[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: Graphing change over time of a categorical variable
I was hoping that somebody out there could help me:
I began doing this in Visual Basic (after summarising the data in STATA and copying the table to EXCEL), but thought perhaps it would be possible to do this in STATA. I will describe the problem using one of the variables in our longitudinal study...
Couple no children
Couple with children
Over time individuals will move between these different household types (usually in fairly predictable ways), unfortunately by the fifth sampling wave the possible combinations (i.e. the number of different possible household types and individual has been part of over time) becomes unwieldy and difficult to summarise.
Given that the groups we often disseminate results tend to be statistically na´ve (government and community agencies/groups), presenting complex information graphically becomes essential.
A simple 2 wave example would be
Wave 1 Wave 2
Sole Person Sole Person
Sole Person Sole Parent
Sole Person Couple no children
Sole Person Couple with children
Sole Person Shared House/Flat
Sole Person Other
Sole Parent Sole Person
Sole Parent Sole Parent
Sole Parent Couple no children
Sole Parent Couple with children
Sole Parent Shared House/Flat
Sole Parent Other
Couple no children Sole Person
Couple no children Sole Parent
Couple no children Couple no children
Couple no children Couple with children
Couple no children Shared House/Flat
Couple no children Other
My idea was to have arrows between the categories (like a path diagram), where the arrow will represent a summary variable (e.g. %, mean, or mean of a second variable) in its thickness. Over successive sampling waves, by filtering out all but those who began in say a couple with children household, you could map which households individual were more likely to have moved to over time (and conversely least likely).
Have I described the problem adequately?
* For searches and help try: