Questions tagged [proportion]

A proportion is the fraction of some total that is of a particular kind, either (i) as a count of one type of thing out of a total count, or (ii) as a component of a continuous variable.

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13 views

Is this a valid method to test textual difference?

For some research I am trying to reject/ not-reject the null-hypothesis that the proportion of a word is higher in a certain sample of a text than in the rest of the text. The full text is a ...
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Conducting a meta-analysis of proportions and one proportion is negative

I am conducting a meta-analysis of proportions and plan to first use the Freeman-Tukey double arcsine transformation before meta-analysing the data. However, one of the proportions is negative (-1.3%)....
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How do I calculate the effect size with paired samples of proportions?

I am doing a meta-analysis and frequently need to calculate the effect sizes from the data since the effect size I am looking for is frequently not reported directly. I am looking at a paper where ...
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binomial vs betareg? glm for y=ratio

https://docs.google.com/spreadsheets/d/1e_XOgTv1flSFFleHSwUJJPBzBdd9VPXRaZc2oukwtrE/edit#gid=0[data][1] I'm using glm to evaluate the response of mammal species to different % of forest cover. My ...
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Can I use posterior beta parameters from a previous experiment to use as priors for my current experiment?

I am doing a Bayesian comparison between two proportions, H0 being Proportion(Protein)> Proportion(Mixed). Here the Proportion is of no. of times a free-ranging dog(s) ate from a box(Protein, Mixed)...
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Proper Test for same proportions (multiple categories) on 2 groups, not normally distributed data, different sizes

I have trying to research the proper test for the following problem. I have 2 groups with different sizes n1 and n2. From each groups I am randomly sampling the same % of samples. (so say kn1 and kn2)....
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unbiased estimation of the variance of $p$ (proportion) of a random sample without replacement

Given a random sample without replacement of size $n$ from population of size $N$ and $p$ is the estimator of the proportion $P$. How could one show that: \begin{equation*} \frac{N-n}{N(N-1)}pq \end{...
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How to find the credible interval on the difference between the means of two proportions in R?

I have two proportions of the beta-binomial family. x1=41, n1=88, x2=41, n2=90 (x= no. of successes; n=no. of trials). The beta prior shape parameters for the two proportions are alpha1= 20, beta1=26, ...
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How should I compute confidence intervals for a proportional estimates of a Poisson count?

I'm developing an microbiological assay for enumerating defined mixtures of different bacterial strains that all have similar growth requirements and can't be distinguished by visual characteristics. ...
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One-sample: difference between two proportions that are parts of the same whole

What is the sampling distribution of the difference between two proportions when they are parts of the same whole. It's relatively easy when one proportion is binomial, the one of the common ways to ...
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High Bayes factor while comparing two proportions

I am doing a Bayesian test of proportions to compare 3 proportions (Whether or not a particular box out of 3 boxes has been eaten from more by dogs. The 3 boxes have 3 different types of food ...
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Comparing an observe proportion to a theoretical proportion of 1, which test? [duplicate]

I tracking a variable "cured" with yes or no. At D0, all patients present a disease I. A treatment is administered and at Dx, the doctor assess if the patient still have the disease I or if ...
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mixed model for proportion response variable

I have data that measures the proportion of cropland that was affected by drought for 10 locations measured across 10 years. as shown below: ...
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Meta-analysis on percentage of total calorie intake

We are looking at a number of studies which have profiled nutrient information which contributes to total daily calorie intake. For example, fibre might make up 5% of daily total calorie intake. My ...
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Should I sum across variables before comparing proportions between groups?

I have the a dataset like the following: Experiment A B C Group 1 10 1 3 M 2 30 10 10 F 3 20 30 10 M 4 1 15 4 F And I am looking for differences in the proportions of A, B and C between the ...
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What test to compare an observe proportion to a theoretical proportion of 1? [duplicate]

I'm analyzing a variable a binary variable, cured, where cured simply means a patient no longer has a disease (named disease A). At D0 (an initial time point), all patients have disease A. A treatment ...
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Test difference in proportions between values of same polytomous variable

What is the right test to compare sample proportions between two values of the same polytomous variable? Basically I'm searching for the right search term. E.g. consider a survey question, Q1. What ...
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How to compare a population proportion to a probability of success of 1?

I would like to assess whether my population proportion (P1) is significantly different from a hypothesized value (P0). I would usually use a binomial test to test this hypothesis. However this time ...
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How to factor in imprecise classification into proportions test

I have two large groups of observations, A and B. My hypothesis is that group A is proportionately significantly larger than group B. I know from analyses of random samples, however, that 12% of the ...
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Multi site data, logistic regression

I have a data from two hospitals and wanted to perform cox ph modeling on them. Prior to doing that, I ran logistic regression on the hospital variable (0-hospital A, 1 hospital B) with all the ...
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Wilcoxon signed-rank test for count-proportions?

Let's say that I have several agents able to take action A or B, and I am interested in showing that taking action A is more likely. So I have a table that looks something like A B 10 2 14 6 ... .....
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Visualizing distribution of sample proportions that takes into account of the sample proportion uncertainties

I have calculated several sample proportions in my dataset that stem from an unknown population distribution - likely a beta mixture. I would like to perform some exploratory analysis to visualize the ...
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Help with Behavioural Test Data

I am working in ecological research on termites, and last year we conducted a series of behavioral tests to check for intraspecific aggression in some mound-building termite species. To investigate ...
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Choosing correct multiple comparison method for proportions

I am examining pairwise differences in proportions. I have 19 groups giving a total of 171 comparisons in a data set with $n \approx 40000$. I am unsure about which multiple comparison adjustment that ...
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Am I using the right test to to evaluate my treatment effect?

I have calculated a p-value (with this solution), for the percentage change from the control to treatment group (1 compared to 2, 3 compared to 4 etc.) below, for each level of ...
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Comparing datapoints expressed as proportions

My stats knowledge isn't very advanced, so it's been difficult to find any resources for the exact kind of comparison I want to do. As a summary: I'm measuring insect development (i.e. how many bugs ...
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Comparing multiple sample proportions between two groups

Hi all and thanks for taking the time to read this question. I'll try to be as clear as possible! The data: I have one sample of patients which was divided in two groups based on a binary variable for ...
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Time series proportion/share modelling issue

I want to model import share (one commodity product in country) as dependent variable from local price premium (local price minus import price) and seasonality factor (0 or 1). Model is used to make ...
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How to demonstrate a significant difference in a proportion

I want to show that if you don't take enough biopsies from the oesophagus for certain patients then you are more likely to not detect an illness . The counts in the table are the number of ...
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How to test the equality of two proportions with multiple samplings?

I am searching for a statistical test to compare two proportions of responsive cells. I know that Khi2, z-test and Fisher’s exact test allow this kind of comparison but the issue I have is that I have ...
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How to compare count distribution of multiple categories across months and years

I have animals counts organized into six size classes. These were taken across six months in three different years. I would like to compare the distribution of counts across size classes, between ...
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statistical testing of proportions to include multiple experiments

I am struggling with understanding what is the correct statistical method to use to determine the statistical difference in proportions for multiple experiments. Let me explain my scenario. I have run ...
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How to compare proportion of a category in a sample vs its proportion in a population

No. of observations in the dataset = 19,277 There are 2 features : Country & Job role. There are 5641 respondents from a country, India. There are 5171 respondents that are students. Of the 5641 ...
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What statistical test can I use to compare proportions across two different groups containing multiple populations?

I am trying to answer a research question about whether the presence of a certain pathogen affects the age structure of frog populations. Study set up: Samples were taken from frogs at multiple study ...
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How to analyze contingency table results? Help with wording to describe observations

I'm learning about contingency tables and proportions. Need help interpreting this table of students interested in one of three subjects by gender. Male Female Science 20 (30.8%) 20 (30.8%) Math 30 ...
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Descriptive comparison of interactions

I want to identify trends and analyze several discrete variables (around 100)(value= 0 or 1) between 3 independent samples. Each random sample has 10000 observations. For example, subset 1 is 10000 ...
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Mixed (within and between subjects) design - how correctly test the difference in proportions

I have the following design (I strip it from as many irrelevant details as possible). Each subject is asked two questions: Baseline condition: M1. Do you trust people from city A (Yes/No) M2. Do you ...
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Bernoulli trial confidence intervals

I am working through an example in my notes and I am not sure how they arrived at the solution. The question reads: "7 successes are observed in 20 trials. Find a 95% confidence interval for p&...
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margin of error when proportioning sample space

I have the dataset that contains 10660 chess matches. 3000 of these matches start with the same opening. I want to proportionate this rate to 100000 matches, and when I did it, I got the result of ...
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Calculate sample size (n) for 2 populations

We have a pre-study that gives us the amount of people voting for the left wing in one region (0,25%) with N = 123490 and (0,22%) N = 150578. We need to know how large sample sizes we need in order to,...
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ANOVA equivalent for proportional dependent variable?

I want to test for significant differences in different years of a proportional variable in my data set. Essentially, I know I can do an ANOVA to show that there are significant differences between ...
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Application and confidence interval of McNemar test in comparing methods?

Given a known cohort (say all male) of 1510 people, if method A and method B are applied to predict M/...
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Should I use Chi-squared or exact binomial test?

I am testing for the difference in 30-day mortality between an exposure group and a non-exposure group. The contingency table: Taking drug A Dead at 30 days post-op Alive at 30 days post-op Yes 3 25 ...
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Confidence Interval around a single strata's proportion in a stratified random sample?

I am conducting a stratified random sample of properties in 10 cities of a binary attribute (has fence yes or no). This is using remote sensing so no response rate, it's me inspecting images of ...
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How to model proportional data of >2 categories on continuous predictor variables

I am trying to model data in which I have 2 continuous predictors and a proportional response, but it isn't a single proportional value, but rather 5 different categories, whose proportions all sum up ...
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Hypothesis tests for mean and proportion

I believe that I am making a serious mistake in understanding how to conduct a hypothesis test about mean and proportion. From what I have understood, we have a value under the null hypothesis. If our ...
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Confused about Two Sample Proportion Tests - am I performing this correctly?

I am dealing with an advertising dataset that includes hundreds of advertisements, how many clicks each ad receives, whether the amount of clicks received is considered "high" or "low&...
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How do I Calculate the correct sample size for a test of difference in proportion in this specific case?

My brother is comparing a number of advertisement campaings. He wants to know how large the samples must be in order to determine whether a 2 percent difference between twp proportions is going to be ...
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How to determine the most representative distribution of a small sample of size N?

Given a list of World Heritage sites by country of the top 5 countries + 5 other random countries: ...

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