In thecontext of the present example, this means in part that thereis. norelationship between quantitative and verbal ability. In more advanced. models of factor analysis, the condition that the factors are independent. of one another can be relaxed. As for the factor means and variances, the. assumption is that thefactors are standardized.
Is a Pap smear safe when you're pregnant? Pap smears aren't just safe during pregnancy, they're actually a routine part of prenatal care. Your doctor will need to know if you're at risk for cervical cancer and will check to see if you have any STDs, which can cause premature births or even blindness. You'll probably have a Pap at your first pregnancy checkup.
Screening is usually done by taking a sample of the mother's blood between the 15th and 20th weeks of pregnancy (16th to 18th is ideal). The multiple markers include: Alpha-fetoprotein screening (AFP). This blood test measures the level of alpha-fetoprotein in the mothers' blood during pregnancy. AFP is a protein normally produced by the fetal liver and is present in the fluid surrounding the fetus (amniotic fluid), and crosses the placenta into the mother's blood.