# Biostatistics

 The flashcards below were created by user arsantos5 on FreezingBlue Flashcards. Statistics is the science of collecting, processing, analyzing and interpreting data in such a way that conclusions can be drawn in an objective manner. Biostatistics pertains to statistics as applied to the biological and health sciences Descriptive statistics number of students receiveing an A State & Federal statistics (pregnancy rate among women under the age of 16, number of cases of AIDS reported yearly, unemployment rate) Proportion of study subjects receiving a new experimental drug who are cured of their disease Inferential Statistics Determining the factors that increase the risk of an individual developing coronary heart disease Establishing whether a laparoscopic surgical procedure results in a shorter recovery period than a more invasive, traditional alternative compare the effectiveness of two drugs that are often prescribed to patients who suffer from arthritis asessing the reduction of child mortality in MVA resulting from the use of seat belts. Probability the science of characterizing the behavior of random phenomena population Parameter the complete set of objects of interest Sample subset of a population Categorical Nominal or ordinal Numerical Discrete or continuous Nominal values are unordered categories or classes for which there is not a natural ordering ex: political affiliation, gender, marital status Ordinal There is a natural ordering among the category values ex: injury severity scale, activity level, severity of disease Discrete data values are counts. Both order and magnitude are important. They tell how many were observed ex: # of live births, # of deaths attributed to a given cause, # of relapses of a disease observed in a given time frame whole # Continuous Data that can take on any decimal value within a given range ex: height or weight, distance, time, temperature Tables are a common method of displaying data, especially for categorical or discrete data absolute frequency number of units in a given category Relative Frequency proportion of the total count Cumulative Relative Frequency percentage of the total count (total number of observations) that have a value less than or equal to the upper limit of the interval Two ways to summarize a distribution GraphicalArithmetic Bar Charts very common and are used to show the frequency/relative frequency observed in differnet (nominal or ordinal) categories Histogram is a graphical representation of a frequency or relative frequency distribution Box Plots a graphical representation of the quartiles of a data set. They also indicate unusual data values. Atypical values in a data set are outliers. Symmetric the left side is a mirror image of the right side Skewed Left if the majority of the area of the box plot is on the right, and the area gradually trails off on the left. Skewed Right If the majority of the area of the box is on the left and the area gradually trails off to the right. Authorarsantos5 ID282109 Card SetBiostatistics DescriptionLecture 1, 1a Updated2014-09-04T22:41:48Z Show Answers