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2023/9/19 12 biostatistics - Coggle Diagram
2023/9/19 12 biostatistics
data variability
mean (stick with) variance
data
qualitative
nominal
mutually exclusive, x ranking
ordinal
mutually exclusive, v ranking
interval
quantitative
graphical presentation
pie chart :cry:
5 can't see, take up space, colour printing
histogram
different interval sizes, too much info vs unclear
point & interval estimation (good estimator: SD small, CI narrow)
unbiased
consistent
precision
larger sample size, smalle SE (more precise) (but not changing SD) SD measures variability
CI confidence interval too big, not useful
type I error (extreme values, too rare to be true, but really true)
student's t distribution (small sample size)
normal distribution
one-sided, two-sided P value (statistical significance)
binominal distribution (mutually exclusive) - normal approximation to binominal
area under the distribution
positvely & negatively skewed (left hand & right hand)