Table 3. Multiple regression of median utterance length with US Census Bureau QuickFacts variables as possible predictors.
| Independent variable | Parameter estimate (standard error) | ||
| 2 | 3 | 4 | |
| 2011 resident Black population in percent B | −2.954 *** | −3.295 *** | −2.645 *** |
| (0.406) | (0.325) | (0.284) | |
| Persons 25 years and over who are high school graduates or higher from 2007 to 2011 in percent H | 0.690 | ||
| (0.453) | |||
| Median household income from 2007 to 2011 in thousands of dollars I | 0.337 | ||
| (0.368) | |||
| Persons 25 years and over who has bachelor’s degree or higher from 2007 to 2011 in percent C | 0.727 ** | 1.332 *** | |
| (0.325) | (0.317) | ||
| 2010 population per square mile D | −1.492 *** | ||
| (0.321) | |||
| Owner-occupied housing units in percent of total occupied housing units from 2007 to 2011 O | −0.900 *** | ||
| (0.271) | |||
| Total value of manufacturing shipments in 2007 M | −0.678 ** | ||
| (0.268) | |||
| Constant | 35.40 *** | 35.40 *** | 35.40 *** |
| (0.322) | (0.321) | (0.252) | |
| r 2 | 0.720 | 0.715 | 0.836 |
| adjusted r 2 | 0.702 | 0.703 | 0.817 |
Standard errors are presented in parentheses below the corresponding parameter estimates. Bold indicates significance at the 5% level, 
.
**
.
***
.