Biostat Flashcards
(21 cards)
Sometimes called as measures of positions. A measure can tell us whether a value is about the average or whether it’s unusually high or low.
Point measures
Are three values that split sorted data into four parts, each with an equal number of observations.
Quartiles
Split the data into ten parts
Deciles
Defined as the difference between the third and the first quartile in the set of data.
IQR (interquartile range)
Is a number where a certain percentage of scores fall below that number.
Percentiles
Is an overview of your data. The statistic in the summery are the smallest(minimum), the largest(maximum) and the middle (median).
Five number summary
Shows the spread and center of data. It is a graphical representation of the five number summary.
Box and Whiskers Plot
Are a way to compare results from a test to a normal population.
Standard Scores
What are the point measures or Measure of position?
Quartiles
Deciles
IQR
Outliers
Percentiles
Five number summary
Box and whiskers plot
Standard score
The simplest and easiest measure of variability.
Range
Is is simply getting the difference between the highest and the lowest score.
Absolute range
Is the difference by subtracting lowest score from the highest score+1.
Total range
The difference between the first and the third quartile.
Interquartile Range
Obtained by taking half the difference of the third and the first quartile.
Semi- interquartile range
Defined as the average deviation of all observation from the mean.
Mean deviation
Is the mean of the squared deviation of the observations for their arithmetic mean.
Variance
The most widely used measure of variations. It is the square root of the variance.
Standard Deviation
The ratio of standard deviation and the mean, which is express in percent.
Coefficient of variations
The difference between first and the third quartile.
Interquartile Range
What are the measures of variability?
Range
Quartile deviation/semi-quartile range
Mean deviation
Variance
Standard deviation
Coefficient of variance
Interquartile range
Are unusual values that fall outside of an expected range of values.
Outliers
