Experimental Design and Analysis for Limited Resources
by Darwin H. Poritz, Ph.D., (Advanced Life Support Project, Hernandez Engineering, Johnson Space Center, Mail Stop C77, 2101 NASA Road 1, Houston, TX 77058-3696), Susan L. Steinberg, Ph.D., (Universities Space Research Association, Johnson Space Center, Mail Stop EC3, 2101 NASA Road 1, Houston, TX 77058-3696), and Daniel Haddock, (Universities Space Research Association, Johnson Space Center, Mail Stop EC3, 2101 NASA Road 1, Houston, TX 77058-3696)
pp. 421-428, (doi: http://dx.doi.org/10.1061/40722(153)59)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
Engineering, Construction, and Operations in Challenging Environments: Earth and Space 2004 |
| Abstract: |
Limited numbers of experimental units are a pervasive constraint on experiments both in microgravity and for many ground-based experiments analogous to microgravity. An experiment to compare two methods of measuring hydraulic conductivity (K) in particulate plant growth media serves as a case study for experimental design and analysis for limited resources. This case study explores balanced, optimal cross-over designs, repeated measurements, orthogonal polynomials, imputation of missing data, assessment of distributional assumptions, and tests of equivalence. |
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