to the left.

Grade distributions posted for quizzes 1, 2, 3, and homeworks 1, 2 (under Grade Distributions in the navigation to the left).

We noticed during class that the function being written in Section 8 of the course notes on computer arithmetic was missing

stopifnot(0 <= x)It has been added now in the final version in Section 8.9.

I told a student in office hours about talk to the bear. This is just a reminder to tell the story to the whole class.

New section added to the handout on arrays, the second half of
the section about using apply with functions that return vectors explains that
sometimes `apply`

produces a matrix that is the transpose of
what you think it *ought* to produce.

There was an error on the statement of practice problem 2.2:
`y`_{d − i}
should have been
`y`_{d + 1 − i}.
Now fixed.

New plan for office hours. Office hours on Monday are the same as before. Office hours on Wednesday are the same as before (the two class periods after our class) on days when homework is due. Office hours on Wednesday are changed to the two class periods before our class on days when we have quizzes starting Feb 15.

Solutions to the practice problems 2 revised and re-posted about noon, Tuesday, Feb 14 under Solutions in the navigation to the left. (The solution to problem 4 was modified to match the hint.) Requires user name and password sent in e-mail to the class. Do not look at them before you have done your own solutions. Otherwise, they will not help you.

The link formerly called Homework Solutions

in the navigation
to the left is now just called Solutions,
because all solutions will be in there (the quiz solutions are just the
first part of the homework solutions, but now solutions to practice
problems are going in there too).
Still requires user name and password sent in e-mail to the class.

Solutions to Quiz 1 and Homework 1 posted (under Solutions in the navigation to the left). Requires user name and password sent in e-mail to the class.

New idea (requested by several students). New section Practice Problems. Contains some practice problems that may or may not be helpful on the next quiz.

A very interesting
talk by Martin Mächler (who is on the R core team), which is not
required viewing for the class, just interesting. It is titled
*Seven guidelines for good practices in R programming*,
and the guidelines are

- Work with source files!
- Keep R source well-readable & maintainable
- Do read the documentation
- Do learn from the masters
- Do not Copy & Paste!
- Strive for clarity and simplicity
- Test your code

`<-`

rather than `=`

for assignment in R.
New!
The General Info page (linked in the navigation
to the left) is now complete. It constitutes the course syllabus

.
New sections, are quiz and homework dates, rules, and grading weights.

We are supposed to announce this.

The 4+1 Biostatistics MS program is designed specifically for undergraduate students who are currently enrolled in the School of Statistics in the U of MN College of Liberal Arts (CLA), providing them a unique opportunity to complete a bachelor's and master's degree within five years.

Students fulfill all CLA undergraduate requirements as determined by their program and begin graduate coursework in Biostatistics during their fourth year. Biostatistics graduate courses and the corresponding MS degree are administered by the U of MN School of Public Health.

For more information see http://www.sph.umn.edu/academics/programs/4-1/biostatistics/.

There is an Informational Pizza Lunch, Tuesday February 14th from noon to 1pm, Ford Hall — Room 300

Course Notes link (in the navigation to the left) works. The first handout is there.

Many links are still broken.

## Quizzes

Quiz | Date |
---|---|

Quiz 1 | Wednesday, Feb 1 |

Quiz 2 | Wednesday, Feb 15 |

Quiz 3 | Wednesday, Mar 1 |

spring break | |

Quiz 4 | Wednesday, Mar 22 |

Quiz 5 | Wednesday, Apr 5 |

Quiz 6 | Wednesday, Apr 19. |

Quiz 7 | Wednesday, May 3 |

There will be no final exam. All quizzes are in the usual classroom at the usual class time.