Freaky stats

Stats that make me go freaky

How to compute proportion (in treatments or control groups)

A proportion is computed by dividing the number of successes in a sample by the total number of observations in that group. It is often expressed as a fraction, decimal, or percentage. (19/27 ~ 0.70 → 70%)

Examples for sampling bias

Non-response / Convenience sample (not generalizable to entire population)

Why randomize and make replicable

You randomize to account for variables that cannot be controlled / The more studies are done, the more accurate an estimate will be

What are explanatory variables

independent variables (so the variables you control in an experiment)

what are blocking variables

confounders / non confounders (possible interfering factors) so you take them into account and randomize them

histogram

different modes

what is the variance

The variance is roughly the average squared distance from the mean

What is the standard deviation

The standard deviation is the square root of the variance, and it roughly describes how far away the typical observation is from the mean

What is a box plot

how to compute the sample mean

how to compute the variance

robust statistics

P values

type 1 and 2 errors

What is the P value