Average SD family 2000 vs 2010

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[quote=AN]CONCHO, I agree that median and average have their flaws. However, if you think it’s nearly worthless, then do you have a suggestion of something better that allow us to do our own data mining including historical data? I take median and average data over anecdotal any day of the week. Or, are you saying since median, average, and anecdotal are all nearly worthless, so there’s no point in discussing about it?[/quote]

Yeah, you can’t make any assumptions based on mean. For example, here are two populations:

Population A: 100,000 people earning between 25,000 and 75,000 a year, with a perfect normal distribution. Mean income 50,000.

Population B: 100,000 people, 99,000 of whom earn 10,000 a year and 1,000 who earn 10,000,000 a year.

Population A has a single-mode income distribution, population B has a dual-mode income distribution. Population B has a much higher standard deviation of income than population A.

Gross income of Population A: 5,000,000,000
Gross income of Population B: 10,990,000,000

Average income of Population A: 50,000/year
Average income of Population B: 109,900/year

Looking at only average and gross income, it appears that population B is much more prosperous than population A. Which would you rather live in? Based on average income, you’d choose population B of course. However if you knew that population B had an extreme bimodal income distribution, you’d pick population A. Perhaps this is why our media and government love to tell us averages but never provide standard deviation.

Standard deviation is so handy because it is a single number that gives us an instant insight into the type of distribution we’re looking at. It doesn’t require the reader to parse a huge table of figures or mounds of data; instead it is a clever distillation that is almost as easy to calculate as the average. There’s really no reason not to include it in a statistical study other than ignorance or deliberate obfuscation in order to mislead the reader.

In the absence of data about the underlying distribution, it is preferable not to make any assumptions about the data since you are likely to be wrong.

As Spock would say, “Insufficient data, captain.”

[jstoesz]

The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…

[jstoesz]

The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…

[jstoesz]

The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…

[jstoesz]

The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…

[jstoesz]

The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…

[bearishgurl]

[quote=walterwhite]I think I’m gonna go buy some powdered milk. See if my kids notice.[/quote]

scaredy, I drank powdered milk as a kid. Here’s how to make it taste better. Make it up in a blender or something you can shake it in. Use room temperature water (not cold). Use slightly more powder to make the “richer” milk. Blend or shake really, really well. Refrigerate for at least 3 hrs in cold frig (set at 3-4). Wa-laa, you have “milk” for less than half the price (if you purchase it in bulk and not the expensive pre-measured packets).

In island nations, where there are no dairy animals and thus no dairy products that are not flown in (i.e. VERY expensive), the population subsists off dry milk powder. It is reconstituted and sold this way in cold cartons on-island or sold in vacuum-packed boxes (whole milk) or dry (lowfat/nonfat).

There’s nothing wrong with it. You just have to get used to the taste.

[bearishgurl]

[quote=walterwhite]I think I’m gonna go buy some powdered milk. See if my kids notice.[/quote]

scaredy, I drank powdered milk as a kid. Here’s how to make it taste better. Make it up in a blender or something you can shake it in. Use room temperature water (not cold). Use slightly more powder to make the “richer” milk. Blend or shake really, really well. Refrigerate for at least 3 hrs in cold frig (set at 3-4). Wa-laa, you have “milk” for less than half the price (if you purchase it in bulk and not the expensive pre-measured packets).

In island nations, where there are no dairy animals and thus no dairy products that are not flown in (i.e. VERY expensive), the population subsists off dry milk powder. It is reconstituted and sold this way in cold cartons on-island or sold in vacuum-packed boxes (whole milk) or dry (lowfat/nonfat).

There’s nothing wrong with it. You just have to get used to the taste.

[bearishgurl]

[quote=walterwhite]I think I’m gonna go buy some powdered milk. See if my kids notice.[/quote]

scaredy, I drank powdered milk as a kid. Here’s how to make it taste better. Make it up in a blender or something you can shake it in. Use room temperature water (not cold). Use slightly more powder to make the “richer” milk. Blend or shake really, really well. Refrigerate for at least 3 hrs in cold frig (set at 3-4). Wa-laa, you have “milk” for less than half the price (if you purchase it in bulk and not the expensive pre-measured packets).

In island nations, where there are no dairy animals and thus no dairy products that are not flown in (i.e. VERY expensive), the population subsists off dry milk powder. It is reconstituted and sold this way in cold cartons on-island or sold in vacuum-packed boxes (whole milk) or dry (lowfat/nonfat).

There’s nothing wrong with it. You just have to get used to the taste.

[bearishgurl]

[quote=walterwhite]I think I’m gonna go buy some powdered milk. See if my kids notice.[/quote]

scaredy, I drank powdered milk as a kid. Here’s how to make it taste better. Make it up in a blender or something you can shake it in. Use room temperature water (not cold). Use slightly more powder to make the “richer” milk. Blend or shake really, really well. Refrigerate for at least 3 hrs in cold frig (set at 3-4). Wa-laa, you have “milk” for less than half the price (if you purchase it in bulk and not the expensive pre-measured packets).

In island nations, where there are no dairy animals and thus no dairy products that are not flown in (i.e. VERY expensive), the population subsists off dry milk powder. It is reconstituted and sold this way in cold cartons on-island or sold in vacuum-packed boxes (whole milk) or dry (lowfat/nonfat).

There’s nothing wrong with it. You just have to get used to the taste.

[bearishgurl]

[quote=walterwhite]I think I’m gonna go buy some powdered milk. See if my kids notice.[/quote]

scaredy, I drank powdered milk as a kid. Here’s how to make it taste better. Make it up in a blender or something you can shake it in. Use room temperature water (not cold). Use slightly more powder to make the “richer” milk. Blend or shake really, really well. Refrigerate for at least 3 hrs in cold frig (set at 3-4). Wa-laa, you have “milk” for less than half the price (if you purchase it in bulk and not the expensive pre-measured packets).

In island nations, where there are no dairy animals and thus no dairy products that are not flown in (i.e. VERY expensive), the population subsists off dry milk powder. It is reconstituted and sold this way in cold cartons on-island or sold in vacuum-packed boxes (whole milk) or dry (lowfat/nonfat).

There’s nothing wrong with it. You just have to get used to the taste.

[blahblahblah]

[quote=jstoesz]The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…[/quote]

Yeah good point, I missed that the original post showed median numbers. However I’ll bet we could come up with some data sets in which even that would be misleading. But at least median does give you some idea about the distribution, you know that half of the samples are less and half are higher.

[blahblahblah]

[quote=jstoesz]The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…[/quote]

Yeah good point, I missed that the original post showed median numbers. However I’ll bet we could come up with some data sets in which even that would be misleading. But at least median does give you some idea about the distribution, you know that half of the samples are less and half are higher.

[blahblahblah]

[quote=jstoesz]The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…[/quote]

Yeah good point, I missed that the original post showed median numbers. However I’ll bet we could come up with some data sets in which even that would be misleading. But at least median does give you some idea about the distribution, you know that half of the samples are less and half are higher.

[blahblahblah]

[quote=jstoesz]The median, something that is often reported is a little closer to the truth, no?

Population A has a median of 50k.

Population B has a median of 10k.

At least that is how I understand mean vs median. Median is the value of the middle number in a set of data, mean is simply the average.

The problem I often see with median data sets is the mix so often changes or is not representative of the real…[/quote]

Yeah good point, I missed that the original post showed median numbers. However I’ll bet we could come up with some data sets in which even that would be misleading. But at least median does give you some idea about the distribution, you know that half of the samples are less and half are higher.

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