zero conditional

The first of these sentences is a basic zero conditional with both clauses in the present tense.

The error is a random variable with a mean of zero conditional on the explanatory variables.

Zero conditional.

The "zero conditional" is a pattern independent of tense, simply expressing the dependence of the truth of one proposition on the truth of another:

"Zero conditional" refers to conditional sentences that express a factual implication, rather than describing a hypothetical situation or potential future circumstance (see Types of conditional sentence).

In English language teaching the most common patterns are referred to as first conditional, second conditional and third conditional; there is also a zero conditional and mixed conditional.

In a linear model in which the errors have expectation zero conditional on the independent variables, are uncorrelated and have equal variances, the best linear unbiased estimator of any linear combination of the observations, is its least-squares estimator.