Analysis of the Vehicle Inventory and Use Survey for Trucks ... - About

PRNPRO 164-165 WANNMIL 166-178 VG 179-180 VBG 181-182 REGION $ 183-185 MAXWT 186-191;
CARDS;
RUN;
II. SAS Program to load VIUS97.dat dataset for the subsequent analyses
DATA VIUS;
INFILE 'C:\SAS\VIUS97.DAT' LRECL=648 MISSOVER;
INPUT FIPST 1-2 EXPANF 3-10 BODTYP 11-12 NAXLE 13-13 LIFTAX 14-14 VEHTYP 15-15
TOTLEN 16-17 PCNTNR 18-20 PPIGY 21-23 WIDTH 24-24 EMPWT 25-30 AVGWT 31-36
ANNMIL 37-42 POBAST 43-45 POFFRD 46-48 PLOCAL 49-51 PSHORT 52-54 PSMED 55-57
PLMED 58-60 PLONG 61-63 OPCALS 64-64 JURISD 65-65 TYPSER 66-66 PNOLOD 67-69
PASSEN 70-72 LVANML 73-75 FARMPD 76-78 PRFOOD 79-81 ANFEED 82-84 MNPRO 85-87
BLDGMA 88-90 LOGPRO 91-93 LUMBER 94-96 PAPER 97-99 CHEM 100-102 PETROL 103-105
PLASTK 106-108 PRIMTL 109-111 FABMTL 112-114 MACHNE 115-117 TEQUIP 118-120
FURN 121-123 GLASS 124-126 TEXTIL 127-129 MSCMFG 130-132 MOVING 133-135 TOOLS
136-138 MXDCAR 139-141 REFUSE 142-144 INDWTR 145-147 HAZEPA 148-150 HAZNEPA
151-153 RECYCLE 154-156 OTHPROD 157-159 FLTSZE 160-162 AXLRE 162-163 PRNPRO
164-165 WANNMIL 166-178 VG 179-180 VBG 181-182 REGION $ 183-185 MAXWT 186-191;
EXPANF=EXPANF/1000;
CARDS;
RUN;
III. SAS Code Used to Create Frequency Tables and to Generate Means
Frequency Tables for Population
Frequency tables were generated in our analysis to determine the number of vehicles in a particular category. For
example, a table, which gives the number of vehicles in the nation that, are in each of the 8 vehicle groups can be
generated by using the frequency procedure in SAS.
General Format
Proc freq data=dataset name;
Table Variable1*Variable2*Variable3;
Weight Variable;
Run;
Example of SAS Code to Generate Table of Number of Vehicles in Each Vehicle Group for Each Region
Proc freq data=Regions;
Table VG*REGION;
Weight EXPANF;
Run;
Frequency Tables for Sample
Frequency tables were also derived to determine the number of data records available for a particular category. The
SAS code is similar to the previous description; however, the ‘Weight EXPANF’ statement, which indicates the
number of vehicles in the population that one record represents, is removed. For example, if we wanted to know the
number of records used to derive the table of the number of vehicles in the nation that are in each of the 8 vehicle
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