Questions tagged [statistical-significance]

Statistical significance refers to the probability that, if, in the population from which this sample were drawn the true effect were 0 (or some hypothesized value) a test statistic as extreme or more extreme than the one gotten in the sample could have occurred.

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19 views

What statistical test should I use with count data?

In my experiment, participants are shown 4 images (A, B, C, D) that they have to rate on a 5 point scale. So my data looks like this: particpant1: A 5, B 3, C 3, D 1 p2: A 4, B 3, C 2, D 4 p3: A 4, B ...
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I have to independent variables (both are continuous) and one dependant variable (categoical). Which test can be used to analyse?

I have to independent variables (both are continuous- il-6 and e-cadherin levels) and one dependant variable (categorical- ca ovary). Which test can be used to analyse?
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Runnning a pearson's correlation for two variables that change from a third factor [closed]

I have a covid-19 dataset that I'm trying to analyze. This dataset is a time-series dataset and has many columns such as Date, number of new cases, and number of new vaccinations. To find out whether ...
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Categorical ordinal data: which test is better?

I have the following data: Group very bad bad quite good good very good A 12 20 11 29 14 B 20 10 6 11 34 Group A receives training, group B doesn't which test is appropriate for this kind of data?...
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Statistical Significance of survey

I recently conducted a survey comparing the generated responses of 2 chatbots. Each participant was asked to complete two tasks: Select a generated response as "best" between 2 generated ...
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Compute-intensive randomized *unpaired* t-test (without paired samples)

Yeh 2000 section 3.3 cites Noreen (1989) and Cohen (1995) for compute-intensive, versions of paired t-tests, which are stonger because they don't make parametric assumptions. However, these tests ...
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How accurately would the approval rating polls predict the election outcome? [closed]

How accurately would the approval rating polls predict the election outcome? When Trump consistently had a 10% margin of likely voters against him wouldn't this sufficiently prove that he lost fair ...
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Is this a valid method to test textual difference?

For some research I am trying to reject/ not-reject the null-hypothesis that the proportion of a word is higher in a certain sample of a text than in the rest of the text. The full text is a ...
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Interaction of Gender and Income categorical variable

I ran the following model, with exam scores in science as my outcome variable, and parental income group divided into 5 groups and a binary gender variable with the results below: ...
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Statistically compare accuracy of several CNNs | data independence & k-fold crossvalidation

I want to set up several CNNs, give them different input data (e.g. an nDSM or an orthophoto) and then test, if the runtime and the accuracy are significantly different from each other. How can I ...
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Find significance in pairwise comparisons when not explicetedly reported

I am interested in the reported statistics in the paper https://www.tandfonline.com/doi/full/10.1080/09602011.2020.1715231. To my understanding, they do not report explicit pairwise comparisons, see ...
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Compute a Monte Carlo estimate. Which of the variances (of $\hat{\theta}$ and $\hat{\theta}^{*}$) is smaller, and why?

Compute a Monte Carlo estimate $\hat{\theta}$ of $$ \theta = \int_{0}^{0.5} e^{-x} dx $$ by sampling from Uniform$(0, 0.5)$, and estimate the variance of $\hat{\theta}$. Find another Monte Carlo ...
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Comparing significant differences between a linear regression on same data coded as ordinal or interval

I'm running linear regressions in R on some survey data that was delivered as Likert-scales. In R, I can code them as factors (to represent them as ordinal data) or numeric (to represent them as ...
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Best statistic to compare disease appearance in two distinct groups

I have two distinct groups made of a different numbers of subjects (111 Millions and 126 Millions). My goal is to evaluate how many subjects in the two groups encounter 10 different diseases. For this ...
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Best test to use for investigating if the difference between means is significant?

I'm studying the length of stay for patients in a hospital. I have a sample of n=4533 observations. Each of these observations are assigned to an admin group numbered between 1 and 8, based on the ...
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find general solution of PDE [closed]

I'm a newbie for mathematics and now I'm learning PDE and stuck on that. Could anyone help me out to understand this elimination from PDE. The equation is similar to solve r + s -6t = e^(2x+y) + sin(...
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What is the minimum number of samples that you need per group in a Western blot in order to perform a hypothesis test?

I am doing Western blot data analysis and I have 2 groups of values. I want to perform a statistical test to compare the means of the two groups to see if there is a significant difference. I am ...
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Solve Partial Differential Equation [migrated]

I'm a newbie for mathematics and now I'm learning PDE and stuck on that. Could anyone help me out to understand this elimination from PDE. The equation is similar to solve (D^2 -6DD'+9D'^2)u = ycosx
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How to interpret discrepancy between confidence interval and p-value

My main statistical model returns a significant treatment effect with a p-value below 0.05. Usually, this means that we can reject the null hypothesis that the treatment effect is zero. However, the ...
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34 views

Statistical tests for a population mean of a random variable with an unknown distribution

I have some data whose distribution is a priori unknown. A Q-Q plot shows that the distribution has fatter tails than a normal curve, and when I look at some samples I have available, the excess ...
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27 views

T-test to test if sample comes from the same distribution?

I have a small dataset, sample size of n = 25. These samples form a distribution that looks normally distributed, let's call this distribution Y. I also have a different sample let's call this sample ...
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25 views

Determine observed t from 2 means from set of values

"A study was conducted to compare the costs of supporting a family of four Canadians for a year in different foreign cities. The lifestyle of living in Canada on an annual income of 75,000 ...
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Finding the statistical significance of a Matthews Correlation Coefficient (MCC) in binary classification (what is a good MCC)?

I have a very imbalanced dataset. Thus, I am using MCC to evaluate the performance of various ML algorithms. It appears that literature is entirely lacking in ways to evaluate how good an MCC score is....
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23 views

significance test for average distances?

I have many measurements of distances between places. Say, distances between a school and selected houses in different cities. I want to compare the distribution of distances across cities. I want to ...
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47 views

What model should I use to prove statistical significance?

I'm wondering what method should I use to prove that the trend below is statistically significant? I want to prove that employees are less satisfied with an event, the longer they have been with the ...
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How to find outlier data points on a log-gamma distribution?

I’m dealing with a correlation network (only positive values) with M nodes where I’ve grouped features by N categories and ...
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1answer
32 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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22 views

How to perform this test for the fairness of a coin?

Suppose the task is to test whether a coin is fair (i.e. has equal probabilities of producing a head or a tail). If the coin is flipped 100 times and the results are recorded, the raw data can be ...
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How to carry out the hypothesis test in this example from wikipedia?

This is an excerpt from the wikipedia article on test statistics: Suppose the task is to test whether a coin is fair (i.e. has equal probabilities of producing a head or a tail). If the coin is ...
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Chi Square Test on small sample size

I have the following dataset and I am trying to run a Chi-square test between the control and pilot. The only issue is that, for a Chi-Square test to return proper results, the sample size need to be ...
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How to test whether or not a category (month) affects a continuous distribution (latitude, longitude)?

I am trying to answer a question as to whether or not the month of the year affects the geographical distribution of hurricanes in the Atlantic ocean. I know for example about hurricane season, and ...
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2answers
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Find relation between Categorical dependent variable and continuous independent variable

I have one sample group of data where I found the difference between two categorical data (this is my dependent variable) and continuous - numerical data (this is my independent variable). I want to ...
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Statistical data analysis [duplicate]

I'm currently facing some issue in determining what statistical test might be best to adopt to determine whether or not three datasets are significantly different from each other. I have the following ...
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Statistical data analysis - data comparison [closed]

I'm currently facing some issue in determining what statistical test might be best to adopt to determine whether or not my three datasets are significantly different from each other. I have the ...
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Independent samples t test for following up missing data - inadequate sample size

I'm running a missing data analysis in SPSS on a data set that examines correlations between an IV and five DVs (all continuous variables). Seven of the participants were inadequately sampled, so I'm ...
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22 views

Statistical significance between two groups of different size

I'm trying to test statistical significance on a sample of two groups that I have, but I'm getting tripped up over the details: I have a sample of 30 days of Group A and Group B. Events in group A and ...
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Finding region of rejection with likelihood ratio test

Let $X_1,\ldots,X_n$ be i.i.d. from a Gamma distribution with p.d.f. $f(x;\theta) = \theta^{-2} x e^{-x/\theta}$ for $x>0$ where $\theta$ is an unknown parameter. I would like to test the ...
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What does asymptotic significance value less than 0.95 tells when results are already significant with 0.05 value? [duplicate]

I am relatively new in statistics and it is also not my major. I am just using it due to the need. I have used the SPSS tool to establish the statistical significance of two or more scales between ...
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What's the difference between CMH-test, mixed model and regression with covariates, wrt. accounting for stratification

I am working with some data, in which I would like to see if there is a gender specific effect. My data consist of individuals with many covariates and a dichotomous outcome. I have three different ...
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9 views

Correct Statistical Test for process change

I have a manufacturing process that should result in a 45. I have sampled the output 20 times and recorded the results, made a change and sampled it 20 more times. The goal of the change was to make ...
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16 views

Significant difference/ANOVA test when some values occure only once

I have fake dataframe with neighbrhood codes and prices of houses in those neighbrhoods, with this amount of values for each negihborhood: ...
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Mathematically explain web servers uptime

I want to mathematicaly explain a set of servers based on their uptime. Some computers they are constantly running and some of them they go off and on over time which their off time and on time can be ...
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statistical test to compare proportions

This question might be basic so i'm sorry in advance. I'm doing an analysis trying to compare differences in proportions of two different groups (A and B) according to if they stayed on the same ...
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1answer
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How to look at the statistical significance/insignificance in regression tables without asterisks or p-values?

I am reading some papers where regression tables are shown, but I could not find where statistical significance is reported for the coefficients. The authors only discussed the significance in the ...
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756 views

Significance test for two groups with dichotomous variable

I have a 2x2 table with two independent groups of people that replied Yes or No in the survey: Yes No Group A 350 1250 Group B 1700 3800 Could you help to find a test that can be run on these ...
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Variables non-significant in univariate analysis but significant in multivariate analysis? [duplicate]

I am running Cox regressions on a data set and I have encountered a situation where two of the variables are non-significant in univariate analysis but become significant in the following multivariate ...
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correlation between dependent variable and instrument

I have an additional question to the issue of correlation between dependent variables and instruments - which i have some problems understanding. I'm estimating a model by IV due to endogeneity in a ...
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28 views

Which statistical test is most suitable for comparing temporal abundance data?

I am looking to compare differences in density of individuals of a species of zooplankton. I have calculated density for every meter from 0-100m, for four different time periods. As such, I have an ...
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29 views

Finding the complete and sufficient statistic T for θ [closed]

I have to find the sufficient statistics for the Poisson distribution for the probability function: I have already solved for MLE where: and know that MLE is equal to the moment estimate. I have ...
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37 views

Joint significance test in a difference-in-difference setting

I ran following difference-in-difference regression in software and have some questions about the interpretation of the resulting coefficients and their (joint) significance: $$ P_{it} = \gamma_i + \...

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