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# Thinking about Data: - PowerPoint PPT Presentation

Thinking about Data:. Terms: matrix unit of analysis case variable code. Types of Data.

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Presentation Transcript
• Terms:
• matrix
• unit of analysis
• case
• variable
• code
Types of Data
• Microlevel: data collected on the characteristics of individual cases, people, houses, events, that is, discrete units. For example an individual, with characteristic information on sex, age, state of residence, etc.
• Aggregate: Tabular data representing counts of units falling into particular categories, e.g., populations of states. The state is the unit of analysis; the variables are the name of the state and the population of the state.
Sources of Data
• Survey: collected specifically for the research purpose, e.g., CPS, GSS, census.
• Administrative record: records of immigrant arrivals by port; tax filings; vital registration records; case files of judicial proceedings, health records.
Univariate Statistics
• Types of Variables: Nominal; ordinal, interval, ratio
• Measures of central tendency: mean, median, mode
• Measures of dispersion: standard deviation, ntiles, range, coefficient of variation
• Measures of shape: skewness, kurtosis.
YRBUILT

N of cases 1235

Minimum 888.000

Maximum 929.000

Range 41.000

Sum 1116660.000

Median 904.000

Mean 904.178

95% CI Upper 904.724

95% CI Lower 903.633

Std. Error 0.278

Standard Dev 9.770

Variance 95.451

C.V. 0.011

Skewness(G1) 0.409

SE Skewness 0.070

Kurtosis(G2) -0.528

SE Kurtosis 0.139

CONCOST

1127

20.000

5200.000

5180.000

354277.000

250.000

314.354

332.888

295.820

9.446

317.116

100562.250

1.009

5.563

0.073

59.859

0.146

STATS YRBUILT CONCOST / Mean Min Max SD CV Kurtosis Median Range SEK SEM SES Skewness Sum Variance N CIM=.95