metode riset akuntansi measurement and sampling. measurement measurement in research consists of...
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Metode Riset AkuntansiMetode Riset AkuntansiMeasurement and SamplingMeasurement and Sampling
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MeasurementMeasurement
Measurement in research consists of assigning numbers to empirical events, objects, or properties, or activities in compliance with a set of rules
Measurement in research consists of assigning numbers to empirical events, objects, or properties, or activities in compliance with a set of rules
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MeasurementMeasurement
Selecting measurable phenomena
Developing a set of mapping rules
Applying the mapping ruleto each phenomenon
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Measurement ScalesMeasurement Scales
Several types of measurement are possibleDepends on what you assume about
mapping ruleMapping rules have four
characteristics:ClassificationOrderDistanceOrigin
Several types of measurement are possibleDepends on what you assume about
mapping ruleMapping rules have four
characteristics:ClassificationOrderDistanceOrigin
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Types of Scales Types of Scales
OrdinalOrdinal
IntervalInterval
RatioRatio
NominalNominal
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Levels of Measurement Levels of Measurement
OrdinalOrdinal
IntervalInterval
RatioRatio
NominalNominal ClassificationClassification
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Levels of Measurement Levels of Measurement
OrdinalOrdinal
IntervalInterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
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Levels of Measurement Levels of Measurement
OrdinalOrdinal
IntervalInterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
OrderOrderClassificationClassification DistanceDistance
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Levels of Measurement Levels of Measurement
OrdinalOrdinal
IntervalInterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
OrderOrderClassificationClassification DistanceDistance
Natural OriginNatural Origin
OrderOrderClassificationClassification DistanceDistance
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Sources of ErrorSources of Error
Respondent
InstrumentMeasurer
Situation
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Evaluating Measurement Tools
Evaluating Measurement Tools
CriteriaCriteria
Validity
Practicality ReliabilityReliability
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Evaluating Measurement Tools
Evaluating Measurement Tools
Validity is the extent to which a test measures what we actually wish to measure
Reliability has to do with the accuracy and precision of a measurement procedure
Practicality is concerned with a wide range of factors of economy, convenience, and interpretability
Validity is the extent to which a test measures what we actually wish to measure
Reliability has to do with the accuracy and precision of a measurement procedure
Practicality is concerned with a wide range of factors of economy, convenience, and interpretability
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ValidityValidity
Two major forms:External validity: data’s ability to be
generalizedInternal validity: the ability of a
research instrument to measure what it is purported to measure
Two major forms:External validity: data’s ability to be
generalizedInternal validity: the ability of a
research instrument to measure what it is purported to measure
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Validity DeterminantsValidity Determinants
Content
ConstructCriterion
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Content ValidityContent Validity
The extent to which it provides adequate coverage of the investigative questions guiding the study
The extent to which it provides adequate coverage of the investigative questions guiding the study
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Increasing Content ValidityIncreasing Content Validity
ContentLiterature Search
Literature Search
Expert Interviews
Expert Interviews
Group Interviews
Group Interviews
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Validity DeterminantsValidity Determinants
Content
Construct
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Construct ValidityConstruct Validity
Consider both theory and the measuring instrument being used
Consider both theory and the measuring instrument being used
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Validity DeterminantsValidity Determinants
Content
ConstructCriterion
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Criterion-Related ValidityCriterion-Related Validity
Reflects the success of measures used for prediction or estimation
Reflects the success of measures used for prediction or estimation
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Understanding Validity and Reliability
Understanding Validity and Reliability
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Reliability EstimatesReliability Estimates
Stability
InternalConsistency
Equivalence
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PracticalityPracticality
Economy InterpretabilityConvenience
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Methods of ScalingMethods of Scaling
Rating scalesHave several response categories and
are used to elicit responses with regard to the object, event, or person studied.
Ranking scalesMake comparisons between or among
objects, events, persons and elicit the preferred choices and ranking among them.
Rating scalesHave several response categories and
are used to elicit responses with regard to the object, event, or person studied.
Ranking scalesMake comparisons between or among
objects, events, persons and elicit the preferred choices and ranking among them.
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Simple Category/Dichotomous Scale
Simple Category/Dichotomous Scale
I plan to purchase a MindWriter laptop in the 12 months.
YesNo
Nominal Data
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Multiple-Choice, Single Response Scale
Multiple-Choice, Single Response Scale
What newspaper do you read most often for financial news?
East City GazetteWest City TribuneRegional newspaperNational newspaperOther (specify:_____________)
Nominal Data
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Multiple-Choice, Multiple Response Scale
Multiple-Choice, Multiple Response Scale
What sources did you use when designing your new home? Please check all that apply.
Online planning servicesMagazinesIndependent contractor/builderDesignerArchitectOther (specify:_____________)
Nominal Data
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Likert ScaleLikert Scale
The Internet is superior to traditional libraries forcomprehensive searches.
Strongly disagreeDisagreeNeither agree nor disagreeAgreeStrongly agree
Interval Data
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Semantic DifferentialSemantic Differential
Interval Data
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Numerical ScaleNumerical Scale
Ordinal or Interval Data
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Multiple Rating List ScalesMultiple Rating List Scales
Interval Data
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Stapel ScalesStapel Scales
Interval Data
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Constant-Sum ScalesConstant-Sum Scales
Interval Data
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Graphic Rating ScalesGraphic Rating Scales
Interval Data
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Ranking ScalesRanking Scales
Paired-comparison scale Forced ranking scale Comparative scale
Paired-comparison scale Forced ranking scale Comparative scale
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Paired-Comparison ScalePaired-Comparison Scale
Ordinal Data
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Forced Ranking ScaleForced Ranking Scale
Ordinal Data
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Comparative ScaleComparative Scale
Ordinal or Interval Data
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The Nature of SamplingThe Nature of Sampling
The basic idea of sampling is that by selecting some of the elements in a population, we may draw conclusions about the entire population
The basic idea of sampling is that by selecting some of the elements in a population, we may draw conclusions about the entire population
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The Nature of SamplingThe Nature of Sampling
Population element: the individual participant or object on which the measurement is taken
Population: total collection of elements about which we wish to make some inferences
Census: a count of all the elements in a population
Sample frame: listing of all population elements from which the sample will be drawn
Population element: the individual participant or object on which the measurement is taken
Population: total collection of elements about which we wish to make some inferences
Census: a count of all the elements in a population
Sample frame: listing of all population elements from which the sample will be drawn
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Why Sample?Why Sample?
Greater accuracy
Availability of elements
Availability of elements
Greater speed
Greater speed
Sampling provides
Sampling provides
Lower costLower cost
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What Is A Good Sample?What Is A Good Sample?
PrecisionAccuracy
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AccuracyAccuracy
Accuracy is the degree to which bias is absent from the sampleSystematic varianceIncreasing the sample size
Accuracy is the degree to which bias is absent from the sampleSystematic varianceIncreasing the sample size
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PrecisionPrecision
A measure of how closely the sample represents the populationMeasured by the standard error of
estimate
A measure of how closely the sample represents the populationMeasured by the standard error of
estimate
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Sampling DesignsSampling Designs
Probability samplingElements in the population have
some known chance or probability of being selected as sample subjects
Nonprobability samplingElements do not have known or
predetermined chance of being selected as subjects
Probability samplingElements in the population have
some known chance or probability of being selected as sample subjects
Nonprobability samplingElements do not have known or
predetermined chance of being selected as subjects
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Types of Sampling DesignsTypes of Sampling Designs
Element Selection
Probability Nonprobability
Unrestricted Simple random Convenience
Restricted Complex random
Purposive
Systematic Judgment
Cluster Quota
Stratified Snowball
Double
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Simple RandomSimple Random
Purest form of probability sampling
Purest form of probability sampling
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Simple RandomSimple Random
Advantages Easy to
implement
Advantages Easy to
implement
Disadvantages Requires list of
population elements
Time consuming Can require larger
sample sizes
Disadvantages Requires list of
population elements
Time consuming Can require larger
sample sizes
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SystematicSystematic
Every kth element in the population is sampled, beginning with a random start of an element in the range of 1 to k
Every kth element in the population is sampled, beginning with a random start of an element in the range of 1 to k
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SystematicSystematic
Advantages Simple to design Easier than
simple random
Advantages Simple to design Easier than
simple random
Disadvantages Periodicity within
population may skew sample and results
Trends in list may bias results
Disadvantages Periodicity within
population may skew sample and results
Trends in list may bias results
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StratifiedStratified
The process by which the sample is constrained to include elements from each of the segments
The process by which the sample is constrained to include elements from each of the segments
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StratifiedStratified
Advantages Increased
statistical efficiency
Provides data to represent and analyze subgroups
Enables use of different methods in strata
Advantages Increased
statistical efficiency
Provides data to represent and analyze subgroups
Enables use of different methods in strata
Disadvantages Especially expensive
if strata on population must be created
Disadvantages Especially expensive
if strata on population must be created
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StratifiedStratified
Proportionate: sample drawn from the stratum is proportionate to the stratum’s share of the total population
Disproportionate
Proportionate: sample drawn from the stratum is proportionate to the stratum’s share of the total population
Disproportionate
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Cluster Cluster
Advantages Economically
more efficient than simple random
Easy to do without list
Advantages Economically
more efficient than simple random
Easy to do without list
Disadvantages Often lower
statistical efficiency due to subgroups being homogeneous rather than heterogeneous
Disadvantages Often lower
statistical efficiency due to subgroups being homogeneous rather than heterogeneous
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Stratified and Cluster Sampling
Stratified and Cluster Sampling
Stratified Population divided
into few subgroups Homogeneity
within subgroups Heterogeneity
between subgroups
Choice of elements from within each subgroup
Stratified Population divided
into few subgroups Homogeneity
within subgroups Heterogeneity
between subgroups
Choice of elements from within each subgroup
Cluster Population
divided into many subgroups
Heterogeneity within subgroups
Homogeneity between subgroups
Random choice of subgroups
Cluster Population
divided into many subgroups
Heterogeneity within subgroups
Homogeneity between subgroups
Random choice of subgroups
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Area SamplingArea Sampling
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DoubleDouble
It may be more convenient or economical to collect some information by sample and then use this information as the basis for selecting a subsample for further study
It may be more convenient or economical to collect some information by sample and then use this information as the basis for selecting a subsample for further study
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DoubleDouble
Advantages May reduce costs
if first stage results in enough data to stratify or cluster the population
Advantages May reduce costs
if first stage results in enough data to stratify or cluster the population
Disadvantages Increased costs if
discriminately used
Disadvantages Increased costs if
discriminately used
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Nonprobability SamplingNonprobability Sampling
Cost
FeasibilityFeasibility
TimeTime
IssuesIssues
No need to generalize
Limited objectivesLimited
objectives
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Nonprobability Sampling Methods
Nonprobability Sampling Methods
ConvenienceConvenience
JudgmentJudgment
QuotaQuota
SnowballSnowball
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ConvenienceConvenience
Collection of information from members of the population who are conveniently available to provide it
Collection of information from members of the population who are conveniently available to provide it
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PurposivePurposive
Conform to some criteria set by the researcherJudgment samplingQuota sampling
Conform to some criteria set by the researcherJudgment samplingQuota sampling
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SnowballSnowball
Individuals are discovered and this group is then used to refer the researcher to others that possess similar characteristics and who, in turn, will identify others
Individuals are discovered and this group is then used to refer the researcher to others that possess similar characteristics and who, in turn, will identify others