Questions tagged [comparison]

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Is a paired samples t-test suitable in this case?

I have 3 tasks and want to find out which one is more effective (that is, to find which task people performed better in). Just over 30 people have participated in all 3 tasks, and their performance ...
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Interpreting error bars when conducting a one-sided test

I have learned that when interpreting error bars on a bar chart, given that the sample sizes are equal (or nearly equal), that we can trust the error bars if they overlap (or not) in terms of ...
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Comparing constants multiple regressions

My objective is to compare the returns of several portfolios. In short, I have multiple independent variables (4) that benchmark returns of different market portfolios (Carhart 4-factor), where the ...
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1 vote
0 answers
31 views

How to statistically compare two numerical maps? [closed]

I have spatial temperature data on a relative scale from 1 to 0 on several days. The data sets have the same resolution, origin, and extent. How can I statistically compare them? How to identify ...
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1 answer
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How to compare variables with data from multiple experiments?

I have an experiment in which i compare the amount of attached bacteria in three different conditions. I have repeated this experimented three times, so now i have three datasets with the same data (...
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0 answers
14 views

find a suitable statistical method to analyze Yes/ No type qualitative data

I have done a survey on finding the applicability of Co- management system on a reservoir. This survey contains 8 main points. Under one main point, I included some Yes/No questions (No of questions ...
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0 answers
20 views

Relationship between normally distributed errors (bivariate OLS regression) and bivariate normality of variables (Pearson’s r)

I have forty quite diverse statistical text books at hand but I cannot find a reliable answer. I’ve studied the following and associated threads, but they didn’t got into it that deep: here and here. ...
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1 vote
2 answers
55 views

GAM: statistically comparing fit when changing covariates in gratia (R)

I am using gratia to fit a gam model such as: formula = as.formula(paste(Region, "~ s(date, k=20) + ID")) I ...
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3 answers
59 views

How to compare groups (percentage)?

I have a rather simple question, which however makes my head ache. I have country A and country B. My dependent variable is "Have you participated in training?" and my independent variable ...
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1 answer
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Combining multiple time series with unknown start dates

I have a small database of voltage information from multiple batteries (of the same type), with each measurement being a tuple of (battery id, battery voltage (as a percent) and measurement time). I ...
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30 views

What are some methods for comparing 2 separate quantile regression curves?

I am currently working with a dataset using the QuantregGrowth package in RStudio to determine the 2.5th/97.5th percentile curves of a biomarker across the age spectrum. I have a pretty good handle on ...
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1 answer
39 views

Can I compare the AME for two logistic regression modells?

I am using R Studio to run logistic regressions. I have a dataset, which analyses voting behaviour. I want to analyse the effect of different independent variables on the dependent variable "...
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0 votes
1 answer
46 views

Unbalanced control and experiment group sample size

I am working on testing the significance of a training program for businesses. We offer the training to the experimental group and want to compare some metrics to the control group. Because it takes ...
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0 answers
28 views

Checking whether improvement is significant

I am looking to compare if there is a significant improvement between two test trials. As a background: some time ago as a practise I created a simple app aimed at improving pressure force accuracy. ...
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0 answers
5 views

How can I compare the difference between a calculated values for some items with the observed and counted values of the same items? I have real data

I am looking at process improvement in a data collection effort. The current methodology involves having someone count some items with a hand counter. The items range approximately 800 - 2300 (plus or ...
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0 answers
38 views

How do I statistically compare variances of random effects obtained from two lmer models in R?

I have these three models where I am testing if time spent on the surface by fish (dependent variable) depends on their age (fixed effect), with fish groupID as the random effect. LH, RH (control) and ...
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0 answers
7 views

How to compare two personality instruments (short versions vs longer version)

I need to compare two personality instruments (find correlations). One is a short version (less items) and the other is a long version (more items). The items (sentences) in short version are the same ...
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0 answers
24 views

What are the best ranking models availble?

I am looking to compare data for example with sports teams, compare recent and historical results. I want to be able to compare any two teams when needed and also take into account a players database ...
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4 votes
1 answer
241 views

Probability that the absolute value of a normal distribution is greater than another

Greatly appreciate anyone that is willing to Help. I am thinking about the question of comparing the absolute value of normal distributions. Given $a > b$, $X$ ~ $N(0,a)$ and $Y$ ~ $N(0,b)$, what ...
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2 votes
1 answer
50 views

How to compare two quantities with uncertainties?

I've got two instruments that measure one quantity. One of them is regarded to be more precise, therefore, I use this measurement as a reference. Then, I take two measurements of the same quantity ...
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2 answers
104 views

How to compare regression coefficients for logistic regression

I have two logistic regression models that are exactly the same (same IVs and same sample) but a different DV. Is there a simple way to compare the regression coefficients between these two models? No ...
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0 votes
1 answer
17 views

I need to compare the means between total number of violent incidents pre/post intervention. Can I use paired T-Test?

I have the total number of incidents occurred within a given setting pre (e.g. 100) and post (e.g. 60) intervention and need to find out if the reduction is statistically significant. Would a paired T-...
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0 answers
23 views

Performance comparison of two models on same dataset

In short, I'm curious as to the right approach for comparing model performances. Some don't generate distributions or confidence intervals and compare point metrics. Some do generate distributions (i....
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2 votes
2 answers
94 views

Which is the most suitable non-parametric test (and post-hoc)for a heavily umbalanced groups (3, 15 and 11 observations)?

I am comparing soil properties among different geological substrates. I have only 3 observations in one category (karst soils), 15 observations in sedimentary terrains and 11 observations in ...
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0 votes
0 answers
21 views

Comparing two tables

I have two tables(9x6) with values of income at different percentiles(6) and age groups(9) for two months. I have to statistically check if the differences between values of the two month have any ...
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0 votes
2 answers
36 views

Comparing predicted results vs. actual results

I have a dataframe that spans across 6 years (2015-2020), with ~500 companies and several fundamental stats (e.g. sales, # employees, ROA). I used a span of 5 years (2015-2019) to predict the ROA for ...
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How to index and compare variables?

First of all, thank you for taking your time to read and help me with this question. I appreciate it. I have one intervention, and I measured the impact of this intervention in three tissues. In these ...
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0 votes
0 answers
21 views

Comparison between two independent variable with explained variance

I have two independent variables $X_1$, $X_2$ and a third predictor variable $Y$. $X_1$ is a superior variable to predict $Y$, but very expensive to collect. $R_\text{sq}$ for $Y\sim X_1 = 0.44$ and $...
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1 answer
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R - How to compare two correlation matrices

I have two correlation matrices coming from the same variables (divided into two groups due to the presence of a particular event). I would compare these two matrices to show the differences in ...
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1 vote
0 answers
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Comparing two distributions of R² values of regression models built using bootsrapped subsets of data?

Added more details to an earlier (now deleted) post. About whuber's earlier suggestions to look at questions about variable selection: I tried looking on the forum regarding similar issues but I am ...
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0 answers
66 views

Comparing logistic regression models from two data sets when a parameter isn't varied in one data set but is in the other

I want to determine if a logistic regression model makes good predictions for a data set not used in its fitting with a hypothesis test; I'll call it the "new" data. One could say that the ...
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1 vote
1 answer
67 views

Why is 'just' the supremum used for both 2-sample kolmogorov-smirnov test, as well as the kuiper's test, rather than a more comprehensive difference?

I am looking for a method to compare two distributions of numbers (whether they differ in underlying distribution). However, after reading thhrough respective wikipedia pages ( kuipers , 2-sample KS ) ...
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0 votes
1 answer
79 views

How to compare two texts with different order of words?

I have two texts, one ground truth and one OCR result, and I want to measure to what accuracy the result matches the ground truth. But since the text source is non-linear, both texts have a different ...
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1 vote
0 answers
25 views

Method to compare two pseudorandom number generators (PRNGs) using NIST?

I have to create two pseudorandom number generators and test which one produces a more random output using NIST. Could someone suggest a setup whereby I can confirm or deny that one pseudorandom ...
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0 votes
0 answers
32 views

Quantitatively comparing two time series

Summary: I'm trying to quantitatively compare two data series by looking at (a) the difference between the lines and (b) whether they follow the same trends Details: I have multiple time-series data ...
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0 votes
0 answers
14 views

Extract the Knowledge From Time Series Dataset

I have a time series sensor data that contains lots of sensor readings from equipments and some categorical values about equipments (On/Off/Ready, etc). I have observed that one of my sensor value got ...
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1 vote
1 answer
152 views

What performance indices are best to compare two time series with different data length . Can you suggest a method to do the comparison in R [duplicate]

I have two data sets (observed and simulated). Observed data set is the snow depth observed at a location. The simulated is the model simulated snow depth data. These data sets have different lengths. ...
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1 vote
0 answers
11 views

Comparing two distributions with relation among buckets [closed]

I want to compare the following distributions with key-percentage. dist1 = 200 - 0.1, 201-0.1, 500-0.8 dist2 = 200 - 0.15, 201 - 0.05, 500 - 0.8 dist3 = 200 - 0.1, 201-0.05, 500 - 0.85 dist1 is my ...
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-1 votes
1 answer
76 views

Comparing percentages of incorrect answers - is a t-test appropriate?

In my study, I asked participants to recognize an emotion (they were listening to an audio recording). Only one answer was correct, but the response scale included seven options. I calculated total ...
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2 votes
1 answer
85 views

How to compare paired qualitative data?

I would like to compare two methods on qualitative and paired data. To summarize my study for you (it's for an internship), I have activity values ​​that were measured on 13 sites, for 12 species of ...
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1 vote
1 answer
222 views

R: Pairwise t-test, specific order of comparisons

...
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1 vote
1 answer
33 views

Overlapping quinquennial data - How to compare?

I actually do not know if this is the right place to ask, but I hope someone can help me. I have a dataset that provides the number of newborns in quinquennial periods. For instance, I have the number ...
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2 votes
1 answer
144 views

McNemar's for 1:N Matched Pairs (for N>1)

Sorry for the ignorant question, but I have 1:4 matched pairs data. I am trying to understand how one would run a McNemar's test in this situation, or if it would even be possible. Each case is ...
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0 votes
1 answer
23 views

Comparison gender differences smoking

I am trying to answer a somewhat explorative research question, with the goal to assess whether depression (never or previously/currently) significantly changes found gender differences regarding ...
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1 vote
2 answers
86 views

Comparing means and medians (with different dispersion indeces) from different studies

I'm doing a systematic search and I have a pool of articles that for each outcome report different central values (mean and median) and dispersion indices (SD, 95% CI, IQR). Is there a statistical ...
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0 votes
1 answer
158 views

Test for comparing x-intercepts of two linear regression

I would like to know how to compare, and then calculate significant differences, if any, between the x-intercepts of two regression lines. Practially, I shoud compare the values of x when y=0. I know ...
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0 votes
1 answer
27 views

How best to determine student improvement before and after multiple tests?

I have the following situation in my hands: I have 13 students who have undergone skills training. Their performance has been evaluated on a scale of 0-100 using 14 different exercises, before and ...
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1 vote
0 answers
88 views

Compare data from two experiments within single logistic regression to determine effect of experimental design?

I've run two studies. Study 1 (N = 112) examines the effects of two variables (A and B), each of which have two levels (a1, a2; b1, b2). For each variable, I'm interested in the effect those different ...
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2 votes
2 answers
30 views

How do you compare regression slopes of two groups that are distinct in terms of the indepdent (x) variable?

I have two sets of biometric data: one from fetuses and one from new born infants and am comparing the biometric measure (eg. head size) against the age of the baby. However, the two groups are ...
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1 vote
1 answer
42 views

How to compare proportion of a category in a sample vs its proportion in a population

No. of observations in the dataset = 19,277 There are 2 features : Country & Job role. There are 5641 respondents from a country, India. There are 5171 respondents that are students. Of the 5641 ...
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