Tagged Questions

30 views

Slope error after transform?

I have a slope $b = 0.9543$ with std err $s_b= 0.1172$ . I compared this to a theoretical slope $\beta_0 = 2$, which is significantly different at the level $p = 0.00044$ (df=4). But what I ...
53 views

How do residuals affect the t-statistic?

Could a t-statistic for a simple regression relationship with a smaller sum of squared residuals but a smaller or less positive slope be larger than that of a plot with a larger sum of squared ...
59 views

Use of linear regression or logistic regression when testing conditioned group differences

Background I have a colleague interested in a particular disease and specifically if the continuous variable $X$ is different between controls and patients. Preliminary results suggest that patients ...
42 views

Comparing means for 2 sets of (paired?) data

N patients with N samples from site A and N from site B (before and after treatment). In both sites we find 1-4 microbes, which are tested for antimicrobial susceptibility to obtain MIC values. I ...
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Can saved regression factor scores be used to test for normality in spss and used for further analysis?

I have already collected my data for my dissertation and as I have many variables I have done a factor analysis to drill down the variables to few factors. Then I have computed the mean of all the ...
24 views

How to handle differences of neocortical parcellations between groups

In my lab, we are currently looking at how two handedness groups (mixed handed and consistent handed) differ in terms of lGI (local Gyrification Index, a cortical folding measure) across 74 different ...
120 views

F test and t test in linear regression model

F test and t test are performed in regression models. In linear model output in R, we get fitted values and expected values of response variable. Suppose I have height as explanatory variable and ...
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566 views

What are some good hard exemplary problem sets to work through to solidify my understanding of statistical concepts?

Over the years, I picked up many Statistics Concepts in by a variety of situations and means. I studied some Statistics maybe for a couple semesters almost 10 years back. But I also picked up concepts ...