# Questions tagged [percentage]

Number or ratio expressed as a portion of 100

107 questions with no upvoted or accepted answers
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0answers
141 views

### Which approach can be used to regress sleep time on brain mass, in this data set?

I was reading this blog post: https://htmlpreview.github.io/?https://raw.githubusercontent.com/avehtari/BDA_R_demos/master/demos_rstan/sleep.html the author describes a model to predict how many ...
2answers
329 views

### How do I test difference in Percentages?

I have some survey data and know the number and percentage of "yes" responses. How do I determine if any of the percentage yes regional responses are statistically different from the national yes ...
0answers
55 views

### Rank forecasting from uneven samples

Say we have a bag of chocolate balls. There are $I$ different unique colors. Our bag has an unknown number of balls for each color. We want to get a sense of which color people like the most and ...
0answers
6k views

### Comparing two percentages

How would I go about comparing two percentage figures from two different sample sizes? For example: Sample 1 - 10% (220,510 out of 2,205,100) of respondents answered "yes", Sample 2 - 31% (12 out ...
0answers
578 views

### Percentile vs Percentile rank

I have the read the definitions many times and I still don't quite understand the difference. This article says: A statement such as: "A score of 600 has a percentile rank of 80" has a ...
1answer
30 views

### Significance Between Two Percentage Decreases Over Time, Not Mutually Exclusive Variables and Different Sample Sizes

I work in an healthcare improvement department. I have spent a large amount of time looking for the best way to test this problem for significance and have come up short. If you take a look at this ...
0answers
68 views

### Comparing Percent Changes

I want to present information in the "most unbiased" manner possible: State XYZ increased GDP by 5.0 % last year The US increased GDP by 1.0 % last year Is there any (statistical?) bias in the ...
0answers
2k views

### Confidence Interval for a Percent Change

A mentor has asked me to calculate the 95% confidence interval surrounding a percent change. To help frame the question, I have calculated the incidence of a disease within the population as follows: ...
0answers
74 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 ...
0answers
86 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 $A_1, …, A_n$, ...
0answers
49 views

### Which test to take when compare two continuous distribution(LIWC score)

I am now working on a project that try to extend the LIWC dictionary to fit our local language (mixed English, Indonesian, Malay and Chinese). We use a word embedding model to find similar words to ...
0answers
110 views

### How to calculate contribution of multiple factors to a single dependent variable

I have 4 experiments: control control+factor1 control+factor2 control+factor1+factor2 Here is the example data of the difference between the sensitivity experiments and control experiment (A=exp[4]...
0answers
93 views

### What is the distribution of this random variable?

I have in my possession a theoretical and practical test that evaluates the knowledge of a semester of the subject Probability and Statistics, that is, I am practicing for an exam by attempting ...
0answers
110 views

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### 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 ...
0answers
13 views

### z test for sum of two percentages as greater than 100

I have a data set in which participants made a choice between two options--option A and option B. Participants were assigned to either choose an option or reject an option (so, there are two ...
0answers
95 views

### Converting Cohen's d to a Relative Risk for a model-based economic evaluation

Hello researchers: my question is about the use of forest plot results for an economic model. In a forest plot you could have the following results: 0.34 [0.22, 0.45], which would be the pooled ...
2answers
45 views

### Distance measure for binary arrays

Basically if I have binary sequence that I want to check against, and I want to determine how far other binary sequences are to this first sequence, what is the most appropriate measure to use. The ...
0answers
25 views

### Regression question from Freedman Statistics

From Freedmans statistics, page 165, Regression, Exercise Set D. Question : Answer : "Well under 50% - the regression effect" I'm not sure about the reasoning for this though, I'm not sure I ...
0answers
69 views

### How to compare the marginal variation of two groups with a big difference frequency between them?

I have two different groups (A) and (B) and I would like to compare the marginal variation of the frequency for each time of both groups but, each one of them has a different frequency for a given ...
0answers
84 views

### Interpretation of dependent variable when one independent variable is a percentage

I have the following regression: $Revenue = B_0 + B_1*ForecastError + B_2*OilPrice$ Revenue is in dollars, Forecast error is in percentage but written out as decimals (Example the data is written ...
0answers
91 views

### Analysis strategy for left skewed percentage response variable

I have a dataset that is made up of percentage values of DNA methylation at a number of loci and we are looking to model the relationship with a) a treatment and b) a genomic annotation. The histogram ...
1answer
88 views

### How can I calculate SD when displaying data as a percentage?

Hypothetically, I am trying to make a graph representing the abundance of 4 species in a quadrat. I want to display this as a % of the total number each species represents. Here is an example dataset: ...
1answer
74 views

### Which statistical test to use (percentages of codon usage)?

I would like to compare each codon usage percentages between analyzed organisms (which will result in 6 separate statistical tests, subject to 6 codons). Which statistical test should I use? ...
0answers
71 views

### Test for difference between groups: percentage variable

I have 1249 census tracts in Colorado. I've grouped them into three groups, based on whether or not they are in "hot spots, "cold spots", or "neither" for their smoking prevalence (%). I'm trying to ...
0answers
1k views

### Combining percentage from different categories

I have to combine two percentages from different categories, which are questions answered / total questions: 2/10 * 100 = 20% 3/6 * 100 = 50% I combined both percentages ((20+50)/2)*100 = 35% ...
0answers
35 views

### In multiple regression, how to interpret multiple percentage covariates?

I have the continuous variable Y and the predictors Pct_less10, Pct_10to20, and Pct_21plus. NOTE: The predictors are basically percentage of people under age category and they add up to 1. So my ...
1answer
31 views

### Is there a more appropriate way to interpret/look at this Maternal Mortality Rate data?

My fiancee and I are discussing maternal mortality rates in the US. According to the data, from a May 2017 NPR article, 26.4 out of every 100,000 women die during child birth in the US. My fiancee ...
0answers
23 views

### Compare percentages of letters between words of different sentences (i.e finding significant changes between multiple distributions of percentages)

To explain in an abstract way what I am trying to investigate, please imagine that you are interested in seeing if certain letters are enriched in the words of a sentence compared to the words another ...
0answers
568 views

### SPSS Chi-Square using only percentages

Here's the data that I have (percentages only) Gender: M = 60% F = 40% Expected: M = 50% F = 50% How do I use SPSS to run $\chi^2$ test since I only have the percentages?
1answer
198 views

### transformation of response variable which is in percentage

Here's my data. https://www.dropbox.com/s/puf57efqkdl8zt0/data.csv?dl=0 It's too big, therefore I did not know to use the dput(data) command. I am using a ...
0answers
60 views

### Comparing percentages of 10 different groups without access to the raw data

I have access to the percentages of referring to "X" for 10 different ethnic groups. Let's say, A1 to A10 as shown below A1: 9.22 A2: 11.40 A3: 12.68 A4: 17.89 A5: 19.53 A6: 19.84 A7: 29.34 A8: 30.77 ...
0answers
88 views

### How many times more likely are the members of Group A to be diagnosed with virus X compared to the members of Group B?

Suppose Group A makes up an estimated 2% of the population and Group B makes up an estimated 98% of the population (Group B consists of everyone who is not in Group A). However, Group A accounted for ...
0answers
470 views

### Regression with percentage-point change as dependent variable

I want to look at the correlation between a change in prevalence of a particular outcome (expressed in percentage points) and a continuous predictor variable which is an index. So for the response ...
0answers
134 views

### Aggregation system for percentage Key Performance Indicators (KPIs)

I need some suggestions for an issue regarding our business intelligence (BI) system, percentage Key Performance Indicators (KPIs) and average values. I am using a BI system for our organization, ...