Questions tagged [percentage]

Number or ratio expressed as a portion of 100

107 questions with no upvoted or accepted answers
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
2
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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 ...
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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 $A_1, …, A_n$, ...
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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 ...
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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]...
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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 ...
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0answers
110 views

Distribution of percent difference of two normal variables

I have two performance measures in a given experiment that I know to be approximately normally distributed: $X_1\sim \mathcal{N}\left(\mu_1,\sigma_1^2\right)$ $X_2\sim \mathcal{N}\left(\mu_2,\...
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0answers
195 views

want to calculate significance of pairwise sharing between lists. Standard hypergeometric test seems inappropriate

I want to calculate if the percentage of sharing of strings (genes in this case) between lists is significantly more than expected by chance for multiple pairwise comparisons between lists of strings. ...
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44 views

Resampling in R to see if percentage of pairwise sharing between lists is significant

I have three lists of strings: ListA, ListB and ListC. First 3 lines of ...
2
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0answers
1k views

Comparing percentages with unequal sample size

I am comparing the percentage of 5 areas with regards to the magnitude of poverty, income distribution, proportion of women etc. Two of the five areas are independent cities and the three other are ...
2
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0answers
94 views

Percentage increase for Treatment/Control in a cohort education study

I have some Baseline and Midline results in a treatment/control study. In trying to calculate effect size for the treatment group, I'm using a Cohen's d calculation which allows for the discount in ...
2
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1answer
434 views

Comparing a distribution of percentages

I have two populations that I would like to compare, each of which contains N samples. Each sample itself contains many events that can be categorized into 20 different, mutually exclusive, categories....
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0answers
107 views

Mean and Standard Error of True Percentages (Not Binomial Proportions)

In my line of work I occasionally deal with data on the percent lipid of fish fillet (environmental sampling). The question came up today about how to calculate the mean and standard error and ...
2
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0answers
12k views

Is it incorrect to calculate the mean and standard deviation of percentages?

My data is some percentages on how many transactions from a whole are missed each month. The percentages are for 13 months and ranging from 97 to 99 percent. I was asked to calculate the mean and ...
2
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0answers
579 views

Percentages from non binomial data: is ANOVA / Kruskal-Wallis appropriate?

I know ANOVA with percentages as already been discussed (Using ANOVA on percentages?) and (ANOVA-like test for bounded variables (percentages)), but the variables seemed different from my case. ...
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2answers
1k views

Comparing retention rates with differing sample sizes

I'm looking to compare the retention rate of people who attended an event and those who did not. The list of those who did not (70) is significantly larger than those who have (28). Here is an ...
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0answers
33 views

Comparison of categorical percentages

I apologize if this has been asked, but I couldn't seem to find an answer anywhere. I have two sets of data. Each is made up of 5 categories. These categories are ordinal as they are a 5 point ...
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0answers
34 views

Assigning weights in stat evaluation of NFL quarterbacks

I'm doing a statistical analysis of multiple former and current NFL quarterbacks to try to determine who is the best ever. Basically, I'm doing this by evaluating how much better or worse than a ...
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0answers
1k views

What kind of mean to use for a mix of negative and positive percent values?

What sort of mean can I use in calculating the average of the deviations of actuals from a forecast, which are in percent. The data look(s) like this: ...
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31 views

How do I convert a survey scale [7-point, -3 to 3] to a 7-point scale [1-7]?

I am working with a survey scale that is from -3 to 3. I have a mean value of .94 and I want to identify if there are ceiling effects, but I need to change the entire scale to 1-7 in order to ...
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13 views

Comparing percentiles of datasets of varying sizes

I am trying to build a simple anomaly detection solution. I have a dataset with normal observations. It has about a 100 values. I calculate the ...
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0answers
20 views

Need help finding correlation between output and tax rate? - Best method to do so

I am currently doing a study on the impact of a change in agriculture taxes on agriculture output. I want to compare output (volume in $) data for years 2013-2014-2015-2016-2017 in different crop ...
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0answers
32 views

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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
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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? ...
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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 ...
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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% ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...