Data expansion:
1, property
Information is the elimination of some sexual knowledge. For example, the uncertainty of the news "It will rain tomorrow" tonight is 50%, but if it rains the next day, the uncertainty of "It will rain" is 0, which means that the elimination of uncertainty is equal to 50%. So the information content of the news "It will rain tomorrow" is 50%.
Although the information is uncertain, there are ways to quantify it. According to the concept of information, people can conclude that information has the following characteristics:
The greater the probability P(x) of message appearance, the smaller the amount of information; Conversely, the smaller the probability of occurrence, the greater the amount of information. As you can see, the amount of information (which we refer to as I) is inversely proportional to the probability of message occurrence.
When the probability is 1, everyone in the world knows what happened, so the amount of information is 0.
When a message consists of several independent small messages, the information contained in this message should be equal to the sum of the information contained in each small message.
The so-called information quantity refers to the information measure or content needed to select an event from n equal possible events, that is, the minimum number of times to ask "yes or no" in the process of identifying a specific event among n events.
3. What is news?
News is a common news genre. It conveys and reports the recent important events in real life in a timely, rapid and accurate manner with concise and clear words. It is usually used by newspapers, radio, television and some enterprises and institutions to convey information and reflect the situation.
4. Classification of messages
According to the writing characteristics, news can be divided into: dynamic news, comprehensive news, experience news and comment news;
News can be divided into political news, economic news, cultural and educational news, sports news and social news.
From the object of reflection, news can be divided into: people news and event news;
Spatially speaking, messages can be divided into long messages and short messages;
According to the writing characteristics, news can be divided into dynamic news, experience news, comprehensive news and concise news.