On 12/22/2016 11:37 PM, Fred Cisin wrote: > NO source is completely reliable. > > >> http://jeremyreimer.com/m-item.lsp?i=137 > http://jeremyreimer.com/uploads/notes-on-sources.txt > > He does provide some information on his sources. > > When we talk about sales, are we talking about UNITS, or about dollars? > (an important distinction for such as the ZX80 V anything else!) > > > His curve fitting is flawed. For example, in his 1975 to 1981 graph, > he has points for sales of TRS-80 of ZERO in 1976, and LOTS in 1977. > But, then he just drew a straight line, which erroneously implies a > linear increase, with sales in 1976. THAT derivative should be a > vertical line, not a slope, unless/until you add more resolution for > months, instead of years, representing an extremely steep slope in the > end of 1977. > As someone that was on the front end of the TRS80 it went from Zero to 60 in '77 as the first deliveries were a batch of 1000 then 5000 to the stores. they sold very fast far faster than expected. Indeed the first 12 months had a very steep curve.
Most number and data I see to day in the popular media is just plain wrong. Allison