# STAT 406

**Welcome to Stat 406 website! Important announcements and materials will be posted on this site. Students are expected to visit it often, at least once a day. **

Announcement (Apr 11):

Announcement (Apr 11):

**Grades for Assignment 5 are available now. If you have any question, please email the TA.**

Announcement (Apr 6):

Announcement (Apr 6):

**The TA will**

**hold an office hour in RM 312 from 4:00 pm to 5:00 pm on April 6. And the lab will be in RM 301 from 1:00 pm to 2:00 pm on April 7.**

Announcement (Apr 2): Emphasize the requirements of R code once again! Your coding style will be taken into consideration. The code you submit should be EXECUTABLE at least. So please do delete any unnecessary characters, such as R prompts '>' and '+', etc. Double check your code before you submit it.

Announcement (Apr 2): Emphasize the requirements of R code once again! Your coding style will be taken into consideration. The code you submit should be EXECUTABLE at least. So please do delete any unnecessary characters, such as R prompts '>' and '+', etc. Double check your code before you submit it.

Announcement (Apr 2): R file "classify.R" has been revised.

Announcement (Apr 2): R file "classify.R" has been revised.

Announcement (Apr 1):Announcement (Apr 1):

**The TA has uploaded his codes for Assignment 5. If you find any mistake, please e-mail the TA.**

Announcement (Mar 19):Announcement (Mar 19):

**Hints for Assignment 5 is available now. Sorry for the delay. If you find any mistake, please e-mail the TA.**

Announcement (Mar 18): The second question of Problem 1 in Assignment 5 is revised. n0 and n1 are 200 instead of 40, and one more question is added.

Announcement (Mar 18): The second question of Problem 1 in Assignment 5 is revised. n0 and n1 are 200 instead of 40, and one more question is added.

Announcement (Mar 16): Assignment 5 is available now. If you find any mistake, please e-mail the TA.

Announcement (Mar 16): Assignment 5 is available now. If you find any mistake, please e-mail the TA.

Announcement (Mar 16): Grades for Assignment 4 are available now; so is a brief review.

Announcement (Mar 16): Grades for Assignment 4 are available now; so is a brief review.

Announcement (Mar 12): Midterm Exam along with solutions has been uploaded.

Announcement (Mar 12): Midterm Exam along with solutions has been uploaded.

Announcement (Mar 11): Hints for Assignment 4 has been revised since many of you did not go to the lab last week and therefore missed some hints on Question (c), Problem 2. Take a look if you want to.

Announcement (Mar 11): Hints for Assignment 4 has been revised since many of you did not go to the lab last week and therefore missed some hints on Question (c), Problem 2. Take a look if you want to.

Announcement (Mar 9): There is a mistake in Question (b), Problem 1, Assignment 4. In the definition of robust residuals, MAD should not be square rooted. Corrected version of Assignment 4 is updated.

Announcement (Mar 9): There is a mistake in Question (b), Problem 1, Assignment 4. In the definition of robust residuals, MAD should not be square rooted. Corrected version of Assignment 4 is updated.

Announcement (Mar 9): Grades for midterm exam are available now.

Announcement (Mar 9): Grades for midterm exam are available now.

Announcement (Mar 9):Announcement (Mar 9):

**Grades for Assignment 3 are available now, and a brief review will be posted later.**

Announcement (Mar 6):Announcement (Mar 6):

**Hints for Assignment 4 is available now. Sorry for the delay. If you find any mistake, please e-mail the TA.**

Announcement (Mar 4):Announcement (Mar 4):

**Assignment 4 is available now. If you find any mistake, please e-mail the TA.**

**Announcement (Mar 2): ****R codes for Assignment 3 by the TA have been uploaded. If you find any mistake, please e-mail the TA.**

**Announcement (Feb 28):****There are three mistakes in "Hints for midterm practice".**

(1) In Problem 2, the conditional expectation of Y should be 2/3, not -1/3.

(2) In Question (iii), Problem 3, the confidence interval should be [17.27, 27.02].

(5) In the R code for Problem 5, the definition of function chi() should be ifelse( abs( y ) <= d, ( y / d )^2, 1 ).

The corrected version has been uploaded. Sorry for the mistakes.

(1) In Problem 2, the conditional expectation of Y should be 2/3, not -1/3.

(2) In Question (iii), Problem 3, the confidence interval should be [17.27, 27.02].

(5) In the R code for Problem 5, the definition of function chi() should be ifelse( abs( y ) <= d, ( y / d )^2, 1 ).

The corrected version has been uploaded. Sorry for the mistakes.

**Announcement (Feb 27): ****Hints for midterm practice is available now. If you find any mistake, please e-mail the TA.**

**Announcement (Feb 27): ****The TA will hold a temp office hour before the midterm exam. It is in RM 312, LSK Building, from 1:00 pm to 2:00 pm on Mar. 3 only.**

**Announcement (Feb 26): ****In function seq(), the argument indicating the step is by but not step. Sorry for the mistake.**

**Announcement (Feb 25): ****Hints for Assignment 3 has been updated.**

**Announcement (Feb 25): ****(i) several typos have been corrected in the "Robustness" handout. (ii) Aissignment 3 is due on Monday, March 2, in class (instead of Firday, Feb 27, as initially scheduled). **

**Announcement (Feb 22): ****An independence assumption has been added to the definition of k in Problem 3, Assignment 3. New version has been updated.**

**Announcement (Feb 21): ****Question (c) and (d) in Problem 3, Assignment 3 have been modified. New version has been updated.**

**Announcement (Feb 21): ****A review of Assignment 2 has been uploaded.**

**Announcement (Feb 20): A practice of midterm exam has been posted. Please take a look.**

**Announcement (Feb 19): **** Grades of Assignment 2 are available now.**

**Announcement (Feb 18): ****There is a typo in the definition of k in Problem 3, Assignment 3. New version has been updated.**

**Announcement (Feb 16): ****Hints for Assignment 3 is available in the directory LABs now. Please take a look at it since we don't have a lab this week.**

**Announcement (Feb 16): ****Assignment 3 is fully available now. If you find any typos or mistakes, please e-mail the TA. Hints for Assignment 3 will be posted later.**

**Announcement (Feb 11): **** The TA made a mistake in the lab. Please go to LABs and check that out. Sorry.**

**Announcement (Feb 4): ****There is a typo in Assignment 2, Problem 2 Part (c). You are required to construct a CI for the parameter mu but not for the sample trimmed mean. The corrected version of Assignment 2 has been posted.**

**Announcement (Feb 2): **** Grades of Assignment 1 are available now.**

**Announcement (Feb 1): ****Assignment 2 is fully available now. If you find any typos or mistakes, please e-mail the TA. **

**Announcement (Jan 28): ****The first two problems in Assignment 2 are available now. If you find any typos or mistakes, please e-mail the TA. **

**Announcement (Jan 17): ****The note for Lab 1 has been updated. Please refer to it for hints and requirements to Assignment 1. **

**Announcement (Jan 5): **** Labs will begin in the second week of classes. There will not be labs in the first weeks. **