Terminology Experimental Design (II) - Plant & Soil Sciences ELibrary

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• Lesson: Introduction to Experimental Design
• PART 1: Introduction + Experimental Design
• Current: page 6: Terminology Experimental Design (II)

Terminology Experimental Design (II)

In terms of the experiment, we need to define the following:

Treatment: is what we want to compare in the experiment. It can consist of the levels of a single factor, a combination of levels of more than one factor, or of different quantities of an explanatory variable.

Experimental unit: is the physical unit that receives a particular treatment, for example, a plot in the field. It is essential that the allocation of a treatment to a particular experimental unit is at random.

Measurement unit: the level at which observations are made, usually one measurement per experimental unit, but it is possible to make more than one observation within a single experimental unit (repeated measures).

Replication: is the number of independent instances of a treatment that occur within an experiment i.e. several experimental units receive the same treatment.

Block: is a group of experimental units that show some similarity/homogeneity between each other. Random allocation of treatments to units within blocks reduces experimental error.

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• Lesson home
• Experimental Design
• PART 1: Introduction + Experimental Design
  • Introduction to STATISTICS
  • Intro to Statistics
  • Components of an Experiment/ Terminology Experimental Design (I)
  • Terminology Experimental Design (II) you are here.
  • Main Principles of experimental design: the 3 “R’s”
  • Experimental studies
  • An experiment with insecticides
  • Randomization using GenStat
  • From the field to the data file
• PART 2: STATISTICAL MODEL AND ANALYSIS
  • PART 2 Analysis of Variance
  • Part 2: Statistical Analysis and Modeling
  • Assumptions of Tukey's test
  • The one-way ANOVA model
  • The research question and the one-way ANOVA model
  • Parameter estimation
  • Partition of Sums of Squares in ANOVA (I)
  • Partition of Sums of Squares in ANOVA (II)
  • ANOVA table and hypothesis testing
  • ANOVA table insecticide example
  • Check model assumptions
  • After the F-test: pairwise comparisons
  • Mean comparisons: insecticides example
  • Fisher’s protected LSD: insecticides example
  • Multiple comparisons
  • Fisher’s LSD versus Tukey’s LSD
• Part 3: Quiz Questions
  • Quiz
  • Quiz
  • Quiz
  • Quiz

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