|Subject:||Re: PSPP linear regression (reference category).|
|Date:||Thu, 29 Sep 2016 09:39:47 -0500|
|User-agent:||Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0|
If I understand your question, you're asking which is is the
category against which each other dummy-coded category is compared?
You select it when you dummy code. When you have K categories, you create K-1 dummy variables and one group has a zero on all K-1 dummy variables. That group is the reference group.
Think about it... the model for that group is missing the dummy coded variable and each of the remaining K-1 variables each have a regression coefficient that compares them to the reference group.
On 9/29/2016 9:13 AM, Jack Drew wrote:
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