Convert Standard Error To Percentage
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Standard Error Of Percentage Formula
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Standard Deviation Percentage
can ask a question Anybody can answer The best answers are voted up and rise to the top How to express error as a percentage? up vote 5 down vote favorite 3 I have data about how many unique users do a certain thing for each day of a month. I can average it, and i would like to display the variation in a intuitive format (such
Standard Error Ratio
as % of something). Is there a standard way of doing this? I've found standard error, which is $\frac{\sigma}{\sqrt{n}}$, which is not particularly intuitive for users of the data. If anyone needs clarifications, please ask. I'm not too clear about this myself. EDIT: in response to the answers, it's for building out a analytics dashboard for use by the entire company (so many people probably don't understand standard deviation). In particular, we are doing A/B testing for various metrics over a period of say 1 month. We basically would average all the metric per day to give a number for that period, but there are variations day-to-day and would like to have some good way of expressing that. variance share|improve this question edited Jul 19 '12 at 11:20 this.is.not.a.nick 5251423 asked Feb 24 '11 at 0:05 FurtiveFelon 211136 add a comment| 6 Answers 6 active oldest votes up vote 4 down vote It may be meaningful to just divide by the average. E.g. the average number is 1000 and the std is 200, so in a sense this means the actual number can vary by 20% from the baseline. Also, if you could say who the user
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Z Score Percentage Calculator
with us Cross Validated Questions Tags Users Badges Unanswered Ask Question _ Cross Validated is a question and answer site for confidence interval percentage people interested in statistics, machine learning, data analysis, data mining, and data visualization. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The http://stats.stackexchange.com/questions/7554/how-to-express-error-as-a-percentage best answers are voted up and rise to the top Calculating standard deviation associated with percentage change [duplicate] up vote 0 down vote favorite This question already has an answer here: Standard deviation of a ratio (percentage change) 1 answer I have two data sets. The first data set, let's call it $X$ has an average value of $\bar{x}_{X}$ and standard deviation of $s_{X}$, the second data set $Y$ has an http://stats.stackexchange.com/questions/64652/calculating-standard-deviation-associated-with-percentage-change average value of $\bar{x}_{Y}$ and standard deviation of $s_{Y}$.I want to find out the standard error or standard deviation of a percentage change of data set 2 compared to 1. So I have: $$ \frac{\bar{x}_{Y}-\bar{x}_{X}}{\bar{x}_{X}}\cdot100 $$ Now my question is, how to take into account the standard deviations for this percentage value? standard-deviation share|improve this question edited Jul 17 '13 at 22:40 COOLSerdash 10.6k63154 asked Jul 17 '13 at 21:13 Chris Harrod 111 marked as duplicate by COOLSerdash, gung, Peter Flom♦, Scortchi♦, Gala Jul 18 '13 at 12:28 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. 3 Hi Chris and welcome to the site! I have a question: Are the datasets independent from each other? –COOLSerdash Jul 17 '13 at 21:31 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote You can calculate the variance for the percentage change as follows: Your problem is to calculate $\mathrm{Var}(100\cdot (Y-X)/X)$. This can be written as: $100^{2}\mathrm{Var}(Y/X)$. Now we can use the delta method to calculate the approximative variance. The delta method states that an approximation of the variance of a function $g(t)$ is given by: $$ \mathrm{Var}(g(t))\approx \
CFA Program CFA Forums CFA General Discussion CFA Level I Forum CFA Level II Forum CFA Level III Forum CFA Hook http://www.analystforum.com/forums/cfa-forums/cfa-general-discussion/91317992 Up CAIA More in CAIA CAIA Test Prep CAIA Events CAIA Links About http://onlinelibrary.wiley.com/doi/10.1002/9781444311723.oth2/pdf the CAIA Program FRM More in FRM FRM Test Prep FRM Events FRM Links About the FRM Program Careers Investments Water Cooler Test Prep Test Prep Sections CFA Test Prep CAIA Test Prep FRM Test Prep Calendar AF Deals CFA Test Prep CFA Events CFA Links About the CFA Program Home Forums standard error CFA Forums CFA General Discussion Standard Deviation expressed as % Tweet Widget Google Plus One Linkedin Share Button Facebook Like Last post PNWbroker8 Feb 5th, 2013 5:30pm CFA Level II Candidate 13 AF Points Studying With I am looking over some Morningstar material and they are using % as a proxy for risk. I assume they are talking about % Standard Deviation… can you standard error of explain the calculation for converting standard deviation to % terms, comment on why Morningstar may be using % instead of regular standard deviation, and highlight some of the pitfalls I will want to avoid when using percentage to compare the risk/return % of two portfolios. your time is appreciated - thank you for the help 5 Reasons to Use Wiley in 2016 Reason #2: No Expiration Date. You get free updates until you pass. learn more Share this Facebook Like Google Plus One Linkedin Share Button Tweet Widget bchad Feb 5th, 2013 5:46pm CFA Charterholder 15,651 AF Points Standard deviation is in the same units as the mean.  So standard deviation is the standard deviation of returns, which are expressed in percent.  What else would you want it to be?  Certainly not price, because the price - in and of itself - tells you very little (except possibly in fixed income; I’d have to think about htat). You want a quote?  Haven’t I written enough already??? PNWbroker8 Feb 5th, 2013 5:54pm CFA Level II Candidate 13 AF Points Studying With  Perhaps you care to explain the following if you have a chanceâ€
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