| Glossary Term | Null |
| Definition | In mathematics, a set with no members or of zero magnitude. If a field has a value of null, it means that the value is unknown. A null value is not the same as a value of zero. (To appreciate the difference, consider the terms "free" and "priceless." If something is free, it has a price of zero. If something is priceless, it has no known price. The difference between null and zero can be crucial; for example, when calculating the average value of a field among many records where one row contains a zero, the zero gets factored into the average. If the field has a null value, it does not get factored into the average.) |
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO) |
||
|
Citing These Resources Funding Information Warranty Disclaimer, Privacy Notice, Licensing, & Copyright Send questions and comments to User Support. |
last database update 04/30/2024 MGI 6.23 |
|
|
|
||
Analysis Tools