Gavin Hales

If this is at all representative, ordinarily very few people arrested by the Met aren't already known by the police service www.whatdotheyknow.com/request/supe...

Just put any links in a reply

I'm tending towards the view that gaps in police self-defined ethnicity data need not limit the analysis of ethnic disproportionality, as long as ethnic appearance data are well completed. That's because SDE and EA generally align well at the record-level.

I'm tending towards the view that gaps in police self-defined ethnicity data need not limit the analysis of ethnic disproportionality, as long as ethnic appearance data are well completed. That's because SDE and EA generally align well at the record-level.

Around 4/5 s60 stops over the last 2 years (83%) took place in the month of August, and 90% of those took place in Kensington & Chelsea or Westminster. That points to the use of s60 primarily being concerned with Carnival.

As I noted here, there is a generally high degree of agreement between SDE and EA data which suggests that at least for broad ethnic groups EA can be used fairly reliably in combination with SDE or even on its own to examine Qs like disproportionality. bsky.app/profile/gmha...

If you cross-tabulate the self-defined ethnicity (SDE) and ethnic appearance (EA) variables, you'll see that only 3.3% of s60 records have no EA recorded, and the gaps in SDE are almost all 'not stated', which means SDE was requested but not provided.

Around 4/5 s60 stops over the last 2 years (83%) took place in the month of August, and 90% of those took place in Kensington & Chelsea or Westminster. That points to the use of s60 primarily being concerned with Carnival.

As I noted here, there is a generally high degree of agreement between SDE and EA data which suggests that at least for broad ethnic groups EA can be used fairly reliably in combination with SDE or even on its own to examine Qs like disproportionality. bsky.app/profile/gmha...

If you cross-tabulate the self-defined ethnicity (SDE) and ethnic appearance (EA) variables, you'll see that only 3.3% of s60 records have no EA recorded, and the gaps in SDE are almost all 'not stated', which means SDE was requested but not provided.

I wasn't aware until just now that the Home Office recently published the findings of the 2023 Police Activity Survey www.gov.uk/government/p...

I wasn't aware until just now that the Home Office recently published the findings of the 2023 Police Activity Survey www.gov.uk/government/p...

Replication is always helpful, but these tests are independent of policing and the Home Office

This is well worth your time

"The future of autonomous vehicles and policing" www.policeforum.org/trending6dec25

Operational Testing of Facial Recognition Technology Why test? The Metropolitan Police Service (MPS) and South Wales Police (SWP) tested Facial Recognition Technology (FRT) with the National Physical Laboratory (NPL). The NPL is a world-leading centre o...

science.police.uk/delivery/res...

Home Office admits facial recognition tech issue with black and Asian subjects Calls for review after technology found to return more false positives for ‘some demographic groups’ on certain settings

@syalrajeev.bsky.social your article on police retrospective facial recognition has been illustrated with a photo of a live facial recognition operation. The latter tech has been shown to not be biased when used with the correct settings. www.theguardian.com/technology/2...

Facial recognition technology tests: National Physical Laboratory Independent testing of facial recognition algorithms commissioned by the Home Office.

New evaluations of two retrospective #facialrecognition algorithms www.gov.uk/government/p...

Positive outcomes are everything except NFA, so the NFS picture will be identical but inverted.

An issue you have in Durham is v small numbers of non-White residents and people stopped, which will make the Black and Asian data more volatile/noisy.

'Black or Black British' (ditto Asian) is used to describe the wider grouping of Black ethnic identities, but Black British isn't offered as an option. That may mean that some people who would choose Black British choose Other Black instead.

Interestingly, the MPS workforce data includes Black British and Asian British options. Relatively large numbers in the former. www.met.police.uk/police-force...

My latest insights on stop and search. #7 is probably the most interesting.

My latest insights on stop and search. #7 is probably the most interesting.

What do the numbers of stops of Black people look like on a monthly basis? From the link above, 75 stops over 6 months is a tiny total.

Second, arrest v positive outcome rates.

12/

A couple of other charts, for the sake of completeness. First, positive outcome v S&S rates.

11/

I was thinking that in terms of the socio-economic status/class of those being stopped, S&S in Merseyside probably doesn't look v different to London (or Glasgow).

The implications of that include (1) SDE & EA can be used in combination to minimise gaps in ethnicity data (i.e. use EA to fill gaps in SDE); and (2) a wider Black grouping should include people with White/Black heritage in the Census denominator (ditto White/Asian for consistency).

Importantly, there is generally a high degree of alignment between SDE and officer-perceived ethnic appearance, especially for the main ethnic groups. Notably, at least 4/5 people who self-identify as White/Black mixed heritage are recorded as having a Black appearance.