Stata tsset

-tsset- declares a time series dataset.

Usage

. webuse gdp2
(Federal Reserve Economic Data, St. Louis Fed)

. tsset daten

Time variable: daten, 01jan1952 to 01oct2010, but with gaps
        Delta: 1 day

. tsset tq

Time variable: tq, 1952q1 to 2010q4
        Delta: 1 month

Stata will indicate if there are gaps in observations. A common issue is misspecifying the time units (e.g., specifying a date for time series data that was collected weekly)

Operators

Time series variable operators:

• L.foo = lagged reference

• LN.foo = reference lagged by N time periods

• F.foo = forward reference

• FN.foo = reference forwarded by N time periods

• D.foo = difference between L.foo and foo

• DN.foo = difference between LN.foo and foo

• S.foo = seasonal difference between L.foo and foo

• SN.foo = seasonal difference between LN.foo and foo

Note also that the operators are case-insensitive.

As an example:

webuse gdp2
tsset tq

// Create new variables
generate l_gdp_ln = l.gdp_ln
generate l_l_gdp_ln = l2.gdp_ln

// Directly reference
regress gdp_ln l.gdp_ln

Analysis

twoway (line gdp_ln tq)

See also

Stata manual for -tsset-

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