Why do we study trend ?
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Because History Repeats inself and it helps us predict the future.
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It doesn't.  It is important to study the past so we can learn from the collective experience of the human race.  That way we can avoid repeating mistakes, and try to repeat sucessful choices.
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Internet Services  and consumer/market trends
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Gaining new understanding about why things work.
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variation. variation is every where. statistics is also important in business, nursing, ect. it gives you the tools to analyze the data collected and to know what the variation is telling you. there is a book called lady tasting tea and gives you info on the great statistician of the 20th century and the influence they had on the world. easy read story format.
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I've already thought about it, and I think the answer is no.\n\nThe most near from social sciences applications is in economics\nwhere chaos theory is useful to measure and estimate movements of economic indicators or values, in short periods of time (as stocks or things like that).\nIn biology, they're using chaos theory for modelling evolution, and in artificial intelligence, it's also useful, but i have never heard about of an application in social science.\n\nWait!  I looked and I found something in Epidemiology!! \nokey, here's the link:\n\nwww.ulg.ac.be/mathgen/CHAOS/\nIJCAS/IJCAS_1_PS_PG_DD.pdf\n\nIt's kind of technical, be sure to have review something about fractals and autosimiliraty before take a look on it.
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Trend sometimes means the same as fashion but it is also like "following the trend" as in wearing the latest styles, or fashions. They are both pretty much the same.
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Statistics studies, among other things, deviations from normals and can help to explain errors (as well as help explain how errors are propagated and where their sources can be).\n\nFor example, if you have a numerical amount with an error and you multiply that value by something known and constant (like conversion from USD to Euros, for example), that error will be multiplied by that conversion rate.\n\nStatistics uses error calculation such as standard deviation (how much a value can vary from the average amount) and goes very far into detail about sums of errors etc. and how they affect averages, errors, and final values.\n\nAdditinoally, there are some formulae that are used all throughout the sciences that can be applied to accounting, and those sciences use statistics, again, to calculate errors.  For example, growth and decay of a radioactive substance has a certain formula that uses exponential (e to the power of something), but this is also used to calculate economic growth rates and can be applied to the stock market (it can also be used to explain traffic jams and other civil engineering problems).
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modern algebra is used in all scientific fields on almost a daily basis.  Its used everyday by the financial world in calculating interest and money values.  its used by the social sciences to study trends with society. A cashier at a store uses it when she rings up your order (the machine does it for them in most cases) Its basically used by everyone, everyday.
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I would not think it was ..considering "ratios"are \nsupposedly exact concept pertaining to mathamatical\ncalculations."I would be offended if it was ,because to\ntell you the truth I am not so great at certain \nmathmatical equations off the top of my head. I have to completely immerse myself or it would fade away.But \nanyways I suppose if it were that it would be useful in \nsome ways.That would be like a "gift"to understand \nshort demands of supply ,but then again it's only a trend.\nBut if you mean a graph with a meter ,or pole as the ratio\nthen I guess it would overall come in handy toward estimating the demand ,which would also define this \nparticuliar "trend" because need does not...define "trend"\nUnless your addicted or something.
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There is evidence in that we [humans] continue to evolve and change our environment.  Logic says there can be no growth without change- and no change without new ideas and perspectives.
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The purpose for us to study history is to learn from past mistakes and understand how our world came to be what it is. However, its funny to see that the thing we learn from history is that we don't learn at all. History will always repeat itself. However, the repitition won't be exact and sometimes not as severe. Looking at our situation,  its more than likely that we'll relive some aspects of history, and depending on the situation, the outcome may or may not be positive.
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I'm in a economics class too, and they are things that are used to predict if the economy is going into a period of contraction or growth. Some examples are the stock market, the real GDP, prices, and sales.
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It is the good way of sharing knowledge,it helps in update knowledge, by yahoo answers people understand way of public thinking and their trend,it helping understanding peoples life style.some may some miss guide by some one answers.
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All studies are done with an agenda, to discover or investigate something.  If results are skewed they often don't hold any water in the scientific community or won't make major press.  One study isn't worth anything, but a history of repeated studies that replicate the same findings are what are held as valuable.  There's a lot of factors and you have to approach each on a case by case value.
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You might be looking for Regression analysis.\nThis is the statistical technique used to look for correlations between variables.
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You can compare current amino acid sequences to old sequences and visualize the difference.  You can also produce both sequences in culture, produce the protein and see what their functions are and how they have changed.  Then you can hypothesize when and why.