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# Re: st: Control for the dependency of observations when correlate & ANOVA

 From David Airey <[email protected]> To [email protected] Subject Re: st: Control for the dependency of observations when correlate & ANOVA Date Wed, 9 Jan 2008 09:02:29 -0600

.

You mentioned two variables, parental education and child gender. And then you also mentioned correlation. ANOVA is for continuous dependent variables, and the typical output will not give you correlation directly. Maybe you just meant association between parental education and child gender. That's a strange but interesting association! Since child gender is randomly determined at conception (at least at the population level), your hypothesis is that child gender causes variation in parental education? Causation the other way around assumes the parents had somehow selected the sex of their children by other means. And most parents are done with there education before they give birth, so why do you expect an association? Do you have enough variation in your education variable to treat it as a continuous variable? Even if not, you can find a model that associates parental education (continuous, ordinal, nomimal) with child gender (nominal binary) with the cluster option in Stata. I think you could also find a mixed model in Stata too (xtmixed, xtmelogit, gllamm).

-Dave

On Jan 9, 2008, at 8:40 AM, Wen Jun wrote:

```Thanks. It's another learning. :) - wj

On 1/8/08, David Airey <[email protected]> wrote:
```
```.

Oops. Sorry. I read your post too quickly and even inserted the fact
that you might be studying twin data or genetics when you did not say
that!

-Dave

On Jan 8, 2008, at 5:48 PM, Wen Jun wrote:

```
Hi All,

I am trying to run some descriptive analyses (i.e. correlations,
ANOVA) on two children within one family and want to control for the
dependency of observations. For example, my data include 1000
families and each family has two children. I want to know the
correlation between parenatl education and child gender, but want to
control for the dependency of observation. That is, I don't want to
correlate parental education and child gender for first and second
born specifically. I am a SAS user. I have heard that this is possible
to do in STATA, although I have no idea how to do it. Please give some
suggestions. Thanks!

Best,

Wen
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