Constant Error
Constant Error - Related Videos
11:23
Material Constants
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA In contrast to the production of cars or toasters, where millions of identical copies are made and extensive prototype testing is possible, each civil engineering structure is unique and very expensive to reproduce (Fig.1). Therefore, civil engineers must extensively rely on analytical modeling to design their structures. These models are simplified abstractions of reality and are used to...
01:15
Systematic Error: Methodological and Sampling Errors
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2024
In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors. Sampling errors originate from improper sampling methods or the wrong sample population. These errors can be minimized by refining the sampling strategy. Defective instruments or faulty calibrations are the sources of instrumental...
01:14
Fundamental Attribution Error
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2020
According to some social psychologists, people tend to overemphasize internal factors as explanations—or attributions—for the behavior of other people. They tend to assume that the behavior of another person is a trait of that person, and to underestimate the power of the situation on the behavior of others. They tend to fail to recognize when the behavior of another is due to situational variables, and thus to the person’s state. This erroneous assumption is called the fundamental attribution...
07:07
Errors as a Means of Reducing Impulsive Food Choice
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Cited by 7 •
2016
Giving in to temptation of tasty food may result in long-term overweight problems. This protocol describes how to reduce imprudent preference for edible commodities during hypothetical intertemporal choices in women by associating them with errors.
09:03
Spectrophotometric Determination of an Equilibrium Constant
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology The equilibrium constant, K, for a chemical system is the ratio of product concentrations to reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. Measurement of K involves determination of these concentrations for systems in chemical equilibrium. Reaction systems containing a single colored component can be studied spectrophotometrically. The relation between...
FAQs
Constant error contributes an additive offset, so changing analyte concentration does not proportionally change the discrepancy from the true value. This pattern distinguishes it from effects that vary with concentration. The fixed shift becomes especially consequential for low-level samples, where the offset represents a larger fraction of the measured amount and can strongly affect accuracy.
Repeated measurements can remain tightly grouped while all sit above or below the true value. Thus, replicate precision alone cannot establish accuracy: consistency may reflect a stable bias rather than correct measurement. In chemistry, evaluating both the spread of replicate results and their agreement with a certified reference is therefore important.
On a calibration curve, a constant offset can shift the relationship used to convert instrument response into concentration. Concentrations calculated from that curve may then inherit the bias, with the practical impact often greatest at low analyte levels. Calibration checks can reveal whether the curve or resulting values carry a persistent additive discrepancy.
A practical assessment can combine blanks, certified reference materials, replicate measurements, and calibration checks. Comparing these results helps reveal whether a persistent difference is present across the method rather than in one sample. Using several checks supports identification of an offset and provides evidence for correcting the resulting analytical values.
Potential causes should be examined at the points where a stable offset can enter the workflow. An instrument zero shift, impurity in a reagent, or persistent procedural bias can each produce the same directional discrepancy across samples. Identifying the likely source matters because correction is more reliable when linked to the cause.
Correction is most important when quantitative results must be accurate, especially for samples containing low analyte concentrations. After an offset is identified through blanks, certified reference materials, replicates, or calibration checks, chemists can correct the results to improve analytical reliability. This supports more dependable interpretation of chemical measurements.