Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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1answer
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 ...
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2answers
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 ...
2
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1answer
104 views

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 ...
2
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1answer
56 views

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, ...
2
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1answer
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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2answers
1k views

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 ...
2
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1answer
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 ...
2
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1answer
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 ...
2
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1answer
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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2answers
2k views

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 ...
2
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1answer
121 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
103 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
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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0answers
135 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
94 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
90 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
126 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
215 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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0answers
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 ...
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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 ...
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0answers
97 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
500 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
110 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 ...
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0answers
645 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
34 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
36 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: ...
2
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1answer
15k 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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2answers
168 views

Can a percentile simultaneously refer to the % below or equal to a score and the % above and equal to a score?

I realise there are several definitions of a percentile. Recently I was given the following definition Definition 1- A percentile is the percentage of scores lower than or equal to it I was then ...
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3answers
88 views

Black Friday Staffing

Say I am running a store and I have the daily customer count for the last 5 years. I note that the average customer count on Black Fridays is three times higher than the average for the rest of the ...
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1answer
100 views

Unusual transformation of percentage data

I am reviewing some support vector machine (SVM) work by someone who has left my company. The target data is a heavily left skewed set of percentage values. He chose to make an unusual transformation ...
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1answer
49 views

Unsure on What T-Test to Use

This is is my first post on this forum - I hope it's in the right place! I am currently working on the analysis for a piece of coursework and was looking for some help with statistical test choice, ...
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1answer
91 views

How to create a frequency table?

I am supposed to create a frequency table to describe the data using 4 measures: Raw frequency Cumulative raw frequency Relative frequency Cumulative percentage I don't understand what these mean, ...
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1answer
49 views

Estimating percent change on average

Suppose I want to estimate the percent change of something over a fixed amount of time. I have some values of before and after, so I can either choose to get the average of the "before" values and ...
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1answer
29 views

Comparing the Increase of Two Values

I have a question, I apologize if it seems trivial but I just want to make sure this is correct or be corrected if not. I have a function $$f(r,x) = \dfrac{r}{x}$$ Where $r$ - is total revenue of ...
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3answers
8k views

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 ...
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2answers
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 ...
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1answer
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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1answer
34 views

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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1answer
16 views

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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1answer
53 views

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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1answer
250 views

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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1answer
89 views

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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1answer
29 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 ...
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1answer
58 views

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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1answer
100 views

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 ...
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1answer
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 ...
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1answer
392 views

what does it mean when they say some values agree within some percentage?

Maybe a silly question, as the question states, what exactly does it mean when a comparison is written in percentage? Will it be better to have let's say an agreement of 5% or 10%? In order words, ...
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1answer
4k views

How can I get an average of percentages?

I can't seem to find an answer to my exact question. I want find how much on average a stock or the stock market goes up during an up week (or month) and down during a down week (or month). Let's say ...