Astral Codex Ten

NCVS

18 min read

NCVS

Article

NCVS is a recurring organization in the Astral Codex Ten archive, appearing 2 times across 2 issues between February 18, 2026 and February 19, 2026. The archive places it in contexts such as “you can use NCVS and police reports to calculate reporting rates directly”; “We need an equivalent of the NCVS - reports coming from the victims themselves”. It most often appears alongside Black Lives Matter, FBI, San Francisco.

Metadata

  • Category: Organizations
  • Mention count: 2
  • Issue count: 2
  • First seen: February 18, 2026
  • Last seen: February 19, 2026

Appears In

None.

Source Context

Recovered passages from the original issue text. When the raw archive preserved outbound links inside the source passage, they are listed directly under the quote.

Record Low Crime Rates Are Real, Not Just Reporting Bias Or Improved Medical Care
February 18, 2026 · Original source
The 1960-2023 data come from FBI Data Explorer via Vital City; the 2024 and 2025 data come directly from the FBI website, with 2025 annualized via incomplete Jan - Oct data. This one may or may not be an all-time low, but it’s pretty good. These data are counterintuitive. Are they wrong? Could This Be An Artifact Of Reporting Bias? People could be so inured to crime that they stop reporting it to the police. Or the police could be so overwhelmed that they stop accepting the reports. Since most crime statistics are based on police reports, this would look like crime going down. There’s some evidence of this happening in specific situations, like shoplifting in San Francisco. Could it be the whole effect? No, for three reasons. The National Crime Victimization Survey is a government-run survey of a 240,000 person nationally representative sample. They find random people and ask whether they were the victims of crimes in the past year. This obviously doesn’t work for murder, but they keep statistics on rape, assault, larceny, and burglary. Their numbers mostly mirror those reported by police and used in the usual statistics about crime rates. But here there’s no extra step of needing to trust the police enough to make a report: the surveyors ask the victims directly. Although there could be biases in this methodology too, it would be an extraordinary coincidence if they exactly matched the proposed reporting bias to police. Also, you can use NCVS and police reports to calculate reporting rates directly. Overall, they seem to have increased over time - did you know that the 9-1-1 emergency hotline wasn’t available in most areas until the 1970s? This is especially true for aggravated assault (which will become important later). (source: Baumer and Lauritsen) There’s one caveat - FBI statistics show that crime had a small local peak in 2020/2021, then fell in 2023 - 2025. The most recent NCVS survey, in 2024, shows a smaller fall, leaving us still above 2019 lows. There’s some debate over whether the FBI vs. NCVS numbers are better for the 2022 - 2025 period, but they don’t change the overall trajectory or the fact that we’re at least close to record lows. Murder is almost always reported to and investigated by police; there’s a person who should be alive but isn’t, and people inevitably notice and care about this. Therefore, reported murder rates should be accurate. But murder has decreased at about the same rate as every other crime. Therefore, we should believe that other crimes have gone down too (for the objection that murder statistics are unusually untrustworthy because of improving medical care, see below). And car theft is consistently reported to the police, because insurances require a police report before they will compensate the lost car. So even if the victim doesn’t trust the police to do a good job investigating, they report it anyway. But car theft rates have declined at similar rates to other crimes. This is further evidence that the decline can’t be explained by poor reporting. Could This Be An Artifact Of Improving Medical Care? Good medical care can help victims survive, transforming murders into attempted murders or aggravated assaults (after this: “AM/AA”). If the same gunshot is only half as likely to kill someone today as it would have been in 1960, then a seemingly-equivalent murder rate would correspond to twice as many people getting shot. Could this explain the apparent decline in murders? The argument would go something like: murder is the only crime that we’re completely sure gets reported consistently. But the murder rate is artificially depressed by improving medical care. Therefore, maybe the seemingly-low murder rate is because of the medical care, the seemingly-low rates of other crimes are because of reporting bias, and actually crime is up. We’ve already seen that several parts of this can’t be true: other crimes like car theft are reported consistently, and among the inconsistently reported ones, reports are more often increasing than decreasing. But the part about murder also fails on its own terms. The source for the claim that improving medical care lowers murder rates is Harris et al, which analyzed crime from 1960 - 1999 and concluded that “the principal explanation of the downward trend in lethality involves parallel developments in medical technology”. They found that aggravated assaults rose faster than murders during this time; AAs increased by 5x, while murders “merely” doubled. Under the reasonable assumption that these crimes have similar generators, they suggested that the cause was improved medical care saving the lives of those who would have otherwise died, converting potential murders into AAs. If murders rose at the same rate as AAs, then the true murder rate could be up to 3x higher than reported. Source: FBI UCR But more recent research, especially Eckberg (2014), challenges this story. Eckberg argued the AA vs. murder divergence was caused by two things: first, better reporting of aggravated assault (as discussed above), and second, police being more likely to classify borderline causes as aggravated assault rather than regular assault. He turned to the National Crime Victimization Survey, which escapes reporting bias and police classification flexibility. In these data, AAs and murder rose at about the same rate. He concluded that (my emphasis): Their lethality trend is not compatible with the previous finding [of declining lethality] across 1973 through 1999, remaining stable rather than falling. After 1999, both Uniform Crime Reports (UCR)-and NCVS-based measures indicate increases in lethality. How is this possible, since medical technology has certainly improved? It seems that gun injuries are getting worse over time. Livingstone et al studied changing characteristics of gunshot victims between 2000 and 2011. They found that the proportion of patients with 3+ wounds almost doubled (13% → 22%) during that period (p < 0.0001). Manley et al did a similar study looking at 1996 - 2016 and found a similar result, saying that “wounding in multiple body regions suggests more effective weaponry, including increased magazine size”. A letter by top trauma doctors to the American Journal of Public Health describes: …increases in gunshot injuries per patient, gunshot injuries to critical regions (head, spine, chest), and gunshot injuries to multiple regions. Injury Severity Scores were also higher over similar intervals correlating with lower probability of survival. Despite which …patients surviving evaluation in the emergency department had no significant increase in mortality. Major strides in trauma care have occurred over the last two decades, and nationwide organizational changes have expanded the delivery of these improvements. Sakran et al, studying the 2007 - 2014 period, have an especially vivid portrayal of this pattern: Likelihood of dying before hospitalization - primarily dependent on injury severity - went up. Likelihood of dying in the hospital went down, probably because trauma care improved (although this could also be because more of the sickest patients died before entering the hospital). Cook et al studied gunshot lethality during a slightly different period - 2003 - 2012 - and also found that it stayed the same overall. There are three plausible explanations for gun injuries getting worse over time: Improved weapons technology (e.g. switch to semi-automatics)
Inline links: Vital City, shoplifting in San Francisco, is, https://substackcdn.com/image/fetch/$s_!43la!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F7726a00f-8995-4c88-bd7a-62d9a894279c_610x438.png, source, some debate, consistently reported, have declined, Harris et al, https://substackcdn.com/image/fetch/$s_!8FyR!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fa1aa5677-aac7-472f-9c52-7bf0568043bf_583x316.png, Eckberg (2014), Livingstone et al, Manley et al, A letter by top trauma doctors, Sakran et al, https://substackcdn.com/image/fetch/$s_!RCq3!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F2de4bd61-baf8-4226-ae8f-c0a5a29f109d_1280x990.png, Cook et al
Source: FBI UCR But more recent research, especially Eckberg (2014), challenges this story. Eckberg argued the AA vs. murder divergence was caused by two things: first, better reporting of aggravated assault (as discussed above), and second, police being more likely to classify borderline causes as aggravated assault rather than regular assault. He turned to the National Crime Victimization Survey, which escapes reporting bias and police classification flexibility. In these data, AAs and murder rose at about the same rate. He concluded that (my emphasis): Their lethality trend is not compatible with the previous finding [of declining lethality] across 1973 through 1999, remaining stable rather than falling. After 1999, both Uniform Crime Reports (UCR)-and NCVS-based measures indicate increases in lethality. How is this possible, since medical technology has certainly improved? It seems that gun injuries are getting worse over time. Livingstone et al studied changing characteristics of gunshot victims between 2000 and 2011. They found that the proportion of patients with 3+ wounds almost doubled (13% → 22%) during that period (p < 0.0001). Manley et al did a similar study looking at 1996 - 2016 and found a similar result, saying that “wounding in multiple body regions suggests more effective weaponry, including increased magazine size”. A letter by top trauma doctors to the American Journal of Public Health describes: …increases in gunshot injuries per patient, gunshot injuries to critical regions (head, spine, chest), and gunshot injuries to multiple regions. Injury Severity Scores were also higher over similar intervals correlating with lower probability of survival. Despite which …patients surviving evaluation in the emergency department had no significant increase in mortality. Major strides in trauma care have occurred over the last two decades, and nationwide organizational changes have expanded the delivery of these improvements. Sakran et al, studying the 2007 - 2014 period, have an especially vivid portrayal of this pattern: Likelihood of dying before hospitalization - primarily dependent on injury severity - went up. Likelihood of dying in the hospital went down, probably because trauma care improved (although this could also be because more of the sickest patients died before entering the hospital). Cook et al studied gunshot lethality during a slightly different period - 2003 - 2012 - and also found that it stayed the same overall. There are three plausible explanations for gun injuries getting worse over time: Improved weapons technology (e.g. switch to semi-automatics)
Inline links: Eckberg (2014), Livingstone et al, Manley et al, A letter by top trauma doctors, Sakran et al, https://substackcdn.com/image/fetch/$s_!RCq3!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F2de4bd61-baf8-4226-ae8f-c0a5a29f109d_1280x990.png, Cook et al
(source: Baumer and Lauritsen) There’s one caveat - FBI statistics show that crime had a small local peak in 2020/2021, then fell in 2023 - 2025. The most recent NCVS survey, in 2024, shows a smaller fall, leaving us still above 2019 lows. There’s some debate over whether the FBI vs. NCVS numbers are better for the 2022 - 2025 period, but they don’t change the overall trajectory or the fact that we’re at least close to record lows. Murder is almost always reported to and investigated by police; there’s a person who should be alive but isn’t, and people inevitably notice and care about this. Therefore, reported murder rates should be accurate. But murder has decreased at about the same rate as every other crime. Therefore, we should believe that other crimes have gone down too (for the objection that murder statistics are unusually untrustworthy because of improving medical care, see below). And car theft is consistently reported to the police, because insurances require a police report before they will compensate the lost car. So even if the victim doesn’t trust the police to do a good job investigating, they report it anyway. But car theft rates have declined at similar rates to other crimes. This is further evidence that the decline can’t be explained by poor reporting. Could This Be An Artifact Of Improving Medical Care? Good medical care can help victims survive, transforming murders into attempted murders or aggravated assaults (after this: “AM/AA”). If the same gunshot is only half as likely to kill someone today as it would have been in 1960, then a seemingly-equivalent murder rate would correspond to twice as many people getting shot. Could this explain the apparent decline in murders? The argument would go something like: murder is the only crime that we’re completely sure gets reported consistently. But the murder rate is artificially depressed by improving medical care. Therefore, maybe the seemingly-low murder rate is because of the medical care, the seemingly-low rates of other crimes are because of reporting bias, and actually crime is up. We’ve already seen that several parts of this can’t be true: other crimes like car theft are reported consistently, and among the inconsistently reported ones, reports are more often increasing than decreasing. But the part about murder also fails on its own terms. The source for the claim that improving medical care lowers murder rates is Harris et al, which analyzed crime from 1960 - 1999 and concluded that “the principal explanation of the downward trend in lethality involves parallel developments in medical technology”. They found that aggravated assaults rose faster than murders during this time; AAs increased by 5x, while murders “merely” doubled. Under the reasonable assumption that these crimes have similar generators, they suggested that the cause was improved medical care saving the lives of those who would have otherwise died, converting potential murders into AAs. If murders rose at the same rate as AAs, then the true murder rate could be up to 3x higher than reported. Source: FBI UCR But more recent research, especially Eckberg (2014), challenges this story. Eckberg argued the AA vs. murder divergence was caused by two things: first, better reporting of aggravated assault (as discussed above), and second, police being more likely to classify borderline causes as aggravated assault rather than regular assault. He turned to the National Crime Victimization Survey, which escapes reporting bias and police classification flexibility. In these data, AAs and murder rose at about the same rate. He concluded that (my emphasis): Their lethality trend is not compatible with the previous finding [of declining lethality] across 1973 through 1999, remaining stable rather than falling. After 1999, both Uniform Crime Reports (UCR)-and NCVS-based measures indicate increases in lethality. How is this possible, since medical technology has certainly improved? It seems that gun injuries are getting worse over time. Livingstone et al studied changing characteristics of gunshot victims between 2000 and 2011. They found that the proportion of patients with 3+ wounds almost doubled (13% → 22%) during that period (p < 0.0001). Manley et al did a similar study looking at 1996 - 2016 and found a similar result, saying that “wounding in multiple body regions suggests more effective weaponry, including increased magazine size”. A letter by top trauma doctors to the American Journal of Public Health describes: …increases in gunshot injuries per patient, gunshot injuries to critical regions (head, spine, chest), and gunshot injuries to multiple regions. Injury Severity Scores were also higher over similar intervals correlating with lower probability of survival. Despite which …patients surviving evaluation in the emergency department had no significant increase in mortality. Major strides in trauma care have occurred over the last two decades, and nationwide organizational changes have expanded the delivery of these improvements. Sakran et al, studying the 2007 - 2014 period, have an especially vivid portrayal of this pattern: Likelihood of dying before hospitalization - primarily dependent on injury severity - went up. Likelihood of dying in the hospital went down, probably because trauma care improved (although this could also be because more of the sickest patients died before entering the hospital). Cook et al studied gunshot lethality during a slightly different period - 2003 - 2012 - and also found that it stayed the same overall. There are three plausible explanations for gun injuries getting worse over time: Improved weapons technology (e.g. switch to semi-automatics)
Inline links: source, some debate, consistently reported, have declined, Harris et al, https://substackcdn.com/image/fetch/$s_!8FyR!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fa1aa5677-aac7-472f-9c52-7bf0568043bf_583x316.png, Eckberg (2014), Livingstone et al, Manley et al, A letter by top trauma doctors, Sakran et al, https://substackcdn.com/image/fetch/$s_!RCq3!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F2de4bd61-baf8-4226-ae8f-c0a5a29f109d_1280x990.png, Cook et al
Crime As Proxy For Disorder
February 19, 2026 · Original source
At least in these data, it’s - if anything - less. Okay, so could stores be failing to report to police? Some stores say they’re doing this, and there was an embarrassing incident - it might be the 2021 spike on the graph above - where two stores briefly changed their reporting policy and nearly doubled the total report number. We need an equivalent of the NCVS - reports coming from the victims themselves. Our best bet is the National Retail Survey, from a retail organization which asks stores what percent of their inventory they believe they lose to various causes, including shoplifting. Only about a 20% increase during the 2004 - 2022 period. The NRS is sponsored by a retail trade industry group which really wants to find shoplifting so they can lobby for better anti-shoplifting measures. In 2024 they were so embarrassed by their failure to do so that they stopped the survey entirely and sold the survey brand to an anti-shoplifting security tech company (no bias there!). The company replaced it with a survey of vibes among store owners, and dutifully reported that the vibes about shoplifting had never been worse and you needed to buy their product right away. Now what? The survey doesn’t disaggregate by city, so maybe national shoplifting is stable, but San Francisco really is worse, and just isn’t reporting it to the police? Might this be because there are fewer stores (everyone is buying through Amazon) and therefore even if all existing stores are crammed with shoplifters all the time, it shows up as less shoplifting? This isn’t trivially true - the number of stores has declined less than I would expect, maybe not at all - but there’s been a shift in types of stores (from big box to local). If these types have different shoplifting or reporting patterns, that might matter. Otherwise, we’re in the awkward position where everyone (including stores) reports higher shoplifting numbers, but two datasets both disagree. Homelessness and Tent Encampments: Here’s a graph of homelessness, courtesy of Claude: I’ve confirmed the post 2009 trend; I haven’t fully double-checked the others but they match my impressions. This looks like a similar pattern to crime, although here the likely explanation for the COVID bump is the pandemic-associated rise in house prices. Good measures of tent encampments over long periods are hard to find. San Francisco has this one: …but it starts in 2019, peaks during the pandemic, and then declines. This can’t really show whether 2019 was already higher than some previous year. Here is an interesting graph of Seattle homeless sweeps, ie number of times the police acted against encampments: …but it doesn’t tell us whether encampments are increasing, or the police are taking them more seriously. It does rule out a story where encampments are increasing because the police are no longer taking action - aside from the pandemic, police are taking more action than ever, at least as measured here. People With Loud Boom Boxes In Public Places: All I have to say about this one is that it’s terrible and I hate it. Overall, it’s surprisingly hard to find data confirming that disorder has increased: Littering seems to be down
Inline links: https://substackcdn.com/image/fetch/$s_!TR_v!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F873506d8-b99a-43fa-845b-ab02527c7ece_818x444.png, stopped the survey entirely and sold the survey brand to an anti-shoplifting security tech company, https://substackcdn.com/image/fetch/$s_!t2K8!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F05ae2100-6afc-44b2-b334-15132ac3cb29_906x887.png, the pandemic-associated rise in house prices, has, https://substackcdn.com/image/fetch/$s_!IP1D!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F3dcf3fdb-3af0-4c26-b2c9-0525d4ab4800_807x615.png, Here, https://substackcdn.com/image/fetch/$s_!tv-7!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F3458f2f2-becc-4a5b-bb89-3644d599d9d2_960x540.png