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Percent Error Difference Equation

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a percentage of one (or both) values Use Percentage Change when comparing an Old Value to a New Value Use Percentage Error when comparing an Approximate Value percent difference formula to an Exact Value Use Percentage Difference when both values mean the percent difference physics same kind of thing (one value is not obviously older or better than the other). (Refer to those percent difference chemistry links for more details) How to Calculate Step 1: Subtract one value from the other Step 2: Then divide by ... what? Percentage Change: Divide by the Old Value Percentage

Percent Difference Definition

Error: Divide by the Exact Value Percentage Difference: Divide by the Average of The Two Values Step 3: Is the answer negative? Percentage Change: a positive value is an increase, a negative value is a decrease. Percentage Error: ignore a minus sign (just leave it off), unless you want to know if the error is under or over the exact value percent error formula Percentage Difference: ignore a minus sign, because neither value is more important, so being "above" or "below" does not make sense. Step 4: Convert this into a percentage (multiply by 100 and add a % sign) The Formulas (Note: the "|" symbols mean absolute value, so negatives become positive.) Percent Change = New Value - Old Value × 100% |Old Value| Example: There were 200 customers yesterday, and 240 today: 240 - 200 × 100% = (40/200) × 100% = 20% |200| A 20% increase. Percent Error = |Approximate Value - Exact Value| × 100% |Exact Value| Example: I thought 70 people would turn up to the concert, but in fact 80 did! |70 - 80| × 100% = (10/80) × 100% = 12.5% |80| I was in error by 12.5% (Without using the absolute value, the error is -12.5%, meaning I under-estimated the value) Percentage Difference = | First Value - Second Value | × 100% (First Value + Second Value)/2 Example: "Best Shoes" g

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Percent Error Chemistry

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Percent Difference Physics Lab

Images into Rspec Measuring Magnitude in Maxim Observing with Rigel Photometry in Maxim Producing Color Images Stacking Images Using SpectraSuite Software Using Tablet Applications Using the Rise and Set Calculator http://www.mathsisfun.com/data/percentage-difference-vs-error.html on Rigel Wavelength Calibration in Rspec Glossary Kepler's Third Law Significant Figures Percent Error Formula Small-Angle Formula Stellar Parallax Finder Chart Iowa Robotic Telescope Sidebar[Skip] Glossary Index Kepler's Third LawSignificant FiguresPercent Error FormulaSmall-Angle FormulaStellar ParallaxFinder Chart Percent Error Formula When you calculate results that are aiming for known values, the percent error formula is useful tool for determining the http://astro.physics.uiowa.edu/ITU/glossary/percent-error-formula/ precision of your calculations.  The formula is given by: The experimental value is your calculated value, and the theoretical value is your known value.  A percentage very close to zero means you are very close to your targeted value, which is good.  It is always necessary to understand the cause of the error, such as whether it is due to the imprecision of your equipment, your own estimations, or a mistake in your experiment.Example:  The 17th century Danish astronomer, Ole Rømer, observed that the periods of the satellites of Jupiter would appear to fluctuate depending on the distance of Jupiter from Earth.  The further away Jupiter was, the longer the satellites would take to appear from behind the planet.  In 1676, he determined that this phenomenon was due to the fact that the speed of light was finite, and subsequently estimated its velocity to be approximately 220,000 km/s.  The current accepted value of the speed of light is almost 299,800 km/s.  What was the percent error of Rømer's estimate?Solution:experimental value = 220,000 km/s = 2.2 x 108 m/stheore

as the value of p or the acceleration due to earth's gravity, g. Since http://mathcentral.uregina.ca/qq/database/qq.09.06/s/carolyn1.html these quantities have accepted or true values, we can calculate the percent error between our measurement percent difference of the value and the accepted value with the formula Sometimes, we will compare the results of two measurements of the same quantity. For instance, we may use two different methods to determine percent difference physics the speed of a rolling body. In this case, since there is not one accepted value for the speed of a rolling body, we will use the percent difference to determine the similarity of the measurements. This is found by dividing the absolute difference of the two measured values by their average, or Physics Lab Tutorials If you have a question or comment, send an e-mail to Lab Coordinator: Jerry Hester Copyright © 2006. Clemson University. All Rights Reserved. Photo's Courtesy Corel Draw. Last Modified on 01/27/2006 14:25:18.

the absolute value of the difference between the two numbers, divided by the average of those two numbers, multiplied by 100%. That is therefore % difference = (approximately) 13.1%. Notice that the (211373 - 185420) term is the difference between the two numbers, and the (211373 + 185420)/2 term is the average of the two numbers. This gives us a decimal that we then need to multiply by 100% to turn it into a percentage. % difference is similar to but distinct from "% error ". % difference is used (for example) when comparing two independent measurements of the same quantity to find out how much the measurements differ. % error is used (for example) when comparing a single measurement of a quantity to the theoretical or "currently accepted" value of that quantity. In the case of % error , we would replace the average of the two terms in the denominator by the currently accepted value. Hope this helps! Gabriel. Hi Carolyn. I want to add a note to Gabe's response. Percentage difference, percentage error and percentage change all ask for the difference of two numbers as a percentage of something. This phrase "of something" is always something we should think about when we talk about percentage. We should always ask "percentage of what?" For percentage error where we know the actual value or the currently accepted value then we take the difference between the measurement and the actual value as a percentage of the actual value. This is what Gabe did. For percentage change there is time involved. First you take a measurement and later you take a second measurement. You then evaluate the difference and represent this difference as a percentage of the starting value. So in particular if you had said that the value changed from 211373 to 185420 then the change is 185420 - 211373 = -25953. As a percentage of the starting value this is -25953/211373 * 100 = -12.28%. Since this is negative I could say there is a 12.28% decrease. For percentage difference as in your question I agree with Gabe that you you should take the absolute value of the difference as a percentage of the average of the two values. Penny. Hi Carolyn. Gabriel (the person who answered your question first) is a physicist. The term percent difference between two numbers doesn't have a really specific mathematical meaning, so hopefully the context you are using this for is the physical sciences. Often, people are confused about percentages. Really, all they are is fractions (per-cent means per hundred, so 100 is the denominator: 13.1% = 13.

 

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