Questions tagged [hypothesis-testing]
Hypothesis testing assesses whether data are inconsistent with a given hypothesis (usually a null hypothesis of no effect).
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Why should I care about transforming the data for t test when I can use nonparametric Mann-Whitney-Wilcoxon test?
I ran into this question at my lab when I was trying to transform my data using things like log transformation, square root etc. when my lab members just directly asked me to apply mann whitney test ...
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Test to compare 4 proportions in R
I would need help in order to perform a proportion comparison between 4 different modalities of one factor.
Here is an example.
I would like to compare the proportion of mother-to-child smoking ...
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Stats Test with Continuous X and discrete Y
I am comparing income (continuous) with return to work status (discrete variable with three possible values: 1,2,3). What stats test would I use to perform this? I was thinking of breaking income into ...
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test of proportions, but only want to test the proportion between 2 samples
I have a questionnaire with X possible answers (only 1 answer is allowed) an a sample size N.
I want to perform a test of whether answer 1 is more likely than answer 2 for example, regardless of the ...
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Confusion about Type I Error and Sample Size
A candy company claims that its lollipops have an average weight of 23 grams. A statistician is suspicious of this claim (believing the average weight to be lower than 23 grams) and decides to conduct ...
user186915
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Comparison Statitics
I have 100 respondents from whom I have collected trip data for 3 months. I dont have control group or base condition.
I want to measure if the proportion of aggressive trip (Trips with atleast one ...
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Alpha and Hypothesis Testing [closed]
(The type I error, alpha) Which one of the statements about the alpha level is correct?
a) The alpha level is the predefined probability of making a mistake when the null hypothesis is false.
b) The ...
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If you reject the null hypothesis at 0.025 level of significance, is it true to say that you may or may not reject it at a significance of 0.01?
If we just use the normal distribution, we can find that $ \alpha = 0.025 $ covers more area at the tails than $ \alpha = 0.01 $. So it's clear that you may or may not reject at $ \alpha = 0.01 $. But ...
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How to tell if the "clusters" I see in my pair plots are statistically significant or occurring by chance?
I have a data set with one row per subject. Some variables include laboratory parameters for blood chemistry, hematology, etc. I also have some flag variables: any = 1 if the subject experienced an ...
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How can I check if three or more results are statistically identical?
I conducted several experiments (for the moment 3, but there will be more in the near future), where in each experiment I made several measurements. I know (from previous experience) that the result ...
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Significance Levels(Region of rejection) vs P value comparison
Correct me if I am wrong,
The region of rejection is we picked up a significant level then use that to calculate rejection region while P value is the conditional probability of alternative hypothesis ...
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Non-Asymptotic Confidence Interval and Hypothesis Testing in R [closed]
I need to calculate the 95% non-asymptotic confidence interval for the estimate of slope $\beta_1$ as well as to test the following hypothesis:
$H_0 : \beta_1=0$ and $H_1 : \beta_1\neq0$ i.e. to ...
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Generalizing "Causal Impact" synthetic controls, to multiple outcomes
Does anybody know a way to generalize the use of the Causal Impact google R package to multiple outcome time series?
Say I ran a time series experiment and was able to set up multiple test outcome ...
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Am i doing the right test? does this hypothesis make sense?
My study is investigating the effect of 6 IV's on a categorical DV (yes/no- yes is coded as a higher score i.e 2) in 2 countries to see which of these IV's is a most important in predicting the DV in ...
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Testing Hypothesis
I have a sample of 40 data, that shows the average of time a person waits in a gas station line.
Descriptive statistics of this sample are as follow:
N= 40, mean= 115sec, std.dev.=11sec, min=90sec, ...
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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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R language-statistics-significance testing [duplicate]
Possible Duplicate:
R language and statistics hypergeometric test
This is in reference to my first question, although I have got an answer for it from Spacedman. But I am not entirely satisfied ...
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Is it valid to write a hypothesis using the result of THIS experiment to predict an original independent variable?
There is a dataset/study that has two independent binary variables, and a continuous dependent variable.
...
user179810
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Confidence interval does not contains 0, should we consider the p value? How?
Here is the summary of my linear model:
...
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How to calculate FDR and Power? [closed]
would anybody give details numerical example of FDR and power calculation? for example, there are p-values given, using these p-values calculate threshold using BH procedure. then calculate FDR and ...
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What test should I use with shannon diversity index values?
What sort of test should I use to get the p-value after getting a shannon diversity index? Also does anyone know if and how they can be done using PRIMER 5?
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Is the concept of "Regression toward the mean" closely related to Power Analysis?
Regression toward the mean says that if a measurement is extreme at first, it will gradually tend towards the average value in subsequent measurements.
Isn't this what Power analysis all about? Why ...
user46925
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What is the most efficient method to conduct for hypothesis testing?
To gather from the data whether the hypotheses I proposed are confirmed, I calculate the two means between different reform variables to see if the reform have influence on the performance indicators ...
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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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Determining if awards are fair
Imagine a population of people where $x\%$ have blue hats and $(100-x)\%$ have green hats where every year some people are awarded prizes. The rule is that everyone should have an equal chance of ...
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Are signal efficiency of selection and luminosity, nuisance parameters in a particle physics statistics treatment?
In statistics used in particle physics, one often says that whatever is not the parameter of interest, is a nuisance parameter.
For example, wikipedia :
https://en.wikipedia.org/wiki/...
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Categorical ordinal data: which test is better? [closed]
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
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Group A receives training, group B doesn't
which test is appropriate for this kind of data?...
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R - what is magnitude of region of similarity (epsilon) when using tost() from equivalence package
I have two vectors:
...
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Statistical test for proportions
I have a gene list with Up=208, Down=135 and No change=44. Total =387.
I have done a random shuffling 1000 times and obtained the mean Up=77.54, Down=74.268 and No change= 235.19
I want to test if the ...
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Find out p-value
The average order rate (Orders with revenue > 0) is 58% in the population. How likely is it that the observed sample order rate or greater is because of random chance? I am not able to upload data set ...
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Null hypothesis and $\chi^2$ test
Which null hypothesis can be tested by a $\chi^2$ test?
could you please write the description of the relevant null hypothesis or at least give an example.
Thank you.
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p-value and hypothesis testing [closed]
(The p value) Which one of the statements about the p value is correct?
a) The p value is the predefined probability of making a mistake when the null hypothesis is false.
b) The p value is the ...
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How do you calculate the test statistic of a hypothesis test with more than 1 parameter?
I am interested in testing the following hypothesis:
\begin{align}
\newcommand{\var}{\rm Var}
\newcommand{\cov}{\rm Cov}
\newcommand{\se}{\rm se}
H_0\!:\ B_2 + B_3 &= 1 \\
H_1\!:\ B_2 + B_3 &...
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Why isn't Random walk with trend non-stationary according to ADF?
A random walk with trend doesn't have unit root. So, null hypothesis will be rejected. Hence, according to alternative hypothesis, since it doesn't have unit root, it will become stationary process as ...
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Null Hypothesis [closed]
A survey found that 70% of college professors believe that their online education courses are as good as or superior to courses that use traditional face-to face instruction.
What is the null ...
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What test to use for p-value? [closed]
I have a 200 samples from a population, and I want the p-value to test for significance. What test should I use?
Is t-test ok? How do you determine what test to use?
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