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312-Data Analysis

AICP Data Analysis

QuestionAnswer
sample a subset of population about which data are collected when it is too costly to collect data on entire populaiton
Typical sample size 1% ; larger sample sizes can lead to more accurate results
to increase accuracy larger sample size and random sampling
Nominal or categorical the measures are names or categories; e.g. democrat / republican
Ordinal or ranking there is an order to the different measures; socioeconomic status
Interval where the interval between the different measures has meaning; degrees Celsius, temperature
Ratio properties of interval variables as well as a clear definition of zero; height of building
control variables the independent variables that are not manipulated by the study but may have an impact on the outcome of a project
Mean arithmetic average; not always a good measure of central tendency because extreme values or outliers can distort the statics
Median the 50th percentile; better a measure of central tendency because it is less influenced by outliers than mean
Variance a measure of how spread out a distribution is
Standard deviation the sq root of the variance; used to describe the degree of which a distribution is spread out
Chi square a statics used to suggest whether ther might be a relationship b/w two nominal or categorical variables
Linear regression the influence of one or more independent variables on a dependent variable when certain assumptions are met
Problem Definition 1.define problem;2.specify boundaries of problem;3.develop fact base;4.list goals and objectives;5.identify range of solutions(alternatives);6.define potential costs and benefits;7.review problem statement and refine as appropriate
Created by: Jae Min
 

 



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