Statistical Methods Flashcards
• data
• statistical methods
• art
• science
• can neither prove nor disprove anything
• it is just a tool
• discipline concerned with the treatment of numerical data derived from group of individuals
Statistics
• branch of statistics
• applied to biological or medical science
Biostatistics
Biostatistics various steps
generation of hypothesis
collection of data
application of statistical analysis
• know the data
• it’s distribution
• it’s analysis
Biostatistics
In order to draw a valid conclusion
Biostatistics
2 branches of Statistical Method
Descriptive Statistics
Inferential Statistics
Distribution of population measurements by providing types of data, estimates of central tendency, measures of variability
Descriptive Statistics
3 Types Central Tendency
mean, mode, median
Two Types of Variability
standard deviation, correlation coefficient
Used to express the level of certainly about estimates includes hypothesis testing, standard error of mean, confidence interval
Inferential statistics
Three Types of Data
Nominal
Ordinal
Interval
Observation recorded during research constitute
Data
Simply assigned “names” or categories
Nominal Data
Based on presence or absence of certain attributes/characteristics
Nominal Data
Without any ranking between the categories
Nominal Data
It also includes binomial data, which refers to two possible outcomes
Nominal Data
Expressed as scores or ranks. Also called as ordered, categorical or graded data
Ordinal Data
Characterized by equal and definite interval between 2 measurements
Interval Data
Types of Interval Data
Continuous
Discrete
Can take any value within a given range
Continuous Data
Usually assigned integer values i.e does not have fractional values
Discrete Data
Average, Common measure of central tendency, Most widely used in calculations of averages, Least affected by sampling fluctuations
Mean