search for: person_2

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2012 Oct 10
7
multiple t-tests across similar variable names
...t to compare. The variables are named "apple_pre" or "pre_banana" with the corresponding post variables named "apple_post" or "post_banana". The variables are in no particular order. apple_pre orange_pre orange_post pre_banana apple_post post_banana person_1 person_2 person_3 ... person_x How do I: 1. Run a series of paired t-tests for the apple_pre variables and pre_banana variables? Would be great to do something like ttest(*.*pre*.*,*.*post*.*). 2. Print the results from these t-tests in a table with col 1=mean difference, col 2= 95% conf interval, col 3=p...
2008 May 27
2
HABTM using two columns
Hi all, I was wondering whether anyone could guide me to docu and code examples how to create and use a has_and_belongs_to_many relationship with a joining table where TWO columns are used to identify the relation to TWO alternative tables. Example: table 1: mothers [mother_id, name] table 2: fathers [father_id, name] table 3: children [child_id, name] joining table 4: children_parent