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Non-linear least squares regression was initially used to fit some distributions of log2-transformed data to a range of symmetrical ¡®bell-shaped¡¯ theoretical population distributions. This technique was also applied to theoretical cumulative distributions of the same data. Regression was conducted in Systat software v.10.2 (Systat, Richmond, CA, USA). Nonlinear least squares regression was then employed to fit cumulative log2-transformed distributions to the normal cumulative function (ZCF). Three parameters were estimated, the mean and standard deviation (both log2), and the total number (N) in the presumed unimodal distribution. N was estimated rather than taken as a constant in the regression, because of the desire to fit the data to the distribution without assuming that N truly contained only wild-type isolates. ÎÒ×î½üÒª×öһЩÊý¾ÝµÄ·ÇÏßÐÔÄ£Ä⣬µÃµ½ÕâЩÊý¾ÝËùÄ£ÄâµÄÇúÏßÖÐÔ¤²âÖµÓëʵ¼ÊÖµµÄ²îÒ죬²Î¿¼ÁËÉÏÃæÎÄÏ×Öеķ½·¨£¬Systat software ÎÒÒ²ÓУ¬µ«ÊÇÒòΪÒÔǰûÓùý£¬²»ÖªµÀÔõôÊäÈëÊý¾Ý¼°Ñ¡ÔñÏàÓ¦µÄ¹«Ê½½øÐÐÄ£Ä⣬×Ô¼ºÊÔÁ˺ÃЩ´ÎҲû³É¹¦£¬Ï£Íû¸ßÈ˸øÓèÖ¸µã£¡Íò·Ö¸Ðл£¡¸½¼þÖÐÓÐÏà¹Ø²Î¿¼ÎÄÏ×ÖеķÇÏßÐÔ·ÖÎö·½·¨£¬Çë²Î¿¼£¡ |
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