Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Make your voice heard. Take the 2019 Developer Survey now

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.

1
vote
0answers
18 views

Comparing Test and Control Lift in Proportion

I have two groups - a test/treated and control group - for which I am trying to assess whether the lift or percent change in proportion from a pre to post period between the two groups are unequal. I'...
0
votes
0answers
12 views

Comparing survival rates

The question I have is focused on comparing remission rates at a fixed point in time. For example, I have cancer type A and cancer type B (the two are not mutually exclusive groups) and all patients ...
1
vote
1answer
22 views

Where is my potential flaw in my Z-test of Proportions?

I was working through this z-test of proportions example I found online. The online example solutions says that the difference between the groups is statistically significant, whereas I concluded it ...
1
vote
0answers
34 views

Is lmer or glmer appropriate for nested continuous proportion data

I have a reviewer that wants me to analyze my data along the lines: Con_Ratio ~ Range * Latitude * Longitude + (1 | Genotype/Pair). But I'm not sure if this can be done and how. My experimental ...
0
votes
0answers
33 views

specific equation for modified wilson confidence interval

I recently read the Brown, Cai, Dasgupta paper on interval estimation for a binomial proportion where they propose the modified wilson method as a better alternative to the standard wald interval. I ...
1
vote
1answer
24 views

Are there statistical tests for testing multiple sample proportion?

For categorical variable testing, we have chi-square test. For example, we want to test if a dice is fair (assuming sample has [6,5,7,7,6,5] and ...
0
votes
1answer
34 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 ...
0
votes
0answers
10 views

Why don't we need to use a t-distribution for difference of proportions tests? [duplicate]

In difference of proportions tests we use a Z-distribution. And in Chi square tests which I understand are in practice the same test use the square of the Z-distribution, the Chi square distribution ...
0
votes
0answers
11 views

compare distribution a categorical variable between a population and a subpopulation

So I have the following situation of having a population P with individuals belonging to categorical variable A, ..., N. From this known population I created several sub-population P1, P2 (each time ...
2
votes
1answer
28 views

Standard error of a proportion on a 2 x 2 contingency table

Why on a 2 x 2 table such as where $p = \frac{a}{a+b}$ the standard error of $p$ is $$\left(\frac{(a+c)(b+d)}{(a+b+c+d)^2(a+b) }\right)^{1/2}$$ ?
1
vote
0answers
33 views

Should I use a binomial glm, beta regression, uniform continuous distribution or nls with logistic regression for probabilities?

I made an individual based model in which there is a population of three types of individuals (lizards) that disperse randomly until they encounter another individual that has a beneficial effect on ...
1
vote
0answers
37 views

Comparing proportions between multiple groups - Fisher's exact test

I have a simple dataset on reproductive success of a certain plant species. Reproductive success was defined as a proportion between number of flowers and number of fruits. We measured on 10 different ...
0
votes
0answers
16 views

Cochran's Q test with changing proportions

for my thesis I am investigating the change in proportions of children in regular and special education. The information is obtained through an online questionnaire, and I have data for 4 consecutive ...
0
votes
0answers
29 views

Statistical test for binned proportion data in JMP / MATLAB

I have been trying to determine the proper statistical test for comparing binned proportional data between groups. My data set is individual subjects (4-5 per group) with 76-165 cells per individual. ...
0
votes
1answer
25 views

Z-score for weighted proportion

I have a question regarding the Z-Score test when it comes to compare two proportions. Usually, one would use this formula to obtain the Z-Score: and then compare it to a Standard Normal ...
0
votes
0answers
22 views

Testing the goodness-of-fit for the binomial distribution

As specified in the title, I'm trying to understand how to test the goodness-of-fit for the binomial distribution; to this aim, I followed what suggested in this link. Particularly, I'm investigating ...
0
votes
0answers
16 views

How do I model whether compositional data changes over time? [duplicate]

I have a data set of diet proportions over time (this is just a sample): ...
0
votes
0answers
15 views

Compare overall proportions between 2 samples

I want to compare multiple proportions between two samples. There are 60 brands of toys (T1, T2, T3...T60). I would like to know if overall, the proportion of respondents who own each brand of toy is ...
0
votes
0answers
10 views

probability to belong to the majority class based on observed proportions

I have a population of several categories and I don't know the proportion of these categories in my population. I want to draw (with replacement) in my population until I can say with 99% certainty ...
1
vote
1answer
17 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 ...
0
votes
2answers
32 views

How to define sampling unit. t.test vs proportion test

In my particular case I am comparing damaged fruit in several treatment fields vs. several control fields For simplicity: Both treatment and control have 10 bushes each. a cluster of fruit is taken ...
-1
votes
0answers
12 views

hypothesis testing of proportions between two groups for survey data

I have a question regarding hypothesis testing of proportions in a survey. The survey has 7,000 full responses and consists of 5 questions, each with 3 possible answers;disagree, don't know and ...
5
votes
2answers
300 views

Regression when both the predictor and outcome variables are proportions

I am using $X$ The estimated pre-game win probability of a sporting team playing on its Home field (estimated according to a certain model) to predict $Y$ Actual proportion of points scored by ...
-1
votes
0answers
10 views

how to compute a minimal sample with some prior information?

Suppose N = 30, 000 students in total and a SRSWOR of size n will be taken from the population. And we want the proportion estimator ^p to achieve the precision with tolerance level e = 0.03, risk α = ...
1
vote
4answers
63 views

Frequencies/percentages different from zero - which test?

I conducted an experiment and had participants indicate binary judgments by either pressing "1" or "0" when seeing different types of stimuli. Now I want to test whether the proportions of number ...
0
votes
1answer
77 views

How likely is a random sample to be significantly similar to the full population?

I am looking for a way to compare the proportions between two data sets of surveys, where individuals can be placed in more than one classification. One of my groups contains the survey results of 10....
0
votes
2answers
46 views

Calculating sampling proportion's standard deviation given population proportion?

So the question is as follows (paraphrased): A population votes for/against a political candidate. In a sample of 200 voters, let $X$ be the fraction of people who vote for this candidate. ...
0
votes
1answer
38 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 ...
2
votes
0answers
41 views

Chi squared test: which is the correct null hypothesis?

I'm reviewing some literature in my field, specifically looking at whether physical activity (PA) has any beneficial effects on cognitive performance. The results across the studies are quite mixed. ...
1
vote
1answer
34 views

Bernoulli / binomial trials for a process with variable probability of success

One of the conditions for a Bernoulli trial (and by extension binomial proportion confidence intervals) is that the probability of success is the same every time the experiment is conducted. In the ...
0
votes
1answer
29 views

Model proportions as independent variable for binary outcome

I've binary (disease) outcome: 0, 1 with certain independent variables in proportions, and other covariates as - age, sex. There are Packages that model proportions as outcome variable but not other ...
2
votes
0answers
53 views

Beta regression where fractional response adds up to 100%?

I have a data set of people switching brands. Say #people switching from Brand A to Brand B, C or D. My data looks like this ...
2
votes
0answers
38 views

z-test of proportions vs chi-squared

A 2-sample z-test of proportions and a chi-squared test can both be used to analyze a $2\times 2$ contingency table. In fact, for $2\times 2$, $\chi^2=z^2$. Why can the same table, being used with two ...
0
votes
0answers
23 views

Solving multiobjective function

Consider the following table: ...
0
votes
0answers
26 views

How to test for a reduction in gendered language? What would the outcome variable be?

Say I’m looking at dating website profiles. I note 20 adjective that are much more likely to be used on females’ profiles than males’ profiles. I note another 20 adjective that are much more likely to ...
0
votes
0answers
40 views

Variance of the average of two (or more) Net Promoter Scores?

As per Wikipedia, "The Net Promoter Score is obtained by asking customers a single question on a 0 to 10 rating scale, where 10 is "extremely likely" and 0 is "not at all likely": "How likely is it ...
1
vote
1answer
24 views

One-Sample Test for differences between questionnaire-answers

For a rather large sample (>800 participants) I have answers from a questionnaire, containing multiple Yes/No-Questions. What I want to find out is, if the proportions of yes & no's differ ...
0
votes
0answers
20 views

How to test for difference in weighted proportion difference? (and average weighted proportion differences)

Suppose I have a survey where respondents rate different questions as positive (1), negative (-1), or neutral (0), and their responses are given a different weight based on which job they have and ...
1
vote
0answers
16 views

Comparing complex proportions between groups

I have a set of data where cells were collected from a number of subjects and phenotypically categorized (sample data below). I'm interested in asking how sets of antigen-specific cells change in ...
3
votes
1answer
17 views

Distribution of estimator of multiple (spatially related) proportions

Consider a spatial random process $Z(s)$, where $s$ denotes the spatial location. Our objective is to delineate the zone $\mathcal{Z}$ where the probability that $Z$ exceed a given threshold $\zeta$ ...
1
vote
1answer
49 views

Confidence interval for raw number of correct binary predictions

Let's say there are 600 games in an NBA season, and a competition among individuals to correctly forecast the winners of the games. The forecasts are not expressed probabilistically but simply in ...
6
votes
2answers
111 views

What is the best way to display confidence intervals around a proportion?

I was reviewing an article about the effectiveness of a vaccine and it expressed these in % effectiveness = 1 - odds ratio. So far, so good. But they showed confidence intervals around the %'s, both ...
1
vote
0answers
38 views

Analyzing tritomous categorical variable between- and within-groups

I have data examining a decision task across age groups. For the decision task, responses are categorical and coded into 3 possible decision types (A, B, C) that are mutually exclusive and exhaustive ...
0
votes
0answers
22 views

Repeated measures and bootstrap

I have data from 100 individuals where: 100 got test 1 50 got test 1 and 2 The outcome is binary I've just started statistics this summer, and was told to use a generalised mixed model to check for ...
0
votes
0answers
19 views

comparison of multiple groups when the dependent variable is a percentage

I am measuring the proportion of different types of bacteria killed by 4 different antibodies (simplified for illustration) ...
0
votes
0answers
9 views

Mantel Test of Proportion : Aggregating categories different significance

I have a dataset representing for a specific marketing event editions (1 event per 1 year), the number of partecipants, and the outcome of their partecipation If In sas I use the Mantel Exact test to ...
0
votes
0answers
13 views

comparing multiple groups by frequency

I have three columns: first one is the number of innovations by handicapped students, the second column is the number of handicapped students in a class of a school, and the third column is the total ...
1
vote
0answers
21 views

Longitudinal beta regression with random effects

I'm interested in modeling a proportion outcome (malaria positivity rate) as a function of some discrete and categorical variables. The dependent variable was measured repeatedly over time (3 years). ...
1
vote
1answer
34 views

Type of studies reviewed in meta-analysis of proportion

What types of studies are reviewed for meta-analysis of proportions? For example can I included case-control studies and collect data of number of events from the total cases?
1
vote
0answers
16 views

How to model if a company is mentioned in a review (volume) and how it is mentioned (valence)?

I am working with social media data of Brand A and would like to model what features of posts of Brand A are linked to if a competitor (Brand B) is mentioned in the comments of different posts of ...