Linked Questions

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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 ...
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50 views

Modify test statistic in one point to obtain low p-value

Consider an NHST, for example a one sample t-test for $H_0:\mu\leq0$. The test statistic is $T(x) = \frac{\bar{x} \sqrt{n}}{s(x)}$, which has $t(n-1)$ distribution. Now I make an observation $x^*$, ...
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382 views

How to choose a suitable $p$-value?

I encountered this problem: Suppose $Y$ has the following PDF $$f(y)=\frac c{(1+y)^2}\cdot I(0\le y\le \theta),\quad\theta>0.$$ A single value $y$ is observed from the distribution. ...
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39 views

what type of hypotheses does “goodness of fit” signifies , i.e is it single tailed or two tailed? [duplicate]

Suppose it is required to test the fitting of binomial distribution to the following data ( at level $\alpha =0.05$) : the parameter p is estimated as p = 0.494 , and the expected frequencies (given ...
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55 views

Conditionality in p-value definition

Can we interpret p-value: $$P(T(x)>t\mid H_0:\mu=\mu_0)$$ in terms of usual conditional probability, which some random variable (T - test statistics) is conditioned on an event that some population ...
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479 views

Correlation coefficient different from zero as Null hypothesis

According to Wikipedia: In inferential statistics, the term "null hypothesis" usually refers to a general statement or default position that there is no relationship between two measured ...
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410 views

Intuition behind the p value for pearson correlation calculation

I understand that p-value is the probability that the correlation we got happened by random chance and we typically want to keep that under 5%. I am okay with this logic when it applies to sampling of ...
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124 views

Logistic regression: Ranking of Betas (Categorical variable)

I am running a logistic regression in Stata and would like to rank a categorical predictor variable (which is translated into four binary variables). Stata gives out three of them and compares them ...
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60 views

On interpreting the statistical significance of R squared

I have performed a linear regression analysis to two series of data, each of which has 50 values. I did the analysis in SPSS and as a result got a table which says ...
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17 views

How to interpret the student t statistic in a sas proc univariate output [duplicate]

I ran a proc univariate on a SAS data set and one of the output results was: ...
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13 views

Interpreting results of Libreoffice Calc's TTEST function [duplicate]

I'm doing some data analysis on a small dataset (35 individuals) and I'm wondering whether my findings are statistically significant. Individuals are asked questions before and after a treatment, so ...
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694 views

Understanding ANOVA for comparison of models in R. Why is the result the same regardless of model order?

I'm trying to figure out why the anova function in R gives me the same results (for the p-value) regardless of the order of the models. ...
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21 views

what does value of t test mean? [duplicate]

I have two distribution of one variable and I've used t test to find how much they are significantly different. But I'm not very familiar with this test and don't know what does this values mean? is ...
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19 views

Test if two means are significantly different in R [duplicate]

I would like to test if two means are significantly different from each other. I am using R and I do this: t.test(SampleA,SampleB) and I get output that looks ...
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23 views

Mann-Whitney U and KS tests in R are not producing significant results [duplicate]

I wish to compare two test data sets using the Mann-Whitney U and KS tests in R. As a start, I thought to compare two similar sets (an A/A test) expecting to see a highly significant indication of ...

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