# Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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15 views

### Transforming means/averages into percentages/relative numbers

The question might be simply, but I am still a bit confused, so any help would be much appreciated. I am working with a table that looks similar to the following, where I have the base-revenue "...
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### Assess statistical differences between groups

I have a list of percentages of words per group, something like: ...
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### Modelling zero-inflated percentage data (vegetation cover) from single predictor variable

I am quite new to regression in R. I would like to analyse the relationship between 'Vegetation Cover'(response variable) and a single predictor variable 'Canopy Openness'. 'Vegetation Cover' is a ...
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### Regression when both input and dependent variables are percentages

I have a dataset where I am trying to understand if there is a correlation between two variables: an input which is the percentage of a group that is white (which varies between 40% and 95%), and an ...
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### best regression model for a percentage of function variable

I am trying to choose the best regression model for a dependent variable 'percentage of normal shoulder function'. This variable is non normal and clustered at the high end of the possible range, ie ...
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### How should I transform right-skewed percentage data with zeros? [closed]

I am dealing with a data set on student attendance, or more specifically, student absence rates. The data is right-skewed, and most values fall between 0 and .3. What kind of transformation can I do ...
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### Analysing Percentage Data inc. Phylogenetic Bias?

I'm attempting to analyse a percentage / proportional (derived from count) response variable across several species, allowing for consideration of phylogenetic signal. I'd like to model this data ...
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### Betaregression: What to do about asymptotes

I analyse the degradation of plastic over time. We have three replicates per time point. Degradation is measured in % area loss. So far I analysed data therefore with betaregression (with the ...
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### Comparing percentages with different denominators to derive metric

I have read similar question posted here but could not find an answer to match my specific problem. So I have a list of countries and number of POI in each country. For eg. Austria (Total POI) : 100 ...
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### Interpretation of this beta value

I have a dependent variable 'Y' which is measured in percentages between 0 and 100. I also have an independent variable 'X' which is measured in whole numbers from 0 to 2000 (SD = 330). R gives me a ...
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### How to estimate the correlation between ratio and ratios' denominator

It is a bilogocal issue. I've got measurements of four skeletal elements, 64 observations in total. I produce the ratios, dividing each element length by the sum of elements (sum size) for each ...
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### 0 - 1 data with asymptote: Which distribution/type of model

I'm analysing data on degradation over time. Degradation has to be expressed as percent. Therefore I use betaregression. However, we repeated to measured degradation after 100% degradation, therefore ...
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### GLM cell counts vs. offset with or without percentages

I have counted in a defined cell population (all_cells) the number of positive cells with marker A (cell_counts_a) and the ...
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### What is the correct way to represent the variation around an average percentage?

This is an example of my data: I understand that the mean should be calculated by (Total number "Yes" / Total number of websites)*100, however I want to represent the variation around this ...
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### Metric to measure distance between two percentage values [duplicate]

I would like to find a function that measure how much two percentage values differ from each other. Now, a norm $\|\cdot \|$ does not quite fit this criterion as a jump from 1% to 30% is, for many ...
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### Ljung-box test on weekly percentage of total quarter bookings

I have a data on the weekly percentage of the total quarter bookings. The data looks as follows (note: weekly percentages add up to 100 for each quarter) : (not real data) I used the Ljung-box test ...
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### Correlation between two percentages

I'm trying to describe the behavior of a scatter plot I have. I'm looking at the results of a game that occurs in rounds where one player is voted out each round. I'm trying to find a correlation ...
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### Which test for defect rate comparison? (2 periods of time with multiple lots)

On the period A, 100 lots are inspected. On the period B, 40 lots are inspected. For each lot, the defect rate is calculated (nb units rejected/nb units inspected). I want to compare the defect rate ...
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### Choosing a regression model for proportion data at the school level

I am working on a dataset where I have the percentage of students who passed at a test for each 189 schools in my sample. The data is aggregated, so I have the total number of student who sat the test ...
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### Please help me win my argument! What is an appropriate statistical test to use on Proportional Data?

I recently got into a debate with a friend of mine because I claimed that the 9th circuit court tends to have its rulings overturned at a greater rate than other courts (this is about statistics trust ...
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### Do percent variables need to be scaled for machine learning?

I have 101 independent variables in a logistic regression predictive model. 55 variables are continuous and 46 are categorical one-hot encoded. 5 of the 55 continuous variables are expressed as ...
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### Should I correlate the empirical or percentage change?

I would like to correlate - let's stick to Pearson's $r$ first - the change of the paired data ($n < 30$) taken "before" and "after". Should I consider the empirical or percentage change of the ...
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### Regression alternatives for proportional data that do not rely on the 0 - 1 interval

I'm currently analyzing data consisting of change in cognitive performance and how it is related with a physiological variable (enzymatic activity) in a group of people. As all people were assessed ...
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### What is the best method to determine statistical differences between percentages that do NOT satisfy ANOVA assumptions?

I am working a project where I analyzed image classification accuracy percentages for three algorithms. I laid out 36 plots in an agricultural field and took aerial images over a period of 5 (non-...
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### Convert negative to positive percentage range into 1-10 scale

I know how to convert a range of positive % numbers into any positive integer scale, but am having trouble figuring out how to do it when my % range includes negative %s. Example: I have the ...
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### How to find standard error or standard deviation of the percent difference between two prevalence values?

I am having trouble working out how to find the standard error or standard deviation for a column that contains the percentage points difference for two prevalence values. I have general practice ...
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### What is the right regression model if the dependent variable is a percentage?

I have a database where I have a population divided by income percentiles. For each percentile, I have data about the average income, and the percentage of children that attend at least some college ...
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### Why report percentages over proportions?

Proportions and percentages, as I understand them, show the same information. So why report one over the other? Or perhaps what I'm really asking is "Under which circumstances would one be preferred ...
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### Modelling exchange rates: how to log transform percentage changes?

I'm trying to model an exchange rate to test for extreme values. However, I have percentage changes from day to day. Given some changes are negative, I can't take the logarithm. Any idea how I could ...
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### Mean absolute percentage error returning NAN in PyTorch [closed]

I'm using mean absolute percentage error (MAPE) as a loss function for an RNN, however during training I start getting NaN values. I first used MAPE to calculate error between sequences of 3D ...
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### Calculate standard deviation for percent change from baseline of mean difference between groups

I have data from a study that compares two treatments for lowering plasma cholesterol. The data is reported as mean cholesterol before and after the intervention with their associated SD. The ...
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### linear regression with dependent and independent variables as percentages

I would like to test whether the prevalence (in %) of parasite-infected individuals of population A (second host) is correlated with the prevalence of parasite-infected individuals of population B (...
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### test for significant difference between before and after percentage

Data Structure Time A B C X 12% 58% 30% Y 17% 60% 23% Researcher X reported percentage of Category (A,B,C) few year ago. However, failed to ...
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### Matrix of confusion - percentage per row or column?

When you build a prediction model on a binary variable, you have a confusion matrix which compares your predictions according to real values. ...
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### T-test for percentages

I have data from 50 different English second language classes. Each class I have a percentage of students that passed Test A before the language program and Test A again after the program concluded. E....
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### Two formulas giving slightly different output

I am struggling to find a proper explanation why the two methods that I use for finding the difference in EXCEL are giving me two slightly different numbers. The idea behind the task is that we have ...