What Does VIF Mean in Construction?

February 10, 2024

VIF is an abbreviation for Verify in Field. It is frequently found on construction drawings indicating dimensions that need to be verified in the field for accuracy. These dimensions are generally difficult or impossible to determine at the time of development of the construction documents for several reasons and occurrences. These situations include:

One of the main functions of the VIF (or tolerance) statistic is to test whether there is multicollinearity in a regression model. Multicollinearity occurs when a set of independent variables are highly correlated and, as a result, the estimated coefficients are inflated. A high value of the VIF statistic would indicate that there is a strong correlation between your predictors and the dependent variable.

In general, a lower VIF value is better. A lower VIF value indicates that there is less multicollinearity in your model. This is good because it means that the results of your regression analysis are more likely to be accurate.

For a construction project, it is important that contractors and construction managers clearly understand the implications of having dimensions identified as VIF dimensions. It is vital that they have a representative of the design team present when these dimensions are being verified in the field. It is also crucial that these representatives understand the scheduling ramifications of this activity. If this is not done, there could be serious consequences to the overall project schedule and construction budget. For this reason, it is very important that all of these requirements are clearly identified in the project construction schedule.

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