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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1answer
52 views

Assess statistical differences between groups

I have a list of percentages of words per group, something like: ...
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24 views

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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1answer
53 views

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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2answers
21 views

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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13 views

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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13 views

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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20 views

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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37 views

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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21 views

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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14 views

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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23 views

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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1answer
27 views

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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6 views

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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7 views

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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1answer
20 views

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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4 views

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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1answer
13 views

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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1answer
40 views

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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14 views

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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10 views

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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1answer
30 views

For companies competing in the same field, how to test if their market share changes over a period of time is siginificant

Suppose 3 companies, A, B, and C, compete for market shares in the same field. In year 1, their market shares in percentage are a1, b1, and c1. And in year 2, market shares are a2, b2 and c2. With $\...
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1answer
22 views

How to give a percentage change interpretation for diff-in-diff coefficient of interest?

I'm doing a diff-in-diff to see whether a chosen regulation has an effect on goods exports. I got my coefficient of interest result as being -53,157.68, which would mean that this regulation caused a ...
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1answer
12 views

Check if multiple percentage are significant

I have 3 measurements of a very skew distribution, depending on three different technique. In general, I can do thousands of test and the result is either "fail" or "success", being the "fail" far ...
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6 views

How normal fluctuation could be calculated considering significant growth?

I would like to compare two years of data to find out normal fluctuation, however, percentage change does not help much because of the significant increase. The pattern seems pretty similar throughout ...
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1answer
45 views

Trying to determine which distribution to use for my percentage data for mixed effects model

I am seeing a lot of different answers to percentage data, either beta or binomial with a logit link and not to use poison distribution because it isn't count data. My response variable is retention ...
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1answer
19 views

Determining the statistical significance of change in incidence rates

What is the approach to use to determine the statistical significance of change in incidence rate over years? Below is at table showing such kind of data of incidence rate per 1000. ...
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1answer
247 views

How many tests should we do to estimate the percentage of people who contracted COVID-19 in Lombardy?

Lombardy, a region of Italy, registered many severe cases of COVID-19 in the last few months. Unfortunately the available data don't allow us to estimate the percentage ...
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38 views

Average percentage

First time posting so I apologize if I'm leaving out something. I have a sheet to keep track of project costs and coverage ratios, see example below. First column is for expenses, second column is ...
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3answers
42 views

% Change for value that didn't exist before

I want to record the percentage change of a value from one week to another. For example: I deal with a client who brings in 10€ is week 1. In week 2, he brings in 30€. The percentage change is a 300% ...
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CALCULATING DIFFERENCE between percentages derived from two different numbers (help)

I recently came across a graph comparing education levels between foreign born immigrants and US born citizens that was divided into four categories. Less than highschool, Highschool graduate, Some ...
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Testing percentages when I may or may not have the original values that give the percentages

I've found tons written about testing proportions between two groups (Fisher's exact test, $\chi^2$-test, logistic regression, etc) but very little on what happens in a t-test-like setting where the ...
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70 views

How to estimate 95% confidence interval for the mean of proportions in a very small sample (n=3)

I have a dataset composed of 6 independent observations, where values are percentages (proportions) of a specific element in a set. There are 2 groups of observations, and each has $n=3$ observations. ...
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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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33 views

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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21 views

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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1answer
26 views

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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1answer
69 views

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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113 views

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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1answer
48 views

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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1answer
181 views

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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3answers
110 views

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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1answer
19 views

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 ...
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1answer
52 views

R survey sackage method for replicating SUDAAN proc crosstabs SEROW [closed]

I have been using SUDAAN's proc crosstabs to generated weighted crosstabs, percentages, and standard errors for counts and percentages. I'm trying to replicate this functionality in R and have gotten ...
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7answers
2k views

What kind of curve (or model) should I fit to my percentage data?

I am trying to create a figure which shows the relationship between viral copies and genome coverage (GCC). This is what my data looks like: At first, I just plotted a linear regression but my ...

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