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zaq123321
ר¼Ò¹ËÎÊ (ÖøÃûдÊÖ)
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ר¼Ò¾Ñé: +342 - ÊýѧEPI: 6
- Ó¦Öú: 298 (´óѧÉú)
- ¹ó±ö: 0.247
- ½ð±Ò: 11336.3
- ºì»¨: 29
- Ìû×Ó: 1221
- ÔÚÏß: 538.8Сʱ
- ³æºÅ: 405284
- ×¢²á: 2007-06-17
- ÐÔ±ð: MM
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YANGZL: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл½âÊÍ 2015-06-09 22:44:29
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YANGZL: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл½âÊÍ 2015-06-09 22:44:29
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Mathematical expectation is used in probability. Mean value is used in statistics. The weight of the expectation is probability but mean value uses frequency or percentage as weight. They are different in theory and are not exchangeable. [ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ] |

2Â¥2015-06-09 20:14:58
junefi
Ìú¸Ëľ³æ (ÕýʽдÊÖ)
- ÊýѧEPI: 1
- Ó¦Öú: 49 (СѧÉú)
- ½ð±Ò: 6789.3
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- Ìû×Ó: 824
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YANGZL: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл£¡Ñ§Ï°ºóÔÙÏòÄúÌáÎÊ¡£ 2015-06-09 22:44:54
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YANGZL: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл£¡Ñ§Ï°ºóÔÙÏòÄúÌáÎÊ¡£ 2015-06-09 22:44:54
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In probability and statistics, mean and expected value are used synonymously to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution. --Wikipedia The expected value is also known as the expectation, mathematical expectation, EV, mean, or first moment. --Wikipedia ËùÒÔmean, mathematical expectation, expected valueµÈÊÇ¿ÉÒÔ»¥»»µÄ£¬µ«ÔÚͬһƪÂÛÎÄÖÐÓ¦¸Ãͳһ¡£¶øÇÒÎÒÃÇ¿ØÖÆ¿ÆÑ§ÔÚÂÛÎÄÖС°mean¡±ÓÃµÄ±È½ÏÆÕ±é¡£ ÎÒÃÇÒ»°ã²»Ëµ¡°mean value¡±±íʾ¾ùÖµ£¬ÒòΪÓÐ mean value theorem£¨ÖÐÖµ¶¨Àí/ÖмäÖµ¶¨Àí/ƽ¾ùÖµ¶¨Àí£©¡£ In mathematics and statistics, average would be called the arithmetic mean. -- Wikipedia ¡°average¡±Ö»ÊÇarithmetic mean£¬ÓëmeanÓв»Í¬. ¡°mean error¡±Ó÷¨Ò²ÐíÓ¦¸ÃҪעÒâ¡£ÓÐmean square error£¬ÓÐmean absolute error£¬µ«mean errorÎÒÊÇÕÒ²»µ½Ïà¹Ø¸ÅÄî¡£Îó²îµÄƽ¾ù£¿Ö±½Ó°ÑÎó²î²»¾¹ý´¦ÀíÆ½¾ùÎÒ¾õµÃÊÇ¡°²»¿ÆÑ§¡±µÄ¡£ |

3Â¥2015-06-09 20:44:46
zaq123321
ר¼Ò¹ËÎÊ (ÖøÃûдÊÖ)
-

ר¼Ò¾Ñé: +342 - ÊýѧEPI: 6
- Ó¦Öú: 298 (´óѧÉú)
- ¹ó±ö: 0.247
- ½ð±Ò: 11336.3
- ºì»¨: 29
- Ìû×Ó: 1221
- ÔÚÏß: 538.8Сʱ
- ³æºÅ: 405284
- ×¢²á: 2007-06-17
- ÐÔ±ð: MM
- רҵ: ÉúÎï´ó·Ö×ӽṹÓ빦ÄÜ
- ¹ÜϽ: Êýѧ
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
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Average value is the same as mean value. But what's mean error is not clear. You may append their definitions when you use them. [ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ] |

4Â¥2015-06-09 21:02:14













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