= ANES Time Series =

'''ANES time series studies''' are administered around each presidential election. They are all two-wave studies, corresponding to a ''pre-election'' interview and a ''post-election'' interview.

<<TableOfContents>>

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== Weights ==

Since the web mode was added in 2012, separate weights have been made available for the modal samples.

||'''Vintage'''||'''Web interviews'''||'''Face-to-face interviews'''||'''Combined'''||
||2012         ||`weight_web`        ||`weight_ftf`                 ||`weight_full` ||
||2016         ||`V160102w`          ||`V160102f`                   ||`V160102`     ||

For the 2020 vintage:

||'''Sample'''                            ||'''Pre-election'''||'''Post-election'''||
||Full sample                             ||`V200010a`        ||`V200010b`         ||
||Panel sample                            ||`V200011a`        ||`V200011b`         ||
||Web interviews                          ||`V200012a`        ||`V200012b`         ||
||Mixed web/telephony interviews          ||`V200013a`        ||`V200013b`         ||
||Mixed web/video interviews              ||`V200014a`        ||`V200014b`         ||
||Fresh sample                            ||`V200015a`        ||`V200015b`         ||
||All excluding mixed web/video interviews||`V200016a`        ||`V200016b`         ||

For the 2024 vintage:

||'''Sample'''                  ||'''Pre-election'''||'''Post-election'''||
||Face-to-face interviews       ||`V240101a`        ||`V240101b`         ||
||Web interviews                ||`V240102a`        ||`V240102b`         ||
||Face-to-face or web interviews||`V240103a`        ||`V240103b`         ||
||Web interviews or PAPI        ||`V240104a`        ||`V240104b`         ||
||Fresh sample                  ||`V240105a`        ||`V240105b`         ||
||Panel sample                  ||`V240106a`        ||`V240106b`         ||
||Full sample                   ||`V240107a`        ||`V240107b`         ||
||Full sample excluding PAPI    ||`V240108a`        ||`V240108b`         ||

Declare the complex survey design like:

{{{
proc surveyfreq;
  stratum STRATUM;
  cluster CLUSTER;
  weight WEIGHT;
  table VOTE PARTY VOTE*PARTY ;
run;
}}}

Or:

{{{
svyset CLUSTER [pweight=WGT], strata(STRATUM) vce(linearize) singleunit(centered)
}}}

Until the 2006 pilot, clusters and strata were published as a single variable. This could be broken apart like:

{{{
compute STRATUM = trunc(v040103/10).
compute CLUSTER = v040103 ‐ (10*STRATUM)
}}}



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