The Total column shows the total number of people in that county or town with this surname.
For example, there were 1,312 people called BIRTWELL in Pendleton In Clitheroe at the time of the 1881 census.
The Frequency column shows the percentage of people in this county or town
with this surname. For example, a frequency of 2295.0820 in Pendleton In Clitheroe means that
2295.0820% of the people in Pendleton In Clitheroe on census day were called BIRTWELL.
The Index column shows the relative probability of finding someone called BIRTWELL
in this county or town, compared with the probability of finding them anywhere in Britain as a whole.
An index of 1 means that if you pick someone at random from this county or town, you have exactly the same
probability of picking someone called BIRTWELL as if you picked at random from the whole of the UK.
Where the index is higher than 1, then you are more likely to find someone called BIRTWELL here
than if you picked from the UK as a whole, and where it's lower then you are less likely. The actual figure
shows the level of probability - for example, a figure of 2 would indicate that you are twice as likely to find
someone called BIRTWELL here than in the UK as a whole, and 10 would make it ten times as likely.
The value of 1.31 in Pendleton In Clitheroe means that you are 1.31 times as likely to find
someone with the surname of BIRTWELL in Pendleton In Clitheroe than you would be in the whole of the UK.