Is a sign of an offset voltage drift +/- ?

Question

Hi, everyone. 
 
 I have a simple question. 
 I think an offset voltage drift of OP-amps has positive or negative tenpareture coefficiency, but that is not written in data sheets such as OP1117, AD829, and AD8099. 
 On the other hand, a sign of +/- is written in ADA4945's data sheet. 
 
 I want to know a definition of an o ffset voltage drift i n Analog Devices. Absolute value? Standard deviation? 
 Or is that only positive tenpareture coefficiency?

harrynsc · Accepted Answer

For more than 40 years, the datasheets would show an unsigned number for offset. So yes, it is the absolute value. 
 The ADA4945 d.s. is technically more accurate. 
 The TCVos is also an absolute value. Note the graphs usually go from zero to xx microvolts/C. 
 The typicals depend on the group, the apps engineer, the designer, etc and can be an average, a mean, 
 a mean plus one standard deviation, etc. Never design to a typ. You can only count on the max. 
 Harry)

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Is a sign of an offset voltage drift +/- ?