Linked Questions

1 vote
2 answers
4k views

How do I interpret the results of this SPSS paired samples t test?

Paired samples statistics (table 1): pretest score mean= 41.6667, post test score mean= 93.3333, N=3 Paired samples correlations (table 2) Correlations= -.277 , Sig.=.821 Paired samples Test (Table ...
alicia ho's user avatar
2 votes
1 answer
1k views

Accept null hypothesis with uncertainty

I have data on weight of a group of people after and before a diet. I want to see if weight loss is distributed normally. ...
Cyberguille's user avatar
5 votes
1 answer
428 views

Why one result is so wide in this logistic multiple regession

I am doing multiple logistic regression with data with 24 predictor variables and 193 rows. All predictor variables have values of 0 or 1 and outcome variables (OUTVAR) also has only 2 possibilities. ...
rnso's user avatar
  • 9,957
2 votes
2 answers
636 views

If one group has 23 participants and the second group has 117 participants in it, can we rely on the result of t-test? [duplicate]

I was evaluating a research paper in which the authors have 23 male participants and 117 female participants. They have applied t-test to calculate Gender differences and have even concluded on ...
Amena's user avatar
  • 21
5 votes
1 answer
769 views

Comparing classification results from models selected differently with Kruskal-Wallis

For a seminar at university I'm reviewing a paper that proposes a new feature selection algorithm. The authors also evaluated their algorithm by applying it beside two other feature selection ...
deemel's user avatar
  • 2,704
4 votes
2 answers
891 views

Intuition with chi squared test and large frequencies

I'm working with categorical data and want to run a chi squared test. I want to test the frequencies: A = list(12455, 11554, 11908, 13416, 12647, 7828, 10172) ...
Marsenau's user avatar
  • 399
6 votes
2 answers
325 views

Is it possible to simultaneously call multiple regression coefficients significant?

Okay, this is a thought experiment: Suppose you have a dataset with 40 covariates. Suppose the data has every nice theoretical property you could want: randomly sampled, variables not correlated, etc....
user avatar
2 votes
1 answer
961 views

Explaining Non-Significant Moderations

Schools often teach us how to conduct and interpret Moderations. What they don't teach us is how to explain why a moderation didn't work out for statistical/methodological reasons. Assuming that the ...
Zoidberg_709's user avatar
0 votes
2 answers
686 views

How to tell if my mean values are not significantly different? [duplicate]

I am looking to test if two mean and standard deviation values I obtain are not significantly different (comparing a sensor method to the gold standard). I am planning on using a two-tailed t-test in ...
Eric's user avatar
  • 131
3 votes
3 answers
148 views

Why can a likelihood ratio not give evidence for the null since it is a model comparison?

I am curious as to why a likelihood ratio cannot give positive evidence for the null, since it is a model comparison. Indeed, this is more confusing given the fact that Bayes Factors are similar ...
HereItIs's user avatar
  • 121
4 votes
0 answers
432 views

Longitudinal paired analysis

I need your advice regarding a complicated design. I am testing data regarding new eye drops that suppose to decrease some quantitative measure. For every subject, one eye is randomly assigned with ...
user41883's user avatar
2 votes
1 answer
355 views

Interpretting the p-value when inverting the null hypothesis

I'm performing an analysis by fitting data points to an exponential distribution and testing the adequacy of this fit using the Kolmogorov-Smirnov test. The standard ks test null hypothesis: the data ...
pvalue_null_hypothesis's user avatar
4 votes
1 answer
261 views

TOST and its two null hypotheses

Background I have a device which is used to size potatoes. I want to use statistics to assess how accurate this device is. To that end, I've collected two data sets, $X$ and $Y$, where $X$ is the set ...
Tom Hosker's user avatar
0 votes
0 answers
373 views

Two way ANOVA or ANCOVA

I need to show that BMI of adults is neither age nor gender specific. Should I do ANCOVA or randomly make age groups and do two way ANOVA?
user53740's user avatar
  • 105
2 votes
1 answer
222 views

If my normality test is non-significant, am I safe to use the t-test?

I took a 30 unit sample from a population. The sample distribution resulted to be normal. Can I state that the population distribution is normal too? If so, with what level of confidence?
Nikolai Felix's user avatar

15 30 50 per page