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A Student’s Guide to Data and Error Analysis. All students taking laboratory courses within the physical sciences engineering will benefit from this book, whilst researchers will find invaluable reference. This concise, practical guide brings the reader speed on the proper handling and presentation of scientific data and its curacies.
A comprehensive package of statistical tools (simple, cross-sectional, and gitudinal) required in laboratory experimentation. A solid introduction to the terminology used in many applications the interpretation of assay design and validation as well as “fit-for-purpose” procedures.
USES OF UNCERTAINTY ANALYSIS (I) • Assess experimental procedure including identification of potential difficulties. – Definition of necessary steps. – Gaps. • Advise what procedures need to be put in place for measurement. • Identify instruments and procedures that control accuracy and precision.
ANALYSIS - Analyze lab data by quantifying error. Learning Objectives. You should be able to. Explain how error propagates or compounds in computations involving random variables. Use a rule of thumb to estimate the error in computed results. Calculate the error in a result computed using products or quotients.
- Accuracy
- Precision
- Resolution
Accuracy is quantified as the difference between a true value and an observed value. Accuracy quantifies the bias in a measure caused by measurement error. High accuracy would be a measure with a small deviation from the true value, and low accuracy would be a measure a large deviation from the true value. Accuracy is quantified by measuring the de...
If a system measures something multiple times, then the results should be invariant; any deviations in the measured values would indicate lack of precision. Therefore precision is the difference between an observed and an expected mean value. To illustrate the quantification of precision, consider the data in Table 11.2. Precision of these measures...
Resolution is the “fineness” with which a measure can be made. It reflects for any measurement instrument the limit on the measured quantity which produces a change in the output of the instrument. For data collection equipment, resolution is expressed as a value or percentage of the instruments full measuring range. For example, for a force plate ...
When we record data in the laboratory, our task is to provide a quantitative estimate of the uncertainties in our measurements. This task divides into two parts: first, we estimate the errors on directly measured
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How to analyze lab data by quantifying error?
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Learning Goals. Understand how to measure error in a lab experiment. Study how to propagate error from an initial measurement through a calcu- lation. Understand how uncertainty is an integral part of any lab experiment. Introduction. There is no such thing as a perfect measurement.
