Interlaboratory Comparison (ILC)

To be allowed to submit data the measurement equipment used must pass an inter-laboratory comparison (ILC) at least every four years. This means that if you measure your own data you have to participate. If you are using a test lab, the test lab has to participate.

Due to the large number of IGDB submitters these ILCs are typically parallel, i.e. each participant will get their own set of samples. 

The following properties of the data are required to pass the ILC:

·         Data should be physical, i.e. transmittance should be in the interval from zero to one.  An exception is noise that for extremely low or high values records as outside the physical values, these values are acceptable as long as the smoothed values are physical.  

·         There should be no systematic errors in the data, such as, but not limited to, discontinuities and absorption artifacts.

·         As a rule of thumb data should be within two standard deviations of the average to not be considered an outlier. This might vary depending on what property is being studied, the magnitude of the value, and the magnitude of the variance in the sample.