What value to enter?

#1
A friend of mine is entering data that she has collected into a database and has the following question:

The sensitivity of reporting for insulin is no lower than 2 ulU/ml. If
it is lower than this, they simply report <2. What do you think is the
best way to input this as a number value? The range of our entire
insulin data is from <2 to 34.6. Only one individual has insulin as
low as <2. Her insulin has a much smaller range at <2 to 3.85. I
don't know if taking <2 as insignificant (ie. 0) or as an average (ie.
1) would be best.
Any ideas on what she should enter for this person into the database?
 
#2
Hi,

I'm no expert, but in this situation I'd be tempted to use the value 1 over the value 0.

My intuitive reason would be that - assuming observations are uniformly distributed throughout the interval 0 to <2 - the probability that 0 is lower than her actual value is 1 (or close to it), while the probability that the value 1 is higher or lower than her actual value is 0.5.

I'm a bit rusty on my stats theory, but there's probably some stats proof for taking the mid point of an interval. Maybe it's the maximum likelihood estimator (?) or something...:D
 
#3
Hi,

I'm no expert, but in this situation I'd be tempted to use the value 1 over the value 0.

My intuitive reason would be that - assuming observations are uniformly distributed throughout the interval 0 to <2 - the probability that 0 is lower than her actual value is 1 (or close to it), while the probability that the value 1 is higher or lower than her actual value is 0.5.

I'm a bit rusty on my stats theory, but there's probably some stats proof for taking the mid point of an interval. Maybe it's the maximum likelihood estimator (?) or something...:D
Thanks so much for the input. I've never had to deal with this problem before, so I'm completely at a loss as to how to go about it.