Current and upcoming readings.
The hotlinks are to electronic
copies of papers in the ISU e-library. These are free if you access
them from on campus. A few are free from off campus. Please do not
pay for access to any of these! Instead, print it out the next time
you're on campus.
Note: This page now contains only the more recent readings. The
'All readings' page has the complete list.
- Week of Apr 6
- Repeated Measures Analysis:
Littell et al., Chapter 8, especially section 8.4 on use of proc
mixed. Skim or omit the mathematical details (e.g. 3rd paragraph on
- Repeated Measures analysis using summary statistics:
Senn, Stevens, and Chaturvedi, 2000, Tutorial in Biostatistics. Repeated
measures in clinical trials: simple strategies for analysis using
summary measures. Statistics in Medicine 19:861-877. read
details on pp 861-863, 866(bottom) - 867(top), skim rest
- Repeated Measures analysis by modeling correlations:
At least one of:
1) Animal Science: Littell et all 1998.
Statistical Analysis of Repeated Measures Data Using SAS
Procedures. J. An. Sci. 76:1216-1231. Skip material on PROC GLM
and the technical appendix, unless interested. Note: the example
code in this paper omits the KR option in SAS, because the option
wasn't available in 1998.
Piepho, Buchse and Richter, 2004. A mixed modelling approach for
randomized experiments with repeated measures Read details on
pp 230-middle of 233, skim discussion (pp 243-end). Look at rest
only if really interested in lots of details.
3) Vet Med:
Grohn et al, 1999. Analysis of correlated continuous repeated
observations: modelling the effect of ketosis on milk yield in dairy
4) Nutrition: Marshall et
al. 1998. Improving power with repeated measures: diet and serum
Note: Not as thorough a description of repeated measures
modeling as in the other papers.
- Week of Apr 15: Analysis of repeated experiments (e.g. multilocation studies):
- Apr 24, 27
- Incorporating baseline information:
Roberts and Torgerson, 1999, Understanding clinical trials: Baseline
imbalance in randomized clinical trials. British Medical Journal
- ANCOVA or change scores:
Cochran 1957 Analysis of covariance: its nature and uses.
This is now the JSTOR "stable link".
To get the pdf file, you need to click the pdf button (on the right,
near the top).
Read pp 261-264, bottom of 269 and top of 270 (first part of
section 4), middle of 277 to middle of 278 (section 7). For the
rest, appreciate the value of computers.
- SAS for ANCOVA: Littell et al, Chapter 7, read sections 7.1-7.3,
skim 7.4 and 7.5, omit 7.6
- Week of Apr 27, Practical advice:
- Dyke, G. 1997. How to avoid bad statistics. Field Crops
argues for clear thinking about the experiment and its goal(s),
appropriate statistical methods, and clear presentation of the
- Riley, J. 2001. Presentation of statistical analysis.
These are the recommendations of a statistical reviewer for a major
British Agronomy journal.