Poemita cursi en STATA
I
. use "/Users/Manuel/vida.dta"
. keep corazón if year=you
II
. ttest vida, by (tú)
Two-sample t test with equal variances
------------------------------------------------------------------------------
Group | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval]
---------+--------------------------------------------------------------------
0 | 894 1106.46 21.29501 636.7173 1064.666 1148.254
1 | 531 1176.489 26.41671 608.7317 1124.594 1228.383
---------+--------------------------------------------------------------------
combined | 1425 1132.555 16.61322 627.1355 1099.966 1165.144
---------+--------------------------------------------------------------------
diff | -70.02882 34.32187 -137.3557 -2.701916
------------------------------------------------------------------------------
diff = mean(0) - mean(1) t = -2.0404
Ho: diff = 0 degrees of freedom = 1423
Ha: diff <> 0
Pr(T <> |t|) = 0.0415 Pr(T > t) = 0.9793
