Tag: merge

A Quick Look at SAS DS2 Merge

The code: data a;     input i a $ b $;     datalines;     1 a1A b1     1 a1A b1     2 a2 b2     ; run; data b;     input i a $ c $;     datalines;     1 a1C c1     2 .   c2     3 .  c3     ; run; data […]

First One In Gets the Win

Yikes, it’s been a while since the last update! So I will try to keep this one short and useful. Most everybody knows there are essentially two ways for tables to be merged in SAS: using the merge statement in the data step and using a join in SQL. …

First One In Gets the Win

Yikes, it’s been a while since the last update! So I will try to keep this one short and useful. Most everybody knows there are essentially two ways for tables to be merged in SAS: using the merge statement in the data step and using a join in SQL. …

First One In Gets the Win

Yikes, it’s been a while since the last update! So I will try to keep this one short and useful. Most everybody knows there are essentially two ways for tables to be merged in SAS: using the merge statement in the data step and using a join in SQL. …

Example 8.33: Merging data sets one-to-many

It’s often necessary to combine data from two data sets for further analysis. Such merging can be one-to-one, many-to-one, and many-to-many. The most common form is the one-to-one match, which we cover in section 1.5.7. Today we look at a one-to-man…

Example 8.18: A Monte Carlo experiment

In recent weeks, we’ve explored methods to fit logistic regression models when a state of quasi-complete separation exists. We considered Firth’s penalized likelihood approach, exact logistic regression, and Bayesian models using Markov chain Monte Ca…

How To Get What You Want Out of a Data Step Merge

This Fall my daughter will be going to kindergarden. So like all other hyper-attentive parents we have started introducing her to the concept of homework. The other night I got out her crayons and introduced her to set theory. After about an hour I …