# Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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70 views

### Modelling a percentge as a dependent variable

I have a dataset containing 4 variables: Y - the dependent variable. This is a percentage of students in a school that choose to take an external exam. The values vary from 20% to 70%. X - the ...
134 views

### Choice of transformation for my data set

My data set contains the percentage cover of various plant species, on a rocky substrate. The problem I am having is that the substrate was often completely bare of any plant life. Due to this, a ...
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### What test should I use if I want to compare 2 percentages?

I've got this hypothesis "People are better at detecting a lie when they are able to see a persons expression, compared to people that are not". I've tested 2 groups of people: 1) one group of 20 ...
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### Summarizing several percentages of uneven size samples

We are comparing the prevalence of a trait across 40 depth bins in the ocean. The notable part is that the percentage of organisms with this trait is nearly the same (80%) across all depth bins, ...
152 views

### percentages as independent variables and risks of multicollinearity

I am working on a model in which I would have percentages among my independent variables. To be more specific, I would include in the model the variables that, together, would attain a 100 (say I want ...
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### Comparing prevalence among sites. Fisher.test and pairwise.t.test

I'm studying the prevalence of one parasite on a host from different localities. I do it by assigning presence ("1") or absence ("0") to each host sampled. After the sampling, I got something like ...
619 views

### From Naive Bayes to “real percentages”

I am working on a problem which is well suited to be solved with a Naive Bayes classifier: I want to know if a certain instance belongs to a certain class. I have three attributes that can help ...
362 views

### How can standard logistic regression model fractional response variable while denominator is available?

I have X and Y variables, as well as a cluster variable (State). X and State are derived from Database A, while Y and State are derived from Database B. X is a sentiment score ranging between -1 and ...
71 views

### Comparing means of 3 dependent percentages

This is an example of the data that I have. 30 plants are a sample. Each plant has been categorized as percentage of green, brown or yellow color (percentages per plant sum to 100). For example: <...
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### T-test on percentage values (among experimental replicate values)

My experiment involves looking at the precentage of cells in a slide that have a particular property under condition A and condition B. I have one slide for each condition. I have done this experiment ...
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### 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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### 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 $A_1, …, A_n$, ...
55 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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### 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...
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### 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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### 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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### Correlation between a percentage and a real number

I have two datasets, one containing the percentage of people with flu and one which has the number of searches for Tea-recipes in google. Problem is, I get different results when i choose to include ...
670 views

### Comparing percentages from one sample and between samples

I've conducted a large survey with about 600 responders. Most of the questions were multiple choice questions. I'm interested in comparing several kinds of percentages. First, I'm simply interested ...
262 views

### Hypothesis test for summary data involving percentages

500 patients had an operation to remove stomach cancer. There exists a clinical guideline that suggests that a minimum of ten lymph nodes should be removed during the operation. I am therefore ...
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### Using glmrob function in R with proportional/percentage dependent variable

I have performed a glmrob to infer whether belonging to one of the treatment groups causes a higher % in success. I have used the following code: ...
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### Is there a signed (ie anti-symmetric) version of SMAPE?

The symmetric mean absolute percent error (SMAPE) is a symmetrized version of percent error with the formula: $$\frac{200\%}{n}\sum_i\frac{|x_i - y_i|}{|x_i| + |y_i|}$$ SMAPE is symmetric: ...
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### How do I calculate relative proportion of a fraction with respect to total value?

I have several curves in one graph (see fig.). There are 5 discernible segments within each curve that are individual slopes. Within each "x-coordinate segment" there are five samples with their ...
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### On average of percents

I have read some pages about how to calculate the average of percents. However, still I don't understand something... Assume data points are organized in the following manner: We have two categories ...
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### How to standardize count data for different sampling site sizes

I want to do a linear regression for my data but I’m not sure what I need to do with my raw data before running a linear regression. I have counts for species in several forests of differing sizes. I ...
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### 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 ...
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### How to test for differences between two distributions with percentages?

Imagine there are two distributions: Distribution 1 lists the shares of each ice cream flavor of all favourite flavors in village A: ...
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### Regression Relationship Between Fraction and Whole Number

I am trying to determine the best regression model to use to determine if there is a relationship between clicks (independent variable) (represented as a whole ...
3k views

### What is the underlying math needed to answer the following questions:

Some background: I was applying for an entry level business analyst position, and I was completely lost with some of these questions. These questions were from the practice test. I'm not sure how I ...