Statistics 401 Section F

Fall 2007

Computing

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Stat 401 Section F Home Page
Petrutza Caragea's Home Page

A collection of useful commands in R can be found here: R reference card

Monday, August 20

A simple introduction to using R
Data sets for Lab 1
- height.txt
- height_gender.txt
- 4set_data.txt (needed for Homework 1)

Monday, August 27

Data sets for Lab 2
- 100 boxes data
- Lab2Sampling.r contains an R function which we can use to draw repeated samples from the population of interest.
Rough outline of commands discussed during Lab 2
Instructions on how to label a side-by-side boxplot graph

Wednesday, September 5

steers.txt (needed for Problem 1 in Homework 3)
sparrow.txt (needed for Problem 3 in Homework 3)

Monday, September 10

A short Introduction to SAS (a first example, explained in Lab 3; proc print and proc univariate)
A second example using the data for the 100 boxes problem (proc means)
A third example for the trees matched pair experiment discussed in class (calculating differences and proc means)
The SAS code for a two-sample t-test: sparrow.sas (proc ttest)

Wednesday, September 12

california.sas (needed for Problem 2 in Homework 4)
sunscreen.sas (needed for Problem 3 in Homework 4)

Wednesday, September 19

Mutant.txt (needed for Problem 1 in Homework 5)

Friday, September 28

Data set (doughnut.txt) and the SAS code (doughnut.sas) used in class to illustrate One Way Analysis of Variance (F test and table)

Wednesday, October 10

R function to compute residual sums of squares RSS.r and an illustration of its usage on the doughnut data set used in class: doughnut_RSS.r. This is a very useful program for the last problem on HW7.

Monday, October 15

Data set (crab.txt), the SAS code (crab.sas) and the output from SAS and the R code (crab.r) used to discuss ANOVA assumptions.
Data set (chicken.txt), the SAS code (chicken.sas) and the output from SAS used to discuss multiple comparisons.

Wednesday, October 17

SAS code manatee.sas to compute the linear correlation coefficient and the simple linear regression coefficients (used in HW#8)

Friday, October 19

SAS code ustemps.sas for correlation and linear regression line for US temperature data (here is what your output should look like: ustemps.pdf)
Data set (UStemp.txt) and R code (UStemp.r) to calculate regression coefficient, estimate SLR line and plot a scatter plot with several symbols

Monday, October 22

Black wheateaters example regarding estimation and inference for SLR (covered in Lab)

Wednesday, October 24

Data set wine.txt useful for HW9

Wednesday, October 31

Data sets meatproc.txt, bear.txt and bfchange.txt needed for HW10 as well as meatproc.sas. Useful code for prediction and inference for simple linear regression in R is cyclone.r(very easy to adapt for multiple linear regression)

Wednesday, November 14

SAS code (sat.sas) used for the problem on SAT scores discussed in class (useful for variable selection)
Data set Mortality.txt used in HW11