ch2 examining your data and missing data syxtax
TRANSCRIPT
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8/16/2019 Ch2 Examining Your Data and Missing Data Syxtax
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GET FILE = 'HBAT.SAV' .
* *************************************************** .
* BASIC DESCRIPTIVE STATISTICS AND GRAPHICS .
* EXAMPLE -- X6 .
TITLE 'BASIC DESCRIPTIVE STATISTICS AND GRAPHICS -- X6' .
EXAMINE
VARIABLES=x6
/PLOT STEMLEAF HISTOGRAM NPPLOT
/STATISTICS DESCRIPTIVES
/CINTERVAL 95
/MISSING LISTWISE /NOTOTAL.
* EXAMPLE -- X6 BY X1 .
TITLE 'BASIC DESCRIPTIVE STATISTICS AND GRAPHICS -- X6 BY X1' .
EXAMINE
VARIABLES=x6 BY x1 /PLOT=BOXPLOT/STATISTICS=NONE/NOTOTAL
/MISSING=REPORT.
EXAMINE
VARIABLES=x7 BY x1 /PLOT=BOXPLOT/STATISTICS=NONE/NOTOTAL
/MISSING=REPORT.
ONEWAY x6 x7 BY x1
/MISSING ANALYSIS
/POSTHOC = SCHEFFE ALPHA(.05).
* *************************************************** .
* EXAMINATION AND REMEDY OF MISSING DATA .
TITLE 'EXAMINATION AND REMEDY OF MISSING DATA -- INITIAL ANALYSIS' .
GET FILE ='HBAT_MISSING.SAV' .
COUNT NMISS = V1 TO V14 (MISSING) .
FREQ NMISS .
* USE MISSING VALUE ANALYSIS (MVA) MODULE IN SPSS .
MVA
v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11 v12 v13 v14
/MAXCAT = 25
/ID = id /CATEGORICAL = v10 v11 v12 v13 v14
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/TTEST PROB PERCENT=5
/DPATTERN DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9
/MPATTERN NOSORT DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9
/TPATTERN NOSORT PERCENT=1 DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9
/LISTWISE
/PAIRWISE /EM ( TOLERANCE=0.001 CONVERGENCE=0.0001 ITERATIONS=100 )
/REGRESSION ( TOLERANCE=0.001 FLIMIT=4.0 NPREDICTORS= 3 ADDTYPE=RESIDUAL ) .
* Delete cases with greater than 50% missing .
TITLE 'MISSING DATA -- DELETE CASES WITH GT 50 PERCENT MISSING' .
GET FILE ='HBAT_MISSING.SAV' .
COUNT NMISS = V1 TO V14 (MISSING) .SELECT IF (NMISS LE 6) .
FREQ NMISS .
MVA
v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11 v12 v13 v14
/MAXCAT = 25
/ID = id
/CATEGORICAL = v10 v11 v12 v13 v14
/TTEST PROB PERCENT=5
/DPATTERN DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9 /MPATTERN NOSORT DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9
/TPATTERN NOSORT PERCENT=1 DESCRIBE=v1 v2 v3 v4 v5 v6 v7 v8 v9
/LISTWISE
/PAIRWISE
/EM ( TOLERANCE=0.001 CONVERGENCE=0.0001 ITERATIONS=100 )
/REGRESSION ( TOLERANCE=0.001 FLIMIT=4.0 NPREDICTORS= 3 ADDTYPE=RESIDUAL ) .
* delete cases with greater than 50% missing and delete v1 .
TITLE 'DELETE CASES GT 50 PERCENT MISSING AND DELETE V1' .
GET FILE ='HBAT_MISSING.SAV' .
COUNT NMISS = V2 TO V14 (MISSING) .
FREQ NMISS .
SELECT IF (NMISS LE 5) .
FREQ NMISS .
MVA v2 v3 v4 v5 v6 v7 v8 v9 v10 v11 v12 v13 v14
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/MAXCAT = 25
/ID = id
/CATEGORICAL = v10 v11 v12 v13 v14
/TTEST PROB PERCENT=5
/MISMATCH NOSORT PERCENT=5
/MPATTERN NOSORT DESCRIBE=v2 v3 v4 v5 v6 v7 v8 v9 /TPATTERN NOSORT PERCENT=1 DESCRIBE=v2 v3 v4 v5 v6 v7 v8 v9
/LISTWISE
/PAIRWISE
/EM ( TOLERANCE=0.001 CONVERGENCE=0.0001 ITERATIONS=100 )
/REGRESSION ( TOLERANCE=0.001 FLIMIT=4.0 NPREDICTORS= 4 ADDTYPE=RESIDUAL ) .