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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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. nominal data). I have test results for pre test, week 1, week 2, week 3 and week 4. I ...
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3 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
12 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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14 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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14 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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12 views

Chi-square: naïve compensation for problems with 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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19 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
31 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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19 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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33 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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7 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
48 views

Which test to use to compare calculated percentages?

I have data in the following form: ...
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1answer
14 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
53 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 ...
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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
43 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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15 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
30 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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40 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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17 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 ...
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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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20 views

What would be null and alternate hypothesis

A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film and believes that this can be achieved by reducing the ...
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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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28 views

Mood's median test - an apparent paradox

I have collected some data about systolic blood pressure in kids. Altogether, I have collected 500 measurements of blood pressure - 300 measurements for girls and 200 measurements for boys. The ...
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35 views

Is it appropriate to conclude the relationship “does not matter” because the regression coefficient is not significant?

Many papers (e.g. apps.washingtonpost.com/g/documents/national/does-the-amount-of-time-mothers-spend-with-children-or-adolescents-matter/1490/) try to claim an insignificant regression coefficient ...
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+50

Poisson Hypothesis Testing for Two Parameters

So, for fun, I am taking some of the data of calls from the call center I work at and trying to do some hypothesis testing on them, specifically the number of calls received in a week, and using a ...
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16 views

Analyzing ordinal and nominal data [closed]

The data collected from my survey is ordinal and nominal data . How can i analyze it to test my hypothesis ? Calculating a mean and a standard deviation for categorical data is not possible then what ...
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38 views

Why to use randomized tests [duplicate]

I've learned that there are two types of tests: nonrandomized, where the test takes only two values $\psi:\mathcal{X}^n\to\{0,1\}$, and randomized where the test is $\psi:\mathcal{X}^n\to [0,1]$. In ...
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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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1answer
33 views

3 categorical IV and 1 categorical DV — what test to use?

Here's my setup: Independent Variables (IV): (A) Task -- values 0 - 6 (order doesn't matter) (B) Viewpoint -- values 0 - 26 (order doesn't matter) (C) Input-device -- values {touchscreen, mouse, ...
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2answers
28 views

Is it acceptable to use a paired t-test to compare my drug dosage data?

I have a table of patient demographics like height, weight, and some lab values, as well as data on the doses of a drug that the patients received. Using the patient demographic data, I also used a ...
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2answers
29 views

Forecast encompassing test for cointegrated time series

I am forecasting an integrated time series variable $y_t$. I have two competing forecasts, $f^1_t:=f^1_{t|t-h}$ and $f^2_t:=f^2_{t|t-h}$. I would like to test whether $f^1_t$ forecast-encompasses ...
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44 views

Power of the hypothesis test

To test the effectiveness of a diet, a random sample of 16 female patients is drawn from a population of adult females using the diet. The weight of each individual in the sample is taken at the start ...
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3answers
47 views

A basic question on hypothesis testing

In hypothesis testing a hypothesis is generally defined to be "a statement about the value of a population parameter". For example the mean value of the height of people living in a certain city. I ...
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1answer
24 views

Interpretation of empirical frequency of null hypothesis rejections

assume I know a theoretical distribution that is quite non-normal. I simulate many (N) samples of given size (T). Then for each sample I test if the sample average is equal to the theoretical one ...
2
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1answer
29 views

Does an underpowered mediation/moderation SEM have an increased chance of Type I error?

A study I'm familiar with has been encouraged by its review board to take more participants. This seems a sensible request on general grounds, but the reviewers suggested that it was essential to ...
2
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1answer
18 views

Power of a composite test

I know that power function is defined as $\beta(\theta)=P(\mathbf{X}\in R\mid\theta)$, where $R$ is the rejection region. For a composite test, $\Theta_0^c$ is a set. How do we define "the power of a ...
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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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31 views

A/B Testing - Can you trust the math with small samples?

Let's say I test a new version of my signup page. After the original and the variant each get 100 views, here are my results: Original had 1 conversion (1%), and a 95% confidence interval of 0-2.95% ...
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1answer
16 views

Techniques to deal with unobserved values in test [duplicate]

In my data, I have some items that a customers purchase. I need to predict the customers behavior with different items. But in the test set, there are some items that are not present in the training ...
4
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1answer
101 views

Neyman-Pearson lemma

I have read the Neyman-Pearson lemma from the book Introduction to the Theory of Statistics . But I have not understood the lemma . Can anyone please explain me the lemma in plain words ? What ...
2
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0answers
16 views

Test that does not based on sufficient statistics [closed]

In the context of adaptive clinical trials, inverse normal method/test was addressed as not based on sufficient statistics, while sequential tests do. Is it because in adaptive design, the test is not ...
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1answer
18 views

Testing differences of multiple means and variances

Does ANOVA tests the pairwise difference of multiple means at once, or is there any method to test the pairwise difference of multiple means or variances at once?
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1answer
30 views

How to interpret ANOVA result?

I'm doing a research on factors affecting organizational culture in a company and in order to test my null and alternate hypothesis I was asked to use ANOVA on SPSS. This is the result I got for doing ...
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1answer
8 views

Question about consumer report and market shares

in my job we just got a consumer report about the automotive industry in which they outline the most significant brand attributes considered in the process of purchasing a new car. I transformed the ...
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20 views

Two-sample t-test (Welchs test) which distribution to sample from

I have the following problem: I have two weird distribution and I want to figure out which has the higher mean. To do that I can sample from either distribution and use a Welch's test to figure out ...
4
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3answers
92 views

Why does hypothesis testing using coefficient and odds ratio give different conclusion?

After fitting a logit glmer model in R, I got the following coefficient estimate: ...