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Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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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 ...
4
votes
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 ...
4
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0answers
5k 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 ...
4
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0answers
550 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 ...
3
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0answers
66 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 ...
2
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0answers
36 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 ...
2
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0answers
70 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 $A_1, …, A_n$, ...
2
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0answers
45 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 ...
2
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0answers
92 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 ...
2
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0answers
180 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. ...
2
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0answers
43 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
90 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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0answers
103 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
536 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. ...
2
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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 ...
2
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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 ...
2
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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: ...
1
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0answers
24 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 ...
1
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0answers
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 ...
1
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0answers
19 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 ...
1
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0answers
26 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 ...
1
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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 ...
1
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0answers
82 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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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
60 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
72 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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86 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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0answers
68 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 ...
1
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0answers
909 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% ...
1
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0answers
34 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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0answers
22 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 ...
1
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0answers
95 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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0answers
507 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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53 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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0answers
87 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
431 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
124 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, ...
1
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0answers
94 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
97 views

Should I treat my data as ordinal or interval?

I conducted a survey where I asked respondents how much they reduced their financial overhead, based on the following options: 0% (coded as 0 in my dataset) 1-10% (coded as 1) 11-25% (coded as 2, etc....
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0answers
513 views

how do I compare percentages and show they are significantly different?

Here is my data: I have two groups (experimental group and control group)voting for 6 different actions, listed as A, B, C, D, E, F. The sample size of the 2 groups are different. Therefore, I am ...
1
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0answers
11k 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 ...
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0answers
62 views

“Controlling” for population/sample sizes when looking at rates?

I have a pretty basic understanding of statistics, so please bear with me: I'm making an index (ranking) of sector performance I am including indicators such as "Percent of profitable firms in sector"...
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0answers
134 views

Can you calculate descriptive statistics (SD, SE particularly) from percentages and ratios?

I'm a cell biologist and a lot of my data is expressed as a fraction (percentage) of the total number of cells in a single experiment in a number of separate categories (generally 5 or so). The number ...
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0answers
926 views

Regression with percentage change?

As the education rating of a Canadian city decreases by $1\%$, the crime rating will change by ___ (make sure you include the negative sign if warranted) The line of the equation I found to be $\hat{...
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0answers
472 views

Should descriptive statistics on percentages data be weighted?

I'm trying to put together descriptive statistics for a set of differently sized groups of students. For each group of students, let's say I know the # of students who are left handed. I'd like to ...
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0answers
49 views

how to compare groups and percentages within

I am new to statistics and would really appreciate help. The people within the groups are different - how do I compare the percentages to see if there is a statistical significance between the groups ...
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0answers
181 views

How to model overdispersed percentage data?

this is my first post so let me know if you need more information. This is a pretty general question for now, but I am not sure how to approach this. The data I have is from an ecological study. In ...
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0answers
716 views

ANOVA on percentages

Please read edit 3 first I am trying to find out the significant factors in a dataset of percentages, a sample of which are below. The difficulty is that the data violates the assumptions of ANOVA, ...
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0answers
453 views

Comparing Percentages Between 2 Groups When Each Group's Total Percentage Exceeds 100

I am comparing the rate of specific Response Patterns A through L among students in Group 1 vs. Group 2 (rates for the first five patterns are exemplified in the table). These are response patterns ...