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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combine normal and binomial probability distributions

Asume we combine 2 sets of data properly. one set has normal destribution and another has poisson or binomial destribution. Can we define a new destribution for new population? How can we estimate ...
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23 views

Which stats tests to use? Bee flight activity quantified during an eclipse

I'm trying to perform a statistical analysis but not sure what test is most appropriate. The experiment and snippet of sample data are below: Methods: Bee flights from a beehive were recorded, ...
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27 views

Unrealistically high significance when marginalizing over large number of parameters

The setup I've tried to reduce the problem to a self-contained subset for this question, but it still ended up being pretty long. Sorry about that! I have a set of observations of a set of objects ...
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1answer
21 views

Frequency significantly different from zero

I've got a few frequencies, and I'm trying to work out if each of the frequencies is significantly different from zero. Most of the frequencies I can eyeball, but I wanted to have some for of ...
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13 views

Statistical significance test for confusion matrix

I have a doubt regarding, which statistical significance test to apply on a confusion matrix. Say for example there is a two class classification problem. The confusion matrix is given as follows: ...
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12 views

Role of Chi inverse distribution in the confidence interval of standard deviation

Suppose X = [11.17, 9.52, 10.69, 9.84, 10.84, 9.88, 10.28, 12.23, 18.4] is a random variable with mean and standard deviation as 11.48 and 2.77, respectively. If I calculate the lower and upper ...
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6 views

Spambase Naive Bayes

i'm wondering about spambase which was created by Mark Hopkins, Erik Reeber, GeorgeForman, et all. how is the method for pick each word for attribute comment. Can somebody tell me the journal because ...
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0answers
17 views

Sample an Interval on Continuous Variables, Intervals, Statistical Significance, Sampling - Applied Stats Question

Let's say I have a segment of pipe of length $X$ that I want to test the integrity of by way of a hydrostatic pressure test. That is, I isolate the ends of the pipe and pump water into it until it a ...
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3answers
46 views
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5 views

Statistical significance for occurrence of words in text classification?

I am looking for a statistical significance to test to assess the occurrence of words in text classification for the different classes. Assume we count the number of occurrences of words per class and ...
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21 views

Testing for statistical differences of quantile regression line slopes

If I were to compare the statistical similarity between the slopes of OLS regression lines from two independent samples, I would use a t-test to test if the slopes are equal or not. I'd like to ...
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1answer
38 views

Can the endogenous variable be insignificant while the instrument is significant?

I suspect that this is entirely possible since the endogenous variable coefficient can biased in many possible way, thus leading to a near 0 estimate despite having a real causal relationship. More ...
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2answers
67 views
+50

Network centrality in a set of networks with shared nodes

I have a set of weighted networks, each represented as a complete graph composed of nodes and connections with weights (see also "weighted networks" on Wikipedia). All networks share the same nodes ...
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22 views

regarding skip the intercept term once it is not statistically significant [duplicate]

After building the regression model, the intercept value is not statistically significant Is that reasonable to just skip it in the final regression model?
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1answer
21 views

Performing significant difference tests in endline evaluation

we have conducted an endline survey and now comparing the result with baseline survey. I am interested to find significant difference between baseline and endline. One of sample questions is given ...
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0answers
6 views

post-hoc testing in clustering analysis 1 feature

I've read that a post-hoc testing of the results of a clustering analysis is incorrect to perform. If I understood well this is true if the data are multidimensional and the purpose is to find out ...
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1answer
36 views

What statistical analysis should I use for my study?

In my psych class we were testing to see if groups of men or groups of women would be more helpful in an emergency situation (we are testing for the bystander effect), and we are testing to see if ...
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33 views

How to statistically validate a threshold?

I have a set of 3 parameters that were measured for several individual (each dot of the dotplot is one individual). I am trying to define subpopulations of individuals based on these measurements. ...
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0answers
14 views

Regressions and statistical significance [duplicate]

Why does the statistical significance of the variables in a multiple regression lower compared to individual simple regressions?
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1answer
42 views
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1answer
47 views

linear regression

I am reading a paper and come across the following information: ...
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21 views

the reason that adding one more predictor variables will cause lm model to be all NA

I have a data set with multiple predictor variable candidates, and try to experiment with different combinations. During the experiment process, I tried using the first 9 variables, ...
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2answers
45 views

Why do we compare p-value to significance level in hypothesis testing of mean?

I know that: p-value = P(observed or more extreme outcome of sample mean | Null hypothesis is true) But why do we compare it with significance level (alpha) while determining if it is high or low? ...
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1answer
23 views

Earliest significance in A/B test

I'm working on a problem/assignment where I'm given some activity logs from a website where an experiment was conducted. I'm asked to determine the earliest time when a statistically significant ...
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0answers
11 views

When is appropriate to combine two treatment groups from one study into a composite whole for a meta-analysis?

The treatment groups I would like to combine appear to be virtually the same, at least by generic label for each group, e.g., groups with the same treatment but implemented at different sites or ...
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0answers
19 views

Statistical test for Comparing 6 classifiers over 5 datasets

I did the Friedman test to compare 6 classifiers which are tested over 5 datasets. The null hypothesis was rejected so I proceed with the post-hoc Bonferroni. The X classifier is always first on all ...
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1answer
34 views

How to calculate sample size for this study design?

I am trying to find out whether the number of participants I recruited (N=42) so far is sufficient for my study in which: there are two interfaces (say A and B). ALL students in the study will try the ...
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34 views

Effect of binary variables on binary outcomes

All I have two sets of data. One where people bought and another where they did not. For each sample in the two sets, I have ~3000 binary independent variables. Each dataset has about 1000 samples. ...
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20 views

Hypothesis testing on groups of time series data

I have some experimental data from two groups, where each group contains data from $n$ subjects. The data are in the form of a time series for each subject, but are not all the same length. To be ...
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14 views

How to determine significance across categories of binary data?

I have subjects that fit into one of three, mutually exclusive groups, "favorable," "intermediate," and "unfavorable" based on their genetics. They can then be classified as either a "responder" or a ...
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19 views

Can I use K-S test to distinguish distributions?

I am using the kolmogorov smirnov test to differentiate between distributions. My example is below where I am comparing DATA2 and DATA3 to DATA1. From the image, I was hoping to quantify that DATA1 ...
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9 views

Need Insight on Measuring Variable Effect

I apoligize in advance for the wall of text. I'm working on a project in which I have been asked to determine what factors influence employees leaving our company. Also, it would be useful to be able ...
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1answer
48 views

Exact two sample proportions binomial test in R (and some strange p-values)

I am trying to solve the following question: Player A won 17 out of 25 games while player B won 8 out of 20 - is there a significant difference between both ratios? The thing to do in R that ...
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36 views

calculate statistical value of the mean of a mean of a mean

EDITED FOR CLARITY Hello, Considering the picture below each values X could be identified by the indeces X_g_s_d_h ...
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10 views

Nested Anova for same group of participants

I am dealing with the following problem. I want to compare how some geometric measurements from the same participants can be connected with the existence of a disease. So the nested anova should like ...
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0answers
3 views

Gibbs sampling scheme on Ozone35 data set [migrated]

I'm attempting to run a Gibbs sampling scheme on the data set Ozone35 from the BayesVarSel package in R. Here is the info on the data set Ozone35: ...
2
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1answer
69 views

Wrong Intepretation of Kruskal Wallis Test in R

I have some data (called egecNonmated) in R and I am trying to show that the distributions of a variable (MatchScore) are identical across three different Categories (Cat). I am using a box plot to ...
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1answer
46 views

How to prove the siginicance difference level in this data?

I have collected a set of data of 52 weeks of actual output and demand. Actual 1100 1300 1400 1500 1600 1100 1200 1600 2100 1300 1600 1300 1600 2200 2300 1700 1800 800 1400 900 2100 1400 1800 1900 ...
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1answer
25 views

Bootstrap significance test

I'm using the bootstrap method to test my experiment results for significance. I have two sets (say A & B) of 50 grades, for which I want to test whether their means are significantly different. ...
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26 views

Median confidence interval

It is asked to prove that if $X_1,...,X_n$ is a random sample from $X \sim U(\theta -1/2, \theta +1/2)$, then $$P( \theta \in [X_{(1)}, X_{(n)}])=1-2(\frac{1}{2})^n$$ Note that $\theta$ is the ...
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1answer
21 views

How to find three probabilities with two different values or ratings?

I would like to know how to find three probabilities of two values.... Specifically...I want to know the three soccer venues (HOME DRAW AWAY) proabilities with two ratings... Example: I have two ...
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22 views

Can I determine whether two quadratic slopes differ significantly?

I know that there are ways to compare two linear functions to determine whether the slopes of the functions are significantly different. However, I'm wondering whether there is any way to compare ...
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1answer
24 views

Determine whether something is “significantly maximal”

The problem: I have a measure $D_i$ that quantifies how well a single target "feature" can be predicted from a set of (other) features $i$ (similar to an AUC). $D_i$ is computed based on a set of $n$ ...
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15 views

Odds of a team winning a sports match given full history

Assumptions: The teams never change The teams don't improve in skill The entire history of each team's performance against some subset of other teams is known For example: I have a long list of ...
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45 views

Significance testing of categorical variables - is chi squared as good as it gets?

I am testing categorical variables for significant relationships, 5 age groups and 3 answer options (yes/no/don't know). Is there a test which will specifically tell me if e.g. age group 1 is ...
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32 views

Statistic T-Test & T-table

Hi can anyone help me with this question . Thank you! I know that for part (a) degree of freedom is 13. But how do I use the t-table to answer (b) and (c). The t-table is below
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11 views

statistically analyse pass rate of test in different locations

I'm looking to analyse some data and as it's been a long time since my statistics days I'd like to know which area of statistics my problem lies. Lets say I have a number of different driving ...
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1answer
29 views

backward selection but regression coefficients not significative? [closed]

I'm running a logistic regression with backard selection method. I get coefficients with p-values>.10. Here's an example: ...
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0answers
20 views

Should I check the z-score if the p-value of Local Moran's I is significant?

The dataset I'm using contains income data per area. The values are not normally distributed as shown in the following diagram. Global Moran's I indicates significant spatial patterns and Local ...
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13 views

Probability that difference between demand for two skills in a population sample is due to chance

I am trying to measure the demand for two skills in group of companies that are hiring software developers. One skill might be e.g. Java and the other e.g. C++. If out of 100 companies, 30 report they ...