The Total column shows the total number of people in that county or town with this surname.
For example, there were 263 people called LYSON in Eglwys Cymmin 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 1666.6667 in Eglwys Cymmin means that
1666.6667% of the people in Eglwys Cymmin on census day were called LYSON.
The Index column shows the relative probability of finding someone called LYSON
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 LYSON 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 LYSON 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 LYSON here than in the UK as a whole, and 10 would make it ten times as likely.
The value of 0.26 in Eglwys Cymmin means that you are 0.26 times as likely to find
someone with the surname of LYSON in Eglwys Cymmin than you would be in the whole of the UK.