Distorting of statistics
Posted: Thu May 13, 2010 9:31 am
Question 57520, for reference.
It seems odd to me that someone would stand behind such a blatant distortion of statistics. For those of you who don't want to read the article (and I recommend you do, as it is very insightful into the nature of local politics) I'll summarize. Essentially, Carl Wimmer is regurgitating a statistic originally cited by Chris Herrod (both Utah state legislators) which suggests that Hispanics are responsible for 81% of all homicides in Salt Lake City. How did he get this statistic? The BCI (Bureau of Criminal Identification) released statistics from the 2008 homicide arrests in Salt Lake City. The statistics were that of 18 homicide arrests, nine were of Hispanics, two were of non-Hispanics, and 7 were of individuals of "unknown ethnicity". These stats, already questionable to begin with, were further distorted by throwing out the 7 for whom ethnicity was cited as "unknown". Hence, 9 out of 11 becomes "81%".
Let's play the "how many flaws can we find with his method?" game.
1. 11 isn't really a statistically significant number. We're talking about a city of close to a million residents, and we want to find a trend based on 11 events?
2. This number isn't really relevant to a discussion about illegal immigration, since it says nothing about the individuals' legal status. The only argument that could be made based on these flawed numbers is to say that Hispanics are committing crimes, and we should kick them out. But even these men aren't out of touch enough to think that could possibly fly.
3. We threw out half of the significant data we had to begin with, which was already scant. The only conclusion we can come to when 7/18 aren't reported is that the data is worthless, and to throw it out. That's what any good statistician would do.
4. Homicide is one crime which is very statistically insignificant when it comes to overall crime rate, in this case. That is to say, homicides represent a very small amount of total crimes committed, statistically speaking. It is a specious argument to use stats from a relatively rare event and claim it signifies broader trends in all crime rates. Incidentally, the Sutherland institute, known for its care in its statistic tracking (unlike our representatives here) gave a much more useful indication of crime rates, namely, what percent of prison inmates are undocumented immigrants. They came up with around 5%, which is what many sources put as the percentage of undocumenteds of the population at large.
That's what I've got so far. Let's see if anyone can come up with more.
It saddens me that individuals will still go to such great lengths to vilify individuals based on their race. Perhaps what saddens me more is that there are individuals who will listen to them and use their votes to drive politics in that same direction, siting faulty statistics such as these in their bigotry.
It seems odd to me that someone would stand behind such a blatant distortion of statistics. For those of you who don't want to read the article (and I recommend you do, as it is very insightful into the nature of local politics) I'll summarize. Essentially, Carl Wimmer is regurgitating a statistic originally cited by Chris Herrod (both Utah state legislators) which suggests that Hispanics are responsible for 81% of all homicides in Salt Lake City. How did he get this statistic? The BCI (Bureau of Criminal Identification) released statistics from the 2008 homicide arrests in Salt Lake City. The statistics were that of 18 homicide arrests, nine were of Hispanics, two were of non-Hispanics, and 7 were of individuals of "unknown ethnicity". These stats, already questionable to begin with, were further distorted by throwing out the 7 for whom ethnicity was cited as "unknown". Hence, 9 out of 11 becomes "81%".
Let's play the "how many flaws can we find with his method?" game.
1. 11 isn't really a statistically significant number. We're talking about a city of close to a million residents, and we want to find a trend based on 11 events?
2. This number isn't really relevant to a discussion about illegal immigration, since it says nothing about the individuals' legal status. The only argument that could be made based on these flawed numbers is to say that Hispanics are committing crimes, and we should kick them out. But even these men aren't out of touch enough to think that could possibly fly.
3. We threw out half of the significant data we had to begin with, which was already scant. The only conclusion we can come to when 7/18 aren't reported is that the data is worthless, and to throw it out. That's what any good statistician would do.
4. Homicide is one crime which is very statistically insignificant when it comes to overall crime rate, in this case. That is to say, homicides represent a very small amount of total crimes committed, statistically speaking. It is a specious argument to use stats from a relatively rare event and claim it signifies broader trends in all crime rates. Incidentally, the Sutherland institute, known for its care in its statistic tracking (unlike our representatives here) gave a much more useful indication of crime rates, namely, what percent of prison inmates are undocumented immigrants. They came up with around 5%, which is what many sources put as the percentage of undocumenteds of the population at large.
That's what I've got so far. Let's see if anyone can come up with more.
It saddens me that individuals will still go to such great lengths to vilify individuals based on their race. Perhaps what saddens me more is that there are individuals who will listen to them and use their votes to drive politics in that same direction, siting faulty statistics such as these in their bigotry.