A percentage point or percent point is the unit for the arithmetic difference between two percentages. For example, moving up from 40 percent to 44 percent is an increase of 4 percentage points (although it is a 10-percent increase in the quantity being measured, if the total amount remains the same).[1] In written text, the unit (the percentage point) is usually either written out,[2] or abbreviated as pp or p.p. to avoid confusion with percentage increase or decrease in the actual quantity. After the first occurrence, some writers abbreviate by using just "point" or "points".
Differences between percentages and percentage points
Consider the following hypothetical example: In 1980, 50 percent of the population smoked, and in 1990 only 40 percent of the population smoked. One can thus say that from 1980 to 1990, the prevalence of smoking decreased by 10 percentage points (or by 10 percent of the population) or by 20 percent when talking about smokers only – percentages indicate proportionate part of a total.
Percentage-point differences are one way to express a risk or probability. Consider a drug that cures a given disease in 70 percent of all cases, while without the drug, the disease heals spontaneously in only 50 percent of cases. The drug reduces absolute risk by 20 percentage points. Alternatives may be more meaningful to consumers of statistics, such as the reciprocal, also known as the number needed to treat (NNT). In this case, the reciprocal transform of the percentage-point difference would be 1/(20pp) = 1/0.20 = 5. Thus if 5 patients are treated with the drug, one could expect to heal one more case of the disease than would have occurred in the absence of the drug.
^Brechner, Robert (2008). Contemporary Mathematics for Business and Consumers, Brief Edition. Cengage Learning. p. 190. ISBN9781111805500. from the original on 18 May 2015. Retrieved 7 May 2015.
^Wickham, Kathleen (2003). Math Tools for Journalists. Cengage Learning. p. 30. ISBN9780972993746. from the original on 18 May 2015. Retrieved 7 May 2015.
August 01, 2023
percentage, point, percent, point, redirects, here, confused, with, percent, point, function, percentage, point, percent, point, unit, arithmetic, difference, between, percentages, example, moving, from, percent, percent, increase, percentage, points, although. Percent point redirects here Not to be confused with Percent point function A percentage point or percent point is the unit for the arithmetic difference between two percentages For example moving up from 40 percent to 44 percent is an increase of 4 percentage points although it is a 10 percent increase in the quantity being measured if the total amount remains the same 1 In written text the unit the percentage point is usually either written out 2 or abbreviated as pp or p p to avoid confusion with percentage increase or decrease in the actual quantity After the first occurrence some writers abbreviate by using just point or points Contents 1 Differences between percentages and percentage points 2 Related units 3 See also 4 ReferencesDifferences between percentages and percentage points EditConsider the following hypothetical example In 1980 50 percent of the population smoked and in 1990 only 40 percent of the population smoked One can thus say that from 1980 to 1990 the prevalence of smoking decreased by 10 percentage points or by 10 percent of the population or by 20 percent when talking about smokers only percentages indicate proportionate part of a total Percentage point differences are one way to express a risk or probability Consider a drug that cures a given disease in 70 percent of all cases while without the drug the disease heals spontaneously in only 50 percent of cases The drug reduces absolute risk by 20 percentage points Alternatives may be more meaningful to consumers of statistics such as the reciprocal also known as the number needed to treat NNT In this case the reciprocal transform of the percentage point difference would be 1 20pp 1 0 20 5 Thus if 5 patients are treated with the drug one could expect to heal one more case of the disease than would have occurred in the absence of the drug For measurements involving percentages as a unit such as growth yield or ejection fraction statistical deviations and related descriptive statistics including the standard deviation and root mean square error the result should be expressed in units of percentage points instead of percentage citation needed Mistakenly using percentage as the unit for the standard deviation is confusing since percentage is also used as a unit for the relative standard deviation i e standard deviation divided by average value coefficient of variation Related units EditPercentage 1 part in 100 Per mille 1 part in 1 000 Basis point bp difference of 1 part in 10 000 Permyriad 1 part in 10 000 Per cent mille pcm 1 part in 100 000 Baker percentageSee also EditParts per notation Per unit system Percent point function Relative change and differenceReferences Edit Brechner Robert 2008 Contemporary Mathematics for Business and Consumers Brief Edition Cengage Learning p 190 ISBN 9781111805500 Archived from the original on 18 May 2015 Retrieved 7 May 2015 Wickham Kathleen 2003 Math Tools for Journalists Cengage Learning p 30 ISBN 9780972993746 Archived from the original on 18 May 2015 Retrieved 7 May 2015 Retrieved from https en wikipedia org w index php title Percentage point amp oldid 1167544024, wikipedia, wiki, book, books, library,
