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Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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Appropriate analysis for univariate proportion data and environmental variables

I'm new to statistics so am trying to choose the best analysis to find if; There is a difference between canopy cover (0-100%) at different sites There is a relationship between canopy cover and ...
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6 views

percent change from baseline

i have a 10 samples with baseline and follow up scores. I need to calculate a percentage increase or decrease based on the scoring scale, in this case its 0-56, and the objective (whether the ...
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1answer
20 views

Statistic to measure no.of cancelled members

These percentages indicate how many male vs female members cancelled a subscription we offer. Male Female 22% 13% Looking at the ...
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8 views

How to create a scale combining normalized percentile scores to get an overall result

I am trying to work out a scale for assessing a person’s risk for a particular behavior (like rob a bank). The likelihood of this behavior occurring or not occurring will be based on scores for a ...
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22 views

How do I convert a survey scale [7-point, -3 to 3] to a 7-point scale [1-7]?

I am working with a survey scale that is from -3 to 3. I have a mean value of .94 and I want to identify if there are ceiling effects, but I need to change the entire scale to 1-7 in order to ...
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18 views

Interaction effects for independent variables in percentages

If the Independent variables are in percentages, then will it make sense to calculate interaction effects using the original figures? or do I need to make any changes?
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1answer
15 views

Regression equation using percentage values in R : Request your help for a beginner

Can percentage values be independant variables? Can I use then as it is, or do I need to take log. And also if I have to consider interaction effects when independent variables are percentages, how ...
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1answer
25 views

Comparing percentages based on likert scale by year

I'm reviewing an analysis someone else has done on some Likert scale data. They've assigned each point on the scale 1-5 (1 = bad, 2 = poor etc.), found the average score in each area, and then ...
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44 views

Modelling percentage and proportion data with GLM's [duplicate]

I would like a simple answer, if there is one, to a question I cannot seem to find on here. What is the best way to model percentages? Say I have a glass that is empty and I fill it with liquid ...
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Average percentages [duplicate]

Hi I am trying to average percentages but what each percentage represents is not equal. The 5 numbers are : 100%, 0%, 0%, 20%, 75% 100% represents 4 items 20% represents 10 items 75% ...
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1answer
60 views

Modelling a percentge as a dependent variable

I have a dataset containing 4 variables: Y - the dependent variable. This is a percentage of students in a school that choose to take an external exam. The values vary from 20% to 70%. X - the ...
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1answer
25 views

Is it reasonable to display “percentage data” in a boxplot, why?

I have data that are in fact percentages of C (bound to clay) combusted in a certain temperature interval. Exemplary data: ...
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What model should I use if I want to describe the relationship between the % and binary outcome

I want to model a relationship between the % of students who received a flu vaccine at a certain school and whether their school had a flu outbreak or not. Thanks
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1answer
36 views

What statistics test to compare the repartition of multiple choices between two groups?

I made an experiment about UX where the participant has to detect among five differents configurations the one that he prefers. The configurations are slightly different and are presented randomly 3 ...
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Comparing percentages from survey results with different response rate

I have to compare survey results based on a questionnaire floated. Out of total 50 questions, A responded for 40 questions. Out of 40 questions responded, answer for 30 questions are Yes. Out of ...
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1answer
72 views

On average of percents

I have read some pages about how to calculate the average of percents. However, still I don't understand something... Assume data points are organized in the following manner: We have two categories ...
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0answers
17 views

regression with percentage DV and multiple dummy IV

I am running a market analysis about e-mail responses for my marketing class. I have the following data entries: Observations: 400 different sequences of e-mails where sent to different target ...
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1answer
46 views

How to standardize count data for different sampling site sizes

I want to do a linear regression for my data but I’m not sure what I need to do with my raw data before running a linear regression. I have counts for species in several forests of differing sizes. I ...
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1answer
52 views

Difference in Quantile and cumulative percentage

How would you differentiate between the quantile function and cumulative percentage below? Note the treatment of numerics as categorical when grouping is performed. When would you use one over the ...
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26 views

Interpretation of the phrase “percent reduction relative to”

In the book Freakonomics, the following phrases appear: "From 1960 to 1985, the number of police officers fell 50 percent relative to the number of crimes. I interpret the above to mean that $$ r_{...
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1answer
53 views

Regression with frequency rating in percent as dv

I seem to have a similar issue as asked in this thread, nevertheless I'm still clueless about what model I have to fit to my data. I conducted a repeated measure experiment (consisting of 2 sessions) ...
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0answers
34 views

T-test for “discrete” variable

In my dataset, I have 2 columns. Both of them are a percentage. However, they only take the following values : (0,10,20,30,40,50,60,70,80,90,100). I would like to know if I could do a t-test on those ...
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1answer
19 views

How to report percentage change in proportions?

I want to compare changes in the proportion of fruit purchases over time for a household. For example, in year 1, 4/40 (10%) fruit were apples, in year 2, 12/80 (15%) fruit were apples. When ...
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1answer
68 views

Interpretation of variable in a probit model

I am struggling interpreting the coefficient of a variable which is expressed as a proportion in a probit model. As it currently stands , I am interpreting the average partial effects of this variable ...
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Comparing percentiles of datasets of varying sizes

I am trying to build a simple anomaly detection solution. I have a dataset with normal observations. It has about a 100 values. I calculate the ...
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67 views

Statistical significance of percentage difference for a poll question with multiple options?

The question is: how to calculate the statistical significance of difference between percentages in the case described below? Suppose we have a poll question with $n$ answer options $A_1, …, A_n$, ...
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Should I use weights in calculating the Coefficient of Variation for transformed proportions?

I have percentages of people having an event for 21 regions. Since I want to calculate a Coefficient of Variation, I took the arcsine of the proportions to normalize data. The problem is: every region ...
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44 views

Ratio measure vs. difference measure?

I am comparing food inflation estimates from different sources for the same year and country. Food inflation can be negative or positive, e.g. year 2010: 5% in Source A and 7.5% in Source B; year 2011 ...
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1answer
17 views

How to create a model in which one predictor variable creates an x% increase in response?

I have two different predictors "A" and "B" that can be used (not at the same time) to affect a response variable, "C". Previous data has shown a very strong linear relationship between A and C, ...
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1answer
81 views

Machine Learning model with aggregated data as training

I would like to predict a LABEL: A,B or C using a classification machine learning model. My data to train the model is like: ...
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1answer
53 views

How to test for differences between two distributions with percentages?

Imagine there are two distributions: Distribution 1 lists the shares of each ice cream flavor of all favourite flavors in village A: ...
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3answers
80 views

Black Friday Staffing

Say I am running a store and I have the daily customer count for the last 5 years. I note that the average customer count on Black Fridays is three times higher than the average for the rest of the ...
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162 views

Converting standard deviation of percent change to absolute change

I have the following data: However, I wish to know the standard deviation of the absolute change rather than the percentage change. To clarify, for Cloz: absolute change = 0.14*53 = 7.42, and we are ...
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1answer
29 views

Statistical difference between multiple groups using percentage data

I have 3 groups of data. Group 1 contains 11 values, group 2 contains 7 and group 3 contains 11 values. The values are in the form of 'percentage change over time'. I would like to test to see if the ...
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2answers
34 views

How to account for missing observations in multivariate regression?

My research concerns the eBay feedback mechanism. users have a "feedback score" (total positive reviews less negative reviews) and a "feedback percentage " $\frac{positives}{positives+negatives}$. ...
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Testing for a substitution over time

I am trying to test what types of jobs IT employees are replacing in an industry. My data looks like this. Each of the values in the rows are percentages (I'm not sure how to put a percentage in a row ...
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Would I calculate the percentage difference or percentage change?

I am interpreting data which is concerned about the level of CO2 emitted. The value of 322 is the expected value, but 292 was actually the measured value. Would I then calculate the percentage ...
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23 views

percentage of a normalized value

Let's say we have N cookies. We are giving the cookies to kids in different schools in different states. Each school has a fixed number of kids. We want a final value of cookies per kid for each ...
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31 views

How to combine count data and percentage data for ordination methods?

The system I have has multiple sites each of which was surveyed for biodiversity. Some species are too hard to count individually so we used percentage cover, others were easy to count so we have ...
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6 views

How to calculate a 'relative percentage' from an online survey

I'm not sure if 'relative percentage' is the right terminology here, but here's my problem: I have created an online survey which consists of 50 questions with simple yes/no answers. The questions ...
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1answer
41 views

Difference vs log-difference: do they behave similarly?

Consider two positively-valued time series, $\{X(t),Y(t)>0|t\geq0\}$. Now consider two transformations: $$ U(t) = Y(t) - \beta X(t),\\ V(t) = \ln{[Y(t)]} - \ln{[\beta X(t)]}, $$ with $\beta>0$ ...
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1answer
64 views

Do equal percentage changes mean perfect correlation?

Consider two datasets, say time series $\{X(t),Y(t)|t\geq0\}$, and that the two experience an equal percentage change from one period to the next for all time. That is, if there is an $\alpha \%$ ...
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Need help finding correlation between output and tax rate? - Best method to do so

I am currently doing a study on the impact of a change in agriculture taxes on agriculture output. I want to compare output (volume in $) data for years 2013-2014-2015-2016-2017 in different crop ...
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219 views

Is it meaningful to calculate percent change on the average of N normalized data series?

I have N financial series consisting of 20 yearly revenue values each. In each series, there is a comparable trigger occuring during one year, but it doesn't necessarily occur in the same year across ...
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0answers
26 views

Analyzing data expressed as a percentage allowing for phylogenetic signal

I am analyzing a dataset which consists of measurements for several different metabolites over a number of species. In each cell, the data are expressed as the percentage of the metabolite j in the ...
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1answer
31 views

Relationship between coefficient of dispersion and percent of data points above the median?

If I know the coefficient of dispersion and the median of a data set, is it possible for me to then calculate the percent of data points that are above the median? For example, what if the median is ...
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1answer
53 views

Percentile calculation for binary voting system

Consider a system like Tinder for example where users can vote yes or no to a profile (like or dislike). If Tinder wanted to come up with an internal percentile rating of a user based only on the ...
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1answer
86 views

Would “percentage of correct answers” be considered interval or ratio data?

I'm currently working on a research assignment an I'm trying to determine whether a dependent variable like "percentage of correct answers" would be considered interval or ratio data. I was originally ...
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1answer
95 views

Combine two different probabilities

I'm not sure how to best phrase this, but I'm not sure how to combine two probabilities (or if that even makes sense). Example: Assume that 5% percent of the population has a particular gene is 20 ...