Hypothesis testing assesses whether data support a given hypothesis rather than being an effect of random fluctuations or some other process described by an alternative hypothesis.

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How to estimate relative risk for a small group which has 0 members with the outcome?

I have a contingency table that looks like this: ...
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How to asses significant differences in between participant pretest posttest design?

So, the groups would be control group and experiment group. The scale used is ratio. Both will be given pretest and posttest. So, how should I assess the differences between control group and ...
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2answers
18 views

How to show that the condition of one hand predicts the condition of the other hand

I have this kind of data: subject hand condition s01 left 1 s01 right 0 s02 left 2 s02 right 2 .. .. .. ...
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1answer
11 views

Help - what is the correct test? [on hold]

im a novice at this and really need some help. I am trying to compare a before and after set of data on 4 different subjects scores. For example: Car scores (3 different scores) pre-work: Car 1: 36, ...
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7 views

Two-way ANOVA, not quite right

All my data in independent and a random sample from a population. I have collected data and have one dependent variable and 2 different independent variables: Dependent = Length Independent = ...
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1answer
71 views

One-sided significance test for correlation

Let's say you have data from two random variables $X$ and $Y$, and the two random variables are highly correlated (ex: $r=.97$). The p-value, which is testing the null hypothesis that there is no ...
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1answer
18 views

What is a paired observation or paired variable?

The question kind of asks itself, can anyone explain what a paired observation or paired variable is in basic terms? My data consist of the number of words learnt in a week for 19 different ...
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37 views

How I can interpret mean, and standard deviation

have a sample of 30 data for daily energy consuming of a person. I found the "Mean" and "Std.Dev." of my samples as follow' Mean = 150 Std. Dev.= 30 I want to prove that he/she has a stable energy ...
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19 views

Testing significant difference of correlation matrices

I'm interested in exploring whether responses to a series of attitudinal questions differ across various countries. I could check significant difference in mean scores but am more interested in the ...
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1answer
21 views

Does rejection of null hypothesis ($p < \alpha$) for one representative sample imply rejection in a different sample?

I am new to hypothesis testing so forgive me if this has already been asked. Suppose that I've already decided on a null hypothesis with a significance level $\alpha = 0.05$, then obtained my ...
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3answers
60 views

Testing for autocorrelation: Ljung-Box versus Breusch-Godfrey

I am used to seeing Ljung-Box test used quite frequently for testing autocorrelation in raw data or in model residuals. I had nearly forgotten that there is another test for autocorrelation, namely, ...
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7 views

Which hypothesis test to use to test significance of trend line on time series whose points are computed as average measures?

I would like to test the significance of a trendline visible in my data set, which consist in 17 successive points (i.e. my data set is a time series of length 17, considering 17 years). However, each ...
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12 views

What exactly is a proportionality test?

I have heard and read informally about proportionality tests in the context of NHST, but I still don't understand what they are and what they measure. I couldn't find examples or a definition on ...
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0answers
19 views

Eliminating a nuisance parameter in likelihood ratio test

I am having an argument with a co-author about how to eliminate a nuisance parameter in a simple likelihood ratio test and am hoping that the community helps us settle it. Our data $\mathbf{x}$ can ...
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0answers
27 views

Comparing two algorithms by time series analysis

I have two algorithms. There is one vector of accuracy measurements for each algorithm. Each accuracy result in a vector corresponds to a moving average over a sliding time window and the vectors are ...
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0answers
29 views

find variables that have significant difference between two groups?

I have two grouped data sets with too many variables. As a pretest, I would like to find variables which show significantly difference between the groups. What kind of simple test I can do?
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2answers
31 views

Hypothesis testing on multiple regression coefficients

In the simple linear regression setting, in order to determine whether there is a relationship between the response and the predictor we can simply check whether $\beta_1=0$. In multiple regression, ...
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18 views

Likelihood of hypothesis in live data

Bayes rule is $P(H|E)=\frac{P(H)P(E|H)}{P(E)}$ I have a prior distribution from categorical data prior={'a':0.2,'b':0.6,'c':0.1,'d':0.1} Which forms my ...
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35 views

How to perform a user defined hypothesis testing on regression coefficient uisng R? [closed]

i Performed a multiple regression uisng R the regression equation is , USRevenue = (beta0 )+ (beta1)Budget + (beta2)Opening + (beta3)Theaters after that i want to test the folowing hypothesis .. ...
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6 views

Sequential Probability Ratio Test (or other Sequential Sampling techniques) for proving difference

I have the results from running two algorithms and I want to be able to say that there is, say, a 95% probability that one of the sets of results is different to the other where different means A > B ...
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1answer
36 views

Main effects significant but no significant interaction

My hypothesis for my dissertation was to find an interaction between two predictors; however, my results showed that the interaction was not significant but the main effects were significant.  In my ...
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0answers
9 views

What is the correct way to do a likelihood test among 10 multivariate normal distributions?

I am currently working on some data and I know they are from one of 10 multivariate normal distributions. What is the correct way I can distinguish where the data comes from? I would like to do ...
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47 views

Which test for hypothesis testing?

I have conducted an experiment with a treatment and a control group. I have fidelity data from the treatment group and I would like to see if the higher level of fidelity of the intervention affected ...
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2answers
27 views

Hypothesis testing statstics

The management of a fast-food restaurant claims only 50% of its customers read the nutritional labels attached to the containers of its products. A random sample of 92 people were surveyed and asked ...
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1answer
44 views

How to test a hypothesis about the mean based on an assumed normal distribution?

The entrance onto a major bridge in New York City was engineered to accommodate an average of $3800$ vehicles per hour. However, a random sample of nine observations gives an average of ...
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16 views

Intercept, deterministic and stochastic cointegration

I have reading on the Johansen co integration model. I am using the jci test function of MATLAB. I have some a little trouble selecting the 'model.' can somebody explain in layman terms which and what ...
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12 views

Which test should I use to determine whether multiple binomial experiments results are different, with p not equal to 0.5 for all? [duplicate]

I have four subject A,B,C,D, I asked 500 students whether they like each subject, there are two choices: Yes/No. I want to test, do students have a preference for any of A/B/C/D? Originally I used ...
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25 views

What test should i perform in SPSS

I have data from two groups (placebo and supplement A) which I tested regarding happiness ranked from 1-10 (i.e. ordinal data). I have test results for pre test, week 1, week 2, week 3 and week 4. I ...
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12 views

Multiple Linear Regression, Permutation and FDR

Suppose I performed standard permutation testing with multiple linear regression. That is, I performed linear regression multiple times after permuting the response variable. I now have the ...
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1answer
16 views

Hypothesis Test on Contest, a problems?

We have a contest 1 weeks ago. One question is a bit strange for us as follows: $X\sim B(4,p). $ for test $H_0:p=0.2$ versus $H_1:p>0.2$. if $X=4$, $H_0$ assumption is rejected. calculate ...
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17 views

Binomial data: Null Hypothesis $p = 0$ when all Sample Values are 0 - testing and power analysis

I am trying to investigate if the proportion of successes in my population can be shown to be larger than zero. Thus, $H_0: p = 0$ and $H_A: p>0$. Since $p=0$, the prop.test in R does not work, ...
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23 views

dependent samples, binary data, multiple tests?

In each of my five experiments I run several trials which give me a certain success rate (e.g. 10 successful trials out of 30 tested), then a drug is applied and the same trials are run to give a ...
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2answers
55 views

Chi-square: naïve compensation for low frequencies

As far as I understood it, chi-square provides a measure for determining the similarity of the expected and observed (empirical and theoretical) distributions of nominal variables. It can be employed, ...
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7 views

Covariates and interactions

I have collected data and am trying to interpret my results. I am analysing data on plant traits between treatments, hot and cold. The plants I grew myself and are all from the same population. I ...
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23 views

Test for differences in distributions; three samples; multimodal distributions

Here is a question on how to test for differences in distribution between three samples of multimodal distributed data. I have conducted a dictator game (http://en.wikipedia.org/wiki/Dictator_game) ...
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1answer
33 views

Which statistical test to use?

I have acquired data with multiple variables that I need to test. My dependent variable, Seed number, is tested between Ecotypes but also between Treatments (hot and cold). I need to see whether Seed ...
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1answer
25 views

Comparing rates of success in paired groups of samples

I have $2n$ paired populations, on which I measure a rate of success, let's say $(r_{group}^i)_{group \in (0,1)}^{i \in[1,n]}$ where $r_0^i$ and $r_1^i$ are the rates of success in the $i$-th pair of ...
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39 views

Compare sample means of normal distribution with autocorrelation issues

Please forgive me if this is a naive question, but I haven't been able to find an answer in my stats books or online. I'm working on a fish tracking dataset that consists of detections of tagged fish ...
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8 views

Test for multinomial distribution with multiple number of data

Suppose that we are modelling certain lists of data by multinomial distribution. For example, the data consists of four measurements (showing the number of appearance of each of 5 states) look like ...
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28 views

Which test for count data?

I would like to know which test is better to use to test if two sets of counts are significantly different. kindly
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3answers
49 views

Which test to use to compare calculated percentages?

I have data in the following form: ...
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1answer
15 views

Obtaining test statistic for problem with two populations

Given a sample population of 54 men and 61 women, I want to figure out whether or not the average male spends less time during his daily shower than the average female spends during hers. The average ...
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3answers
58 views

At what point do significantly different groups start to differ?

I have two groups: a control group (N = 91), and a treatment group (N = 54). I did a t-test in SPSS that suggests that there are significant differences between the two groups in terms of the variable ...
2
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0answers
12 views

Hypothesis testing: 95% confidence intervals of group means overlapping zero or 83% confidence intervals?

I am trying to select between the following two methods to look for significant differences between two abundance estimates: 1) calculation of the 95% confidence interval for the difference between ...
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1answer
45 views

What test should be applied in SPSS?

I have categorical data of drug relapse among the rehabilitated clients of drugs user. Some cell values are less than 5 ie. zero. chi square test can not be applied here. what test must be applied ...
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1answer
52 views

Help with HW questions

I have two following questions I could not really decipher how to get the P-Value. Data from a recent year showed that 71% of the tens of thousands of applicants to a certain program were accepted. ...
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16 views

p-test for parameter

Statisticians, number magicians, I was wondering what the best way is to check for the equality of two parameters including possibly a confidence interval and p-value. $$H_0:\beta_1=\beta_2\vert\ ...
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1answer
31 views

Would a t-test apply? Statistical Test Suggestion

Given two lists of characters. For example List #1 A C O P List #2 A O R T How would you test whether the two lists differ significantly or not. I feel like a t-test can be applied, but I'm not ...
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46 views

Interpreting Granger Causality F-test

This question is a bit basic (I reviewed the previous postings on similar subjects, but still need help with this). Thanks in advance for any answer. The question is if A & B are two time-series ...
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21 views

wald test and score test, normal or chi square?

I learnt from section 10.3 of statistical inference that both Wald test statistic $\frac{W_n-\theta_0}{S_n}\approx\frac{W_n-\theta_0}{\sqrt{\hat I_n(W_n)}}$ and score test statistic ...