求助stata如何计算面板数据的转移矩阵？

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今有以面板数据     hhid为农户代码，year为年，worker为务工状况(1为务工，0为非务工)

hhid	year	worker
10001	2009	1
10001	2011	0
10002	2009	0
10002	2011	1
10003	2009	1
10003	2011	1
10004	2009	0
10004	2011	0
10005	2009	0
10005	2011	1

求问怎么通过stata,计算转移矩阵？

转移矩阵

	2011年
2009年	务工	非务工
务工	1	1
非务工	2	1

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关键词：求助stata Stata tata 面板数据 worker 如何 2011

Title

    [XT] xttab -- Tabulate xt data


Syntax

        xttab varname [if]

        xttrans varname [if] [, freq]

    A panel variable must be specified; use xtset.
    by is allowed with xttab and xttrans; see [D] by.


Menu

    xttab

        Statistics > Longitudinal/panel data > Setup and utilities > Tabulate xt data

     xttrans

        Statistics > Longitudinal/panel data > Setup and utilities > Report transition probabilities


Description

    xttab, a generalization of tabulate oneway, performs one-way tabulations and decomposes counts into between and
    within components in panel data.

    xttrans, another generalization of tabulate oneway, reports transition probabilities (the change in one
    categorical variable over time).


Option

        +------+
    ----+ Main +-----------------------------------------------------------------------------------------------------

    freq, allowed with xttrans only, specifies that frequencies as well as transition probabilities be displayed.


Examples

    Setup
        . webuse nlswork
        . xtset id year

    xttab
        . xttab msp
        . xttab race

    xttrans
        . xttrans msp
        . xttrans msp, freq