When describing corresponding items in order

Post date: Sep 9, 2011 7:46:03 PM

The following sentences are in the preference order from most to least:

1. Rows and columns of x correspond to observations and variables respectively. (most concise and formal)
2. Rows of X correspond to observations, columns to variables.
3. Rows and columns of x correspond respectively to observations and variables.
4. Rows and columns of x respectively correspond to observations and variables.

Note: 3 and 4 are tied for last