null

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null

(nul)
1. insignificant; having no consequence or value.
2. absent or nonexistent.
3. zero; nothing.

null

Molecular biology
See Null mutation.

Statistics
Completely absent; 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, and the difference 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 in to the average.

null

an absence of information, as contrasted with zero or blank or nil, about a value.

null cell
called also null lymphocyte; see null cell.
null hypothesis
a statistical hypothesis which states that one variable has no association with another variable, or set of variables. That is, the observed results can be explained by chance alone.
null lymphocyte
see null cell.
References in periodicals archive ?
To ensure that the Stock Value can always be calculated, you must first ensure that the Price and QuantityInStock fields can never contain a NULL value.
The two null values suggest that the population value is zero, so it was decided to perform a confirmatory single-mean t-test for the 20-trial case, with the subject as the unit of analysis and MCE of zero.
The field cardinality is the number of values of a field in a set of examples including null values, but excluding missing values.
Using the case-only methodology, we observed that risk for ALL associated with exposure to total THM was elevated among children homozygous for GSTT1 deletion (null genotype) but below the null value with exposure to bromoform; risks for those carrying the CYP2E1 variant G-1259C (allele *5) were elevated for exposure occurring during the prenatal as well as the postnatal period.
println("words "+ words[q] + " k " +(q)); } } 2) Algorithm for Cleansing Null values for(int a=0;a<k;a++) { if(words[a].
Considering the maximum likelihood estimate of the Poisson parameter obtained on the null hypothesis, the proportion of null values is specified by [p.
lt;p>One warning on the tool: If you open a payload's settings and don't close it (click the minus icon), the profile includes all the null values for that payload, which essentially prevents users from accessing those settings.
In practice, the null values of Figure 6 are degraded by mechanical imperfections in transitions and inhomogeneous properties of the transmission lines.
Finally, we will discuss the challenge with null values when trying to create totals on a report.
We believe that the current situation in the MLS community is analogous to the state of research on null values in relational databases in the late 1970s.