Some points to note:

1. One of the limitations of the data is that it doesn't say if people were shopkeepers, though there were bakers, butchers, drapers, grocers and petrifactioners as well as one tobacco dealer and a tea dealerworking in the Matlocks. Most of them would have also been shopkeepers.
   It may help to compare the names in the EDs with those listed in Pigot's Directory, 1842 to see who were shopkeepers.
   
   
2. Another limitation of the 1841 census generally is the lack of proper addresses.
   
   
3. Unless someone lived at the place they worked it is not possible to work out who they worked for or whether they were self employed.
   
   
4. If we look at the Count of Occupation by Enumeration District, shown in the table below, we can see that 75% of the Farmers and Ag Labs were living in the combined EDs of what was mostly Matlock (ED16, ED17, ED18). However, of those designated as Labourer, 41% were in Scarthin (ED13). Almost 57% of the parish's Cotton Spinners resided in Scarthin, too, yet there were 40 Frame Work Knitters on the Bank (ED16). This was over 83% of the total number of FWKs in the parish.
   
   
5. Female Servants outnumbered their Male counterparts by approximately 3 : 1 (see Servants, below). Not unexpectedly, nearly 48% of the total number of Female Servants were in Matlock Bath where the parish's seven Victuallers had businesses. Just under a third of those classed as Independents were in Matlock Bath, closely followed by the 28% residing in Scarthin. In the support occupations providing clothing and shoes there were 57 Shoemakers / Cordwainers, 27 Dressmakers or Tailors and 26 making hats or straw bonnets.
   
   
6. Whilst the majority of occupations are the same as the census schedule, a number of spelling variants have been harmonised to produce a single entry, provided there is no ambiguity. The eagle eyed might notice one curious entry. Anthony Knowles of Holt Lane was initially a miner (see daughter's baptism), but became a Toll Contractor (see onsite wills calendars) though here his occupation reads Sh M. The entry is transcribed as Shoe M elsewhere, but in view of his occupation at other times this does not seem likely. Whilst the Enumerator may have made a mistake, no other shoemakers in Matlock and District are recorded as Sh M. Any suggestions are welcome.

Also see (external links, so will open in a new page):
The Instructions to the Enumerators from the 1841 Census
A Vision of Britain through Time is an excellent website. There is a section on Occupations found in the 1841 census

With grateful thanks to Andy Andrews for his help in producing the above table.