Select the best answer
for each question. Check your answers using the answer key in the
appendix.
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SAS date values are
the number of days since which date?
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What is an advantage
of storing dates and times as SAS numeric date and time values?
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They can easily be edited.
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They can easily be read
and understood.
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They can be used in
text strings like other character values.
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They can be used in
calculations like other numeric values.
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SAS does not automatically
make adjustments for daylight saving time, but it does make adjustments
for which one of the following?
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An input data file has
date expressions in the form 10222001. Which SAS informat should you
use to read these dates?
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What is the minimum
width of the TIMEw. informat?
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Shown below are date
and time expressions and corresponding SAS datetime informats. Which
date and time expression cannot be read by the informat that is shown
beside it?
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30May2000:10:03:17.2
DATETIME20.
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30May00 10:03:17.2 DATETIME18.
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30May2000/10:03 DATETIME15.
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30May2000/1003 DATETIME14.
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Suppose your input data
file contains the date expression 13APR2009. The YEARCUTOFF= system
option is set to 1910. How does SAS read the date?
-
Suppose the YEARCUTOFF=
system option is set to 1920. An input file contains the date expression
12/08/1925, which is being read with the MMDDYY8. informat. Which
date appears in your data?
-
Suppose your program
creates two variables from an input file. Both variables are stored
as SAS date values: FirstDay records the start of a billing cycle,
and LastDay records the end of that cycle. What would be the code
for calculating the total number of days in the cycle?
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TotDays=lastday-firstday;
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TotDays=lastday-firstday+1;
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TotDays=lastday/firstday;
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You cannot use date
values in calculations.