PSID2

The data come from the Panel Study of Income
Dynamics, years 1981 to 1992 (also contains earnings
data from 1980). The sample consists of 579 white
females, who were followed over the considered period.
In total, there are 6,948 observations over the 12-year
period (1981-1992). This data frame contains the following
columns:<ul>
<li>id: Individual identifier</li>
<li>year: Survey year</li>
<li>age: Calculated age in years (based on year and month of birth)</li>
<li>educ: Years of schooling</li>
<li>children: Total number of children in family unit, ages 0-17</li>
<li>s: Participation dummy, =1 if worked (hours&gt;0)</li>
<li>lnw: Log of real average hourly earnings</li>
<li>lnw80: Log earnings in 1980</li>
<li>agesq: Age squared</li>
<li>children_lag1: Number of children in t-1</li>
<li>children_lag2: Number of children in t-2</li>
<li>lnw2: Log of real average hourly earnings</li>
<li>Lnw: Log of real average hourly earnings</li>
</ul>

datasets

In order to facilitate the adjustment of the sample selection models
existing in the literature, we created the 'ssmodels' package. Our package
allows the adjustment of the classic Heckman model (Heckman (1976),
Heckman (1979) <doi:10.2307/1912352>), and the estimation of the parameters of
this model via the maximum likelihood method and two-step method, in addition
to the adjustment of the Heckman-t models introduced in the literature by
Marchenko and Genton (2012) <doi:10.1080/01621459.2012.656011> and the
Heckman-Skew model introduced in the literature by Ogundimu and Hutton (2016)
<doi:10.1111/sjos.12171>. We also implemented functions to adjust the
generalized version of the Heckman model, introduced by Bastos, Barreto-Souza,
and Genton (2021) <doi:10.5705/ss.202021.0068>, that allows the inclusion of
covariables to the dispersion and correlation parameters, and a function to
adjust the Heckman-BS model introduced by Bastos and Barreto-Souza (2020)
<doi:10.1080/02664763.2020.1780570> that uses the Birnbaum-Saunders
distribution as a joint distribution of the selection and primary regression
variables. This package extends and complements existing R packages such as
'sampleSelection' (Toomet and Henningsen, 2008) and 'ssmrob' (Zhelonkin et al., 2016), providing additional robust and flexible sample selection models.

Fernando de Souza Bastos

ssmodels

Sample Selection Models

Wagner Barreto de Souza

PSID2 function

An object of class <code>data.frame</code> with 6948 rows and 13 columns.

PSID2: Panel Study of Income Dynamics

Description

Usage

Arguments

Format

References

Examples