Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
"Ploutz-Snyder, Robert (JSC-SK)[USRA]" <robert.ploutz-snyder-1@nasa.gov> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
st: Is this a situation for mlogit? xt-flavor of mlogit? |

Date |
Mon, 2 Aug 2010 14:40:08 -0500 |

Stata Colleagues; I'm at a loss for how to analyze the following data and am looking for suggestions. Everything that I think of seems to have flaws... maybe I'm over thinking things a bit? Maybe I just need more coffee? Experimental Design: 3(times)x2(groups)x4(celltypes) mixed factorial. (random ID: repeated on time & celltypes) More specifically ->Blood data are collected from children at roughly three times per child (varname = age). (Experimental protocol was to collect data at approx 12, 18 & 24 months of age, but we have true age recorded in the dataset. There are some missing data.) ->Two groups of kids (independent measures factor. Varname = group) ->At each of the three repeated times, my outcomes data are the proportion of cells belonging to each of 4 categories. Thus the 4 "categories" of blood cells total to 1 (within rounding error) per child, per time point. (varname=y) We want to examine/compare the effects of group, age and group#age on the distribution among the 4 cell type. I don't typically work with this kind of data, but I think it is a situation in which mlogit would be appropriate, Yes? If so, is there an xt flavor of mlogit that would be better than mlogit with robust errors? Rob * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

- Prev by Date:
**st: By: "by varlist1 (varlist2) , how to perform command by varlist2)** - Next by Date:
**st: RE: re: RM ANOVA, was SPSS vs. Stata** - Previous by thread:
**st: By: "by varlist1 (varlist2) , how to perform command by varlist2)** - Next by thread:
**st: RE: re: RM ANOVA, was SPSS vs. Stata** - Index(es):