Kuehl+-+Chapter+1+Notes+-+Overheads+(06)

Kuehl+-+Chapter+1+Notes+-+Overheads+(06) - The Legacy of...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 1 - Research Design Principles 1 The Legacy of Ronald A. Fisher Section 1.1- 1.3 pp 1-5 Fairly large print is a real antidote to stiff reading. 31 May 1929, in a letter to K.Sisam, Oxford University Press. Printed in Natural Selection, Heredity, and Eugenics, p.20, J.H.Bennett, Oxford: Clarendon Press, 1983. To consult the statistician after an experiment is finished is often merely to ask him to conduct a post mortem examination. He can perhaps say what the experiment died of.” Presidential Address to the First Indian Stat Congress, 1938. “The analysis of variance is not a mathematical theorem, but rather a convenient method of arranging the arithmetic.” Discussion to ‘Statistics in agricultural research’ by J.Wishart, Journal of the Royal Statistical Society, Supplement, 1, 26-61, 1934. Three fundamental components of field trials: 1) local control for the reduction of experimental error. This was familiar. 2) replication for the estimation of experimental error. This was familiar. 3) randomization for valid estimation of experimental error. They hated this and they still do.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 1 - Research Design Principles 2 Research Hypotheses Generate Treatment Designs Section 1.4 pp 5-8 Treatments - the set of circumstances created for the experiment in response to research hypotheses. Examples are nitrogen rate to corn, diets to beef cattle, etc. Experimental Unit - the physical entity or subject exposed to the treatment independently of other units. Experimental Error - the variation among identically and independently treated experimental units. It is best thought of as the background noise, but includes. .. 1. Natural variation among experimental units. 2. Variability in measurement of the response. 3. Inability to reproduced the treatment conditions exactly from one experimental unit to another. 4. Interaction of treatments and experimental units. 5. Other extraneous factors that influence the measured characteristic.
Background image of page 2
Chapter 1 - Research Design Principles 3 Replication - the experimental unit, upon exposure to the treatment, constitutes a single replication of the experiment. Pseudo-replication or subsampling (The rats in cages problem.) Factor - a particular group of treatments. For example, temperature, moisture and soil type are all factors. Level - the categories of a factor. For example, 20, 30 and 40 C o are all levels of the temperature factor while normal, saline and sodic might be levels of the soil type factor. Quantitative Factor - the levels are ordered points on some metrical scale. For example, temperature is a quantitative factor. Qualitative Factor - the levels are distinct categories or classifications that cannot be arranged in order of magnitude. For example, soil type is a qualitative factor. Local Control of Experimental Errors Section 1.5 pp 8-16 Local control is the effort by the investigator to reduce or control experimental error, increase accuracy of observations and establish the inference base of a study. This is done by. ..
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 1 - Research Design Principles 4 1) Technique - be neat, be uniform, be a bit anal retentive.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/26/2010 for the course CPSC 540 taught by Professor Bullock,d during the Spring '08 term at University of Illinois, Urbana Champaign.

Page1 / 38

Kuehl+-+Chapter+1+Notes+-+Overheads+(06) - The Legacy of...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online