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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Multiple Library Customer Service Survey

My office has purchased a customer satisfaction survey for 106 public libraries. There are 189355 active library members in the province but only 677 individual chose to complete the survey. Would ...
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2answers
18 views

Statistical test to compare paired scores

I would like to measure (to quantify with a statistical test) how much different are paired scores. For example: for gene "x" I performed an experiment with technology A that gives a score, then for ...
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10 views

Assessing stability of a method to less data (subsets of it)

I'm working on a (computational biology) method which provides a result given a set of data regarding a cell. For example, it takes a picture of an object (or a part of it) and assesses the object's ...
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9 views

Studentized range statistic (q*) in Python Scipy [on hold]

I do not mean to spam, but i do not know if different stackexchange communities interface with each other, but i am wondering about the following question ...
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6 views

Interpreting moderation in a hierarchichal regression

I am researching whether gender moderates the relationship between exposure to trauma and PTSD. The results are confusing me. I found that gender does predict PTSD above and beyond exposure. However, ...
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1answer
32 views

Cox model on bank customers

I am setting up a Cox model, to model the probability that new customers leave the bank . I had a nice set up, with plenty of significant explanatory variables, until the result of one categorical ...
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1answer
23 views

What is the best method to analyze this standard example data

The MASS package in R has 'anorexia' data set that compares the results of 3 treatments on weights of patients. Which statistical method is ideal to analyze this data set? There is one control (Cont) ...
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1answer
60 views

Logistic regression: my main effects lose significance when I add my interaction effects. Why?

I have a dichotomous dependent variable for a 2x3 experiment. There are about 30 observations in each cell, for a total sample size of about 180. Each person was only in one cell. The dependent ...
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28 views

Test fixed effects for joint significance in R

Just as in this post I'm looking to test for the joint significance of the fixed effects in a model. Unlike the post I referred to, I'm looking to test each fixed effect individually. I have used a ...
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7 views

F statistics is given as dots after using clustered standard errors option

My question is the following: I am using Demographic and Health Survey of Turkey to estimate the equation below. Standard errors are clustered for 26 regions, in which individuals lived when they ...
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1answer
52 views

Masked variables in logistic regression

I have a logistic regression model with variables $V_1$ through $V_n$. When I build a full model with all of the variables, I find that $V_1$ and $V_2$ are significant. However, when I build a new ...
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8 views

experimental design - variables and tests

I would like to design an experiment and see if there is any useful information to be gained by tracking several variables. The problem is that I am unsure of how to specify the variables (their type) ...
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1answer
44 views

Statistical test for the difference in center positions of two receptive fields

I am a neuroscientist, and have neuronal response measurements for a large range of stimuli delivered to my subjects. I use this data to construct receptive fields (RFs), which show the mean response ...
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16 views

mean of clients during a specified time interval

I would like to calculate the mean number of guests in a restaurant for example, during one week. I have two cases: 1- we take measures of number of guests each 5 minutes, 2- we take measures each ...
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6 views

How to find out is the difference between two social network based on their assortativity significant?

I've got two networks and I want to prove somehow that one of them is more homophilic not by chance.
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25 views

Do you have any information about regression model and logistic regression notes [closed]

Please share the link or any source for statistics notes to refer for in-depth study.PDF is also welcome.I want specially Regression Model,Machine Learning & Logistic Regression notes.
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16 views

Difficulty choosing the right type of analysis

I have to write a proposed methodology for a study investigating the cognitive effects of beetroot. I will be using 2 separate groups of participants. I will first take their resting blood pressure ...
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14 views

psychic testing control group

You have seen it on television, two men sit across a table from each other, a deck of cards between them. The man in a lab coat draws a card and looks at the card. The other man places his hand to his ...
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11 views

How do I compare a new method of statistical sampling with an established one?

Lets say that: There exist 10 countries. I travel to each country and take a random subset of the population of that country and count how many of my subset are woman. I make a table of country to ...
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27 views

Insignificant squared term but significant linear term

I am estimating the following model: $\ln(y) = \alpha + \beta_1x + \beta_2x^2 $ $\hat\beta_2$ is insignificant while $\hat\beta_1$ is significantly different from zero. However they are jointly ...
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62 views

How do I analyse in R? [closed]

Edit: Re-write of my previous question due to my shoddy presentation. I am a complete R beginner and so have little to no knowledge as to how to go about performing statistical tests in R. Sample of ...
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19 views

Do Dvoretzky–Kiefer–Wolfowitz bounds and Kolmogorov-Smirnov test different hypotheses?

This question is related to my previous question that was answered excellently by Matt Krause. I am trying to compare two data vectors to find out if they come from the same distribution. I computed ...
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12 views

small sample size [closed]

I am doing a study in which I have 21 variables which need to be intercorrelated and I need to look for statistical significance. The data are nominal. I only have a small sample size of 21 ...
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22 views

How to compare Pearson correlation coefficients from spatial data [duplicate]

Dear "Cross Validated" community, First I want to introduce my data to you, so that you can get a clear overview regarding the problem I´m confronted with. For some urban studies I´ve got a spatial ...
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7 views

Computing statistical significance for correlations between PCA scores

What would be the best way to statistically compare difference between component scores in PCA between different days? I used PCA for 10 days of my experiment. Since I have 5 principal components for ...
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1answer
28 views

Weak dependence of a variable

I asked the same question last week, but it seems it wasn't that clear and it was closed, so I try to expand it to explain better what I need. If I cannot do this, sorry in advance. I have a variable ...
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3answers
40 views

test for increasing correlation over time

I have some data that tracks 2 variables over time. Let's call them A and B. So I have data on A and B for 15 years. I know how to calculate the correlation coefficient, but my goal is to see if the ...
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8 views

Permutation test for 3 variates

I have 3 covariates, which are merely count data. They have 3 different means. How can I get a unique p-value or how can I compare them? The aim of my study is to know if those populations are ...
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2answers
36 views

Applying inferential statistics for census data

Let's assume I have a census data of a population which I would like to study and it has variables such as age, gender, sex, occupation etc and the dependent variable which is community participation ...
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1answer
51 views

Computing Dvoretzky–Kiefer–Wolfowitz bounds in MATLAB

When I run the Kolmogorov-Smirnov test (kstest2 function in MATLAB) on two given data vectors, I get the value of KS Statistic. How should I compute Dvoretzky–Kiefer–Wolfowitz (DKW) bound using this ...
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1answer
15 views

Hosmer-Lemeshow test with weighted data

I am trying to perform Hosmer-Lemeshow test on weighted data (i.e. each observation in a data set has its weight). Unfortunately, I cannot find any literature on how to perform such test. Do you know ...
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55 views

Opposite of $p$-value for null hypothesis?

Disclaimer: I have no statistical background. So please excuse, and correct me please, if I make several amateur mistakes below. I have two groups (let's call them $A$ and $B$) and a particular ...
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1answer
45 views

Econometrics advice needed on unpaired t-test

There are responses of my school's alumni on the skills they perceive they acquired during the studies and are required from their job now. 18 skills evaluated from 1 to 5 (ordinal values, right?). ...
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29 views

Statistical Significance , which approach?

[editing original post to clarify my question] I have looked at some of the other posts on this but still can't grasp if these 2 are different approaches to determining somethings stat sig, or if ...
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What statistics test can I use to make results more persuasive rather than just reporting M and SD?

I was recently given the task of reading and article and sort of critiquing it with the help of questions. I am from a psychology background but this journal is to do with communication and ...
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Does overlapping standard deviation between null and candidate models imply statistical insignificance? [closed]

Let me give an example. Suppose I'm trying to solve a classification problem. I am using 10-fold cross validation to evaluate performance and I am testing two classifiers ($C_1/C_2$). Let's say that ...
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Probability, Predict Percentage of Team A vs Team B

Let's say we have Team A and Team B. Team A wins 60% of the time while team B wins 70% of the time. Team A wins 40% of the time at home and Team B wins 30% of the time at home. Team A has never ...
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How to determine how many simulations to run, in order to illustrate “extreme-valued statistics”?

As an engineer trying to learn statistics, I wonder if someone could please recommend references / a statistical method that may assist with determining the number of simulations that need to be ...
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1answer
23 views

Regression Slope and a Bilateral Test

Well, I observe that the standard statistical software package tests regression coefficients if they are statiscally different from zero, that is, not specifically higher nor lower than zero -- a ...
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10 views

what statistical test should I use to compare differences between weight perception and BMI categories?

My question is: I am trying to see if there is a difference between weight perception ( categorical- underweight/overweight/about the right weight) and actual BMI (categorical- ...
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23 views

Evaluating close calls with the Wilcon Sum Rank test two sided vs. one sided

I am testing to see if the means of two groups G and R are different. I cannot use a t-test because the data is not normal so I am using the wilcox sum rank test which seems like the non-parametric ...
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Wilcoxon Rank Sum test null hypothesis

I am doing a Wilcoxon Rank Sum test in R to see if the means of two groups of data (the data is not normal) are statistically different. When I look at the details of the wilcox test ...
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25 views

What does a p-value actually mean in a two-sample t-test? [duplicate]

Suppose I have two sets of samples, and I calculate a two-sample t-test, which gives me a two-tailed p-value of 0.0138. Is this the same as saying "The probability that the two sets are not ...
3
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2answers
75 views

Test two groups with only sample statistics or without distributional assumptions

I have two sets of samples, A and B. I want to find whether the underlying mean (i.e. if the sample size was infinite) of A is greater than that of B, to a certain confidence (95%). There are two ...
3
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2answers
32 views

How to test if 2 means are significantly different for non-normal non-paired data

I have 4 averages from 4 samples and I want to test if the means are significantly different. When I look at the QQ plots and the shapiro wilk test (all have very low p values) the data is not normal ...
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2answers
52 views

Statistical Significant vs Correlation

In my regression one of the control variables has high statistical significance. But when I check the correlation coefficient between this variable and the dependent variable the correlation is almost ...
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26 views

Multicollinearity and two variable with the same level of significance

I have a high value of correlation between 2 of my explanatory variables (0.79), and they are both significant at the same level exactly. Besides that they are both important to the model. The ...
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1answer
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Determine if one-point samples are significantly different from a set-of-values sample

Well, I have a sample x made up of 28 cases, sample y -> one case, sample z -> one case. I would like to determine if y and/or z are significantly different from x. It's not possible to take more ...
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1answer
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Significance of a cluster with respect to the whole dataset

I mainly am a machine learning guy and my knowledge of statistics is a bit limited. I have a (small) dataset of objects described by two categorical variables: $$ \begin{array}{|l|l|l|l|l|} \hline ...
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What statistics should I use for my comparison?

I am currently analyzing leaf senescence over two sites, using 6 species, each with 5 replicates. The senescence is measured in percentages. How could I analyse the two, to see if there were any ...