201 views

ANOVA for Regression

When using ANOVA to compare means, I understand the null hypothesis is u1=u2=u3.... as we need to combine all groups into a single group when assuming their means are the same. But for ANOVA for ...
1k views

Common statistical tests as linear models

(UPDATE: I dived deeper into this and and posted the results here) The list of named statistical tests is huge. Many of the common tests rely on inference from simple linear models, e.g. a one-sample ...
978 views

Cheat Sheet ANOVA Alphabet Soup & Regression Equivalents

Can I get help completing this tentative (in progress) attempt at getting my bearings on ANOVA's and REGRESSION equivalents? I have been trying to reconcile the concepts, nomenclature and syntax of ...
6k views

R: Anova and Linear Regression

I am new to statistics and I am trying to understand the difference between ANOVA and linear regression. I am using R to explore this. I read various articles about why ANOVA and regression are ...
439 views

What is the intuition behind (M)ANCOVA and when/why should one use it?

As per my understanding here's the what/why/when of the following hypotheses tests in a crude sense: t-test: Used when comparing means between two samples ANOVA (one way): Used when you have one ...
859 views

Analyze count data that does not fit glm - Overdispersion

I am working with camera-trap data on mammals. My data looks like this: ...
9k views

Effect of sample size in F-test?

Having worked hard to understand the t-test, I'm rapidly falling out of love with it. All that is required in the t-test to gain significance is increase sample size, which renders it close to ...
1k views

Advantages of using independent samples T-test over one-way ANOVA for comparing two groups

I'm still confused as to why it is often recommended to use an independent samples T-Test when comparing two means rather than a One-way Anova. If t^2 = F, and the p values are the same, why use a T-...
1k views

For my study design: When to log-transform data vs. when to use a non-parametric approach [duplicate]

Edit Purpose of my study I have weather stations collecting data inside and outside low-tech greenhouses. Four of the weather stations are inside, and one is outside. They are collecting temperature, ...
62 views

20 % of patients are female. Is that enough to include it as a factor?

About 18 % of the patients in a study are females. Is that enough for us to use Gender as a factor? More generally, how does one decide whether there are enough observations such that the factor ...
1k views

MIXED MODEL - can a fixed factor be continuous?

I am using the linear mixed function in SPSS and want to determine whether a continuous variable (attendance) has an effect on the repeated measurement of my DV (<...
36 views

What method can I use to account for differences in group means?

Let's say the mean income in New Jersey (group 1) and Florida (group 2) is $80,000 and$55,000 respectively. Using a dataset of relevant predictor variables, I'd like to attempt to explain this gap (i....
502 views

Comparison of mean values between two periods

An authority has decided to legislate on stricter rules regarding amortization. The previous legislation stated that a mortgage loan has to be amortized down to a degree of at least 75% of the price ...