📄 m20 - combining sas data sets - 47 of 49.mht
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Date: Mon, 8 Mar 2004 12:20:03 +0800
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<H2><STRONG><A name=3DText>Text Summary</A></STRONG> </H2>
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concept was presented, select a=20
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<P><STRONG>One-to-One Reading</STRONG><BR>You can combine data =
sets with=20
<A onmouseover=3D"window.status=3D'Display details on one-to-one =
reading.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D'';"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m20/m20_2.htm">one-to-one=20
reading</A> by including multiple SET statements in a DATA step. =
When you=20
perform one-to-one reading, the new data set contains all the =
variables=20
from all the input data sets. If the data sets contain same-named=20
variables, the values that are read in from the last data set =
replace=20
those that were read in from earlier ones. The number of =
observations in=20
the new data set is the number of observations in the smallest =
original=20
data set. </P><PRE> <FONT color=3D#003399>data one2one;</FONT>
<FONT color=3D#003399>set a;</FONT>
<FONT color=3D#003399>set b;</FONT>
<FONT =
color=3D#003399>run;</FONT></PRE><STRONG>Concatenating</STRONG><BR>To=20
append the observations from one data set to another data set, you =
<A=20
onmouseover=3D"window.status=3D'Display details on =
concatenating.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D'';"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m20/m20_7.htm">concatenate</A=
>=20
them by specifying the data set names in the SET statement. When =
SAS=20
concatenates, data sets in the SET statement are read =
sequentially, in the=20
order in which they are listed. The new data set contains all the=20
variables and the total number of observations from all input data =
sets. <PRE> <FONT color=3D#003399>data concat;</FONT>
<FONT color=3D#003399>set a b;</FONT>
<FONT =
color=3D#003399>run;</FONT></PRE><STRONG>Interleaving</STRONG><BR>If=20
you use a BY statement when you concatenate data sets, the result =
is <A=20
onmouseover=3D"window.status=3D'Display details on =
interleaving.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D'';"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m20/m20_11.htm">interleaving<=
/A>.=20
Interleaving intersperses observations from two or more data sets, =
based=20
on one or more common variables. Each input data set must be =
sorted or=20
indexed in ascending order based on the BY variable(s). =
Observations in=20
each BY group in each data set in the SET statement are read =
sequentially,=20
in the order in which the data sets and BY variables are listed, =
until all=20
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