8k views

Explaining p-value to a sophisticated layman [duplicate]

I think I understand the concept of p-value but unfortunately I still have to exert a lot of brain cycles to get my arms around it. I would like to get an explanation of the p-value that is rigorous ...
32k views

Interpretation of the p-value of the y-intercept coefficient in a linear regression [duplicate]

I am trying to interpret one of the p-values in a one variable linear regression. Some of the answers I've seen for similar questions were not worded as thoroughly as I would have liked. My ...
9k views

White noise test interpretation [duplicate]

How to interpret white noise test from Stata? Have a white noise means that a variable does not have autocorrelation. Can I say here that all of my variables has a white noise (does not have ...
11k views

what does it mean for a variable to be statistically significant? [duplicate]

what does it mean for a variable to be statistically significant?? Could anyone give a complete answer to this question?
7k views

What does the p value mean for Cox hazard ratio? [duplicate]

I am puzzled about the interpretation of P value in the Cox hazard ratio analysis. I read from literature that the P value is to "reject the null hypothesis that HR=1". However, in many cases, we have ...
7k views

Why is smaller the p-value, larger is the significance? [duplicate]

I am trying to understand the concept of p-value. Wikipedia mentions: The p-value is defined as the probability, under the assumption of hypothesis $H$, of obtaining a result equal to or more ...
2k views

How to read the alternative Hypothesis [duplicate]

I have created a T test in R and got the below output. ...
1k views

Intuitive explanation of why p is not the probability of the null hypothesis [duplicate]

I've got to teach a basic course on the $\chi^2$ test soon, and I will of course insist on the fact that $p$ is not the probability of the null hypothesis to be true, and that the result of the test ...
3k views

Is there an accepted definition for “P for trend” or “P-trend” [duplicate]

So is "P for trend" the same in principle as a common-or-garden P-value, but in a specific application i.e. odds ratios? And can P-value, P for trend, and P-trend be regarded as interchangeable ...
2k views

Breusch-Pagan Test using R [duplicate]

I'm currently working on the Breusch-Pagan Test using RStudio through the command ncvTest. I've used the dataset pipeline.txt in ...
3k views

T test and P value [duplicate]

Possible Duplicate: What is the meaning of p values and t values in statistical tests? I currently start epidemiology class, I am very confuse of p value and t test, what do they mean? how to use ...
2k views

Reset test in r [duplicate]

I have two questions about this test in R: How do you read the result of p-value? I assume that the bigger it is the more successful it is. When I do a multiple dummy variable regression, I get a p-...
464 views

P-Value Clarification [duplicate]

I'm new to P-Values and Hypothesis testing and I noticed that p-values are explained differently everywhere I go. In my lecture notes it has a method for hypothesis testing and the last part says that ...
918 views

How to read R program P-Value for Logistic Regression [duplicate]

I'm not used to that kind of p-value form as I don't know how to interpret it... It's usually shown a p-value with stars (significant codes) on its sides Can anyone help? How to read if the variable ...
258 views

Why reject, not accept $H_0$ when $p$ value less than $\alpha$? [duplicate]

Let's say ABC drug company claims their medicine cures 90% of patients. Now a doctor conducts a trial by taking a random sample of 15 patients. Result shows 11 of them are cured but 4 are not. In ...
605 views

What does “more extreme” mean when talking about p-values? [duplicate]

As far as I understand it, the p-value is the probability of obtaining the observed data or more "extreme" values under the null hypotesis, concluding that if this probability is small enough the null ...
288 views

Generating i.i.d samples in MATLAB: large p-values [duplicate]

I'm trying to generate i.i.d samples from two uniformly distributed random variables in MATLAB. However, when I correlate the two sets of samples, I find that the correlation is almost zero, but the p-...
251 views

Are p values obtained from t-tests? [duplicate]

Question: Are p-values determined from t-tests? What is the relationship between a p-value and a t-value? It states in this article here, the instructions to finding a t-value: How to Calculate T: ...
267 views

Why reject Null Hypothesis when p value< alpha? [duplicate]

As per statistical literature, there seems to be this understanding that given a p value less than alpha, we are to reject the null hypothesis. The way I am interpreting this is that is the critical ...
227 views

What does P>0.05; 0.025 < P ≤ 0.05 ; Yes, 0.01 < P ≤ 0.025 and, P ≤ 0.01 mean ? hypothesis testing p-values [duplicate]

I'm learning for my exam which is tomorrow and in the practice exam there are a lot of questions where you can choose between those p-values, but what do they mean? an example question A test is ...
195 views

Anderson-Darling critical value in R [duplicate]

I am using R and i need to do an Anderson-Darling test on my data. I am using the adk package ( http://cran.r-project.org/web/packages/adk/adk.pdf ). How do I calculate the critical value for a given ...
67 views

Should you reject $H_0$ at the 0.10 level? [duplicate]

If the p-value is greater than 0.900, should you reject $H_0$ at the 0.10 level?"
164 views

How to understand what a high p value indicates [duplicate]

I am reading a research article and trying to interpret and report the results. The article is comparing gabapentin and estrogen for the treatment of hot flashes. There was no difference between ...
49 views

p value in a testing [duplicate]

Why does a test return the p value? I am looking at the Diebold-Mariano-Test (DM Test): https://github.com/johntwk/Diebold-Mariano-Test Basically, this test gives me a DM statistics, and also the p ...
100 views

Interpreting what this means in a paper - significantly different at the .05 level? [duplicate]

I am having a hard time interpreting what something means in a paper I'm trying to get through. If you care, this is the paper: Gender Differences in the Effect of Education on the Slope of Experience-...
102 views

What does p-value mean in Multiple Regression Analysis? [duplicate]

I was trying to learn the usage of p-value in Multiple Regression Analysis. I have found the following sentence which meaning is not clear to me. If the null hypothesis is true (b1=0), the chance of ...
94 views

Poisson distribution help [duplicate]

In many cities, neighborhood Crime Watch groups are formed in an attempt to reduce the amount of criminal activity. Suppose one neighborhood that has experienced an average of 10 crimes per year ...
65 views

What does my p-value indicate? [duplicate]

so I got similar results from a t-test output for my p-value 2.50e, but am not sure if it's correct or how to interpret. ...