regression - Why could centering independent ... - Cross Validated
I want to see how muscle strength, affects bone mass and I want to take into account gender to see if it affects differently in girls and boys. The idea is that the higher the muscle strength the higher the …
interpretation - Intercepts (reference) in linear mixed effect model ...
Statistically, if I choose to use a level with the highest predicted value as the reference, it will mean that all other levels are compared to that reference. Right? In that case, the results interpretation will be …
Change in proportion - two timepoints - Cross Validated
So that is a difference of 5% for boys and 18% for girls between the two time points: I was hoping someone could point me in the right direction as to what test I should use to compare this change …
Significance test for difference in two proportions over time with ...
Oct 8, 2019 · I'm comparing the same proportion across samples of two different populations taken over time. So, for example, the proportion of 3rd graders with blonde hair, comparing boys and girls, if …
Two-way ANOVA when data is non-normally distributed
Jan 27, 2020 · You'll note that the apparent non-normality problem is seen in girls, who outnumber boys by about 2 to 1. With such a restricted range of dependent-variable (DV) values, my initial reaction in …
hypothesis testing - Choosing between a MANOVA and a series of t …
I have to analyze the data from a study in which two groups of subjects (total sample $n = 30$) were tested on 4 cognitive tasks, all related to executive functions ...
self study - Find probability and expectation - Cross Validated
Aug 2, 2012 · Equivalently, the girls must be in the remaining $20-x$ positions, which can occur in $\binom {20-x} {2}$ distinct equiprobable ways out of all the $\binom {20} {2}$ possible pairs of …
Expected number of ratio of girls vs boys birth - Cross Validated
Apr 15, 2014 · Expected girls from one couple$ {}=0.5\cdot1 + 0.25\cdot1 =0.75$ Expected boys from one couple$ {}=0.25\cdot1 + 0.25\cdot2 =0.75$ 1 As I said this works for any reasonable rule that …
distributions - How to compute frequency of overlapping bins when …
Jul 9, 2017 · The writer finds the number of girls aged 18 and above multiplying the number of girls in the bin "15-19" (39 560 000) by a fraction which I don't understand where it comes from.
regression - Building a linear model for a ratio vs. percentage ...
Suppose I want to build a model to predict some kind of ratio or percentage. For example, let's say I want to predict the number of boys vs. girls who will attend a party, and features of the party...