Questions tagged [percentage]

Number or ratio expressed as a portion of 100

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Representing growth in learning outcomes

The average score of my class of students at the beginning of the year was 50/100 and at the end of the year, it was 80/100. The percentage growth is 60%. Can I write there is 1.6x growth in average ...
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Does it make sense to describe change in Pearson's correlation coefficient in percentage terms?

I am facing a situation where the correlation changes from .7 to .5 from time 1 to time 2 for data A and the corr changes from .3 to .1 from time 1 to time 2 for data B. The absolute magnitude of the ...
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How to compare real-time physiological data between pre-defined time blocks

I have a set of physiological data (skin conductance, skin temperature, heart rate) for approx. 20 patients measured per second over approx. 8 to 10 minutes during a virtual reality exercise. The data ...
1 vote
45 views

Can you use a percentage as the dependent variable in general additive models?

This is more a general question about statistical modeling rather than a project specific question. Can the dependent variable be a percentage in a generalized additive model (GAM)? Is there a ...
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Linear regression: interpret coefficient in terms of percentage change when the outcome variable is a count number

I have a linear regression, where Y is a count number. Y = a + b1X1 + b2X2 I know we can interpret b1 as: a unit increase in X1 will change Y by b1. But how can I ...
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Post-hoc tests for a Generalized Linear Mixed Effects Model

This question is linked to this one. I wanted to know whether the application of a treatment would have a significant effect on the proportion between healthy leaves and infected leaves. I have the ...
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What statistics to use compare many (dependent) ratios

I'm trying to compare the cellular subpopulations of the thymus of transgenic mice. I identify the cells with flow cytometry, and I get results similar to this: Cell type Mouse strain 1 Mouse strain ...
16 views

How can I justify using counts plus offset in a Poisson or NB model instead of "percent of total"?

I have count data that is part of a whole. It's not compositional, because the other parts of the whole aren't of interest. I could analyze it as a "percent", but I would rather do it as ...
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1 vote
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Statistical test of increase between groups in two time periods (categorial data)

I would like to check if percentage change between the groups and time for binominal variable is significantly different. What test to use? In Group A (n = 1000) in t0 we had a 10% share that ...
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Combining percentages to estimate new percentage

I am trying to estimate the proportion of the true freshman cohort (first-time, full-time, degree-seeking) who declared an undergraduate-level college major in their first year of college by their ...
1 vote
43 views

How to handle past “unknown race” category when comparing current student demographic percentages to those in the past? [closed]

When comparing current student demographic percentages to those in the past how do you handle the past “unknown race” category? For the years with students in the unknown category, how do you ...
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Can I aggregate several continuous variables into percentages and then compare those percentages between groups?

I have a dataset with the concentrations of several lipids. I'm interested in finding lipids that are altered between two conditions, but the lipids are not indepentent from each other and the ...
1 vote
145 views

GLMM for percentage response variable

I have a completely randomized block design with 4 treatments and 3 replicates per treatment (12 parcels). Each replicate is placed within a block. In each parcel I have measured the number of ...
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Calculating and displaying variation of sub group responses within larger group

I have a question with 3 possible answers (yes, no, unsure), and I have the responses of two groups. Group A and group B. Group A has three sub-groups (A1, A2, A3), Group B has two sub-groups (B1, B2) ...
• 1
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How do I interpret a negative relative standard deviation and a relative standard deviation greater than 100 in this example?

I have the following astronomical data data1vcoord =array([[ 709.4497, 1500.3387, 1573.9434, 292.9126, 930.4643], [1423.7768, 1242.1892, 407.6168, 346.3528, 541.8568]]) data10vcoord=array([[ 718....
45 views

What would be the most appropriate distance metric for percentage/ratio data?

I have a matrix where each row is an observation (i), each column is a feature (j), and each value is the ratio the feature j is complete in observation i. That is, the values are floats that range ...
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Help determining which statistics to use

Forgive me as I am a novice. I have done a training for a group and wanted to calculate some stats on the percentage of improvement of knowledge and understanding based on participant survey answers. ...
112 views

Difference between Probability and Effects in Logit Models

when I run a logistic model I get log odds that I can easily convert to probabilities. What I don't understand is how can I use percentages instead? Here's the code: ...
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How can I calculate a relative measure of change for data series that can include zero?

I have a series of data points representing the number of OKs for a test. For each data point, I want to calculate by how much its value changed compared to the preceding value, and I need this ...
19 views

Contribution of a single value in a Division of Sums

I need to isolate contribution of a single entity in a Division of Sums as shown below. For example, find the contribution of variable a in the following: (a 1 + b ...
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How to test for significant differences among percent increases between two unbalanced samples from each of 10 treatments?

I am trying to figure out how best to analyse fruit weight data from an experiment involving samples of both open-pollinated and unpollinated fruit from each of 10 different pollination treatments. I ...
31 views

Log Transforming variables already in percentage [duplicate]

I'm running a regression analysis and I'd like to know if log transforming a percentage value is ok. My y-values are already in percentages and my x-values in absolute numbers. But I'd like to know by ...
34 views

One Way Anova giving wrong P value

I have 8 columns of data for cumulative percentages and I performed one way anova. I know 4 sets of the data are statistically different because it is someone else's research data. When I added my own ...
48 views

GEE Using a Bernolli Model and Log link

Conceptually I am interested in a pretty simple question: Do screening rates (dichotomous outcome) differ between an intervention and control group. We have a number of clinics that patients are drawn ...
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216 views

How to convert standard error of the mean (SEM) into a percentage change

I have performed a t-test between groups, but I only have Mean, SEM, and N. Now I would like to look at the percentage change between these two groups, and compare this percentage change to another ...
172 views

Can ANOVA suffice for comparing mean of percent/proportion data?

I've been handed off some data to analyze and I'm looking for something simple and straightforward. The 1 response variable/dependent variable is average percent mortality from 7 treatment groups (...
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Valid to calculate standard deviation from percentages?

I'm writing a program that shows data about groups of entities. In each group, the entities make contributions to a goal. I'm interested in how even the contributions are distributed between the ...
51 views

Which statistical test to use for percentage data?

I am struggling to determine which test to use to compare the percentage data derived from continuous data. I am studying specific sleep characteristics in the context of depression. I have a ...
1 vote
42 views

Do I have to redo my meta analysis?

I did a meta analysis of percentages using metamean in RStudio. Should I have used metaprop instead? For the SD argument in meta mean I used the SD for the binomial distribution.
1 vote
141 views

Interpretation of coefficients in fractional response (probit) model

I am learning about the estimation of fractional response models (those with a lower and upper bound, say 0 to 1), using Stata. I came across this example on the Stata page, which I'm copy-pasting ...
35 views

Significance disagrees between raw count z-score and percent change CI

I am estimating the difference between quantities of owned homes in particular census tracts between ACS 2021 5 yr estimates and ACS 2016 5 yr estimates. I'd like to know if the quantities of owned ...
• 1
23 views

Weighed average (percentage) depending on the number of facilities in each given region

I have 10 regions with facilities (different number of facilities in each region) that test people for presence of condition A. However, there are also facilities, that were included in the pilot ...
1 vote
76 views

How to transform percentage cover data into species abundance data in algae

I have collected percentage data for Rocky shore and summarised it per algae type like the example below: ...
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1 vote
260 views

How to calculate effect size based on percentage and sample size?

In an intervention study, I have the following information - % of students passing an exam pre- and post intervention, sample size for control group and intervention group at pre- and post ...
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How to test for a difference in the mean percentages of two populations

Many questions seem to ask something similar, but I could find none that seemed to really match. Suppose there are two potentially distinct archaeological cultures "East" and "West"...
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1 vote
48 views

Calculate a mean percentage

I have some percentages calculated as follows: 8/51 = 15.69 12/91 =7.19 12/167 = 13.19 Is there a way to calculate a mean percentage taking into account that the denominator differs? Thank you in ...
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1 vote
14 views

Test that observed percentages differ from theoretical distribution (e.g. 50%)

I have a series of independent measurement of a percentage of binary events. (e.g. 60%, 65%, 55%, 59%, 60%). How can I test that the observed distribution is different from a theoretical of 50%.
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Scaling by percentage - is this appropriate given this situation?

Let's say I have a range of formulations, and each formulation contains a different starting rate of water "x", and I want to test how fast the formula dries out over time (ie. loss of water ...
59 views

How to compute sample variance and/or mean square error as a percentage?

Say I have a set of measurement values $y_\text{m} = (y_{\text{m},1}, \dots y_{\text{m},N})$, and compare these with some ground truth $y = (y_1, \dots y_N)$. Then, if I understood correctly, I can ...
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26 views

Tools for reporting sample size that contains the percentage of the population

If we have a recorded percentage (statistic) on a population, if we take random samples we might not encounter the percentage till e.g. even we exhaust the population. E.g. a box with $500000$ balls ...
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1 vote
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Is my logic about comparing the 70th/90th percentile from two respective datasets correct or is there a proof to do this?

Larry and Tony work for different companies. Larry's salary is the $90th$ percentile of the salaries in his company, and Tony`s salary is the $70th$ percentile of the salaries in his company. Which ...
1 vote
18 views

Formulation of percentage difference

I have calculated true positive rate (TPR) for two tests. I want to report the % difference for test b compared to test a. This is very simple, however, I have gotten myself confused as to how to ...
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1 vote
116 views

Regression Analysis for Proportional Data

I am going to try to simplify the context of my analysis into an apples/oranges scenario. I have 30 baskets, each with 10 fruits. The 10 fruits are made up of a number of apples and oranges. Each ...
• 13
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Chi-square test, McNemar test, or something else for comparing proportions of overlapping groups

Goal: I am trying to compare the proportion of participants who choose one of the combined options (A-B and B-A) in questions where they see A-First vs questions where they see B-First. Data: I have ...
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1 vote
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F-test can be used to analyse discrete data?

I have 2 sets of discrete data. My objective is to compare 2 different process which is manual strip and auto-layering machine. But my data are in percentage of scrap. Can I use F-test to analyse the ...
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Which type of regression can be used to calculate the relationship between zero-inflated percentages and a continuous variable?

I used spearman correlations to test associations between relative abundances (percentages of each microbe present in each sample) of certain microbes and continuous variables. Many people have zero ...
98 views

Binary logistic regression and percentage change variable

I am a student approaching binary logistic analysis. I was wondering whether the independent variables used in the logistic regression can be expressed in percentage changes. If yes, How to interprete ...
58 views

Comparing percentages!

Here is the problem I need help with, I have two stem cell lines (line A and Line B). These cell lines were generated from one source. I have six flasks, three of the flasks contain cells line A and ...
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1 vote
16 views

Percentage of rate reduction

I have two rates (# of incidences per # of visits): older - 2.33 newer - 1.33 Would it be appropriate to say that the rate was reduced by 43 percent ((1.33/2.33)-1)?
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