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smilesir

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Éó¸åÈËÒâ¼ûÈçÏ£ºThe description of statistical analyses is unclear. It needs to be thoroughly rephrased. What is the reason of using both SPSS and SAS programs? Animal model is not implemented in SPSS or SAS programs unless not mentioned author libraries or functions have been used.
Have association analyses been carried out on direct additive breeding values?

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Statistical analysis
Statistical analysis of associations between genotypes and the selected traits of F2 chickens were carried out using SPSS 19.0 according to the following linear mixed model:
Yijklm=¦Ì+Gi+Sj+Hk+fl +eijklm
Where, Yijklm is the dependent variable (analyzed traits); ¦Ì is the overall mean; Gi is the fixed effect of genotype or haplotype; Sj is the fixed effect of sex; Hk is the fixed effect of hatch, fl is the random effect of family, eijklm is the random error.
The SNP-traits association analysis was done in two steps. First, we used the full animal model which included fixed effects of marker genotype, sex, hatch and a random effect of family. Second, on the basis of the first step, we used the reduced animal model in order to exclude the effects that did not have a significant influence (p>0.05) on the variability of traits.
SAS 8.0 program was used to analyze the additive and dominance effects of the SNP which has significant associations with the selected traits by REG procedure (additive effect with -1, 0 and 1 representing GG (TT), GA (TG) and AA (GG) genotypes, respectively; dominant effect with 1, -1 and 1 representing GG (TT), GA (TG) and AA (GG) genotypes, respectively.

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smilesir

Òø³æ (СÓÐÃûÆø)

Ô­À´ÊÇÕâ¸öÒâ˼Presented linear mixed model is a family (sire-dam) model and not an animal one which is related to A (the numerator relationship matrix - Henderson, 1973). As far as I know, neither SAS nor SPSS build A matrix directly, so they do not use the animal model. Moreover, SAS and SPSS are operationally similar statistical packages.
9Â¥2012-08-02 17:09:08
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sesame_oil

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2Â¥2012-06-08 22:49:06
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smilesir

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2Â¥: Originally posted by sesame_oil at 2012-06-08 22:49:06
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ÄÇÕâ¸öÎÊÌâAnimal model is not implemented in SPSS or SAS programs unless not mentioned author libraries or functions have been used.
Have association analyses been carried out on direct additive breeding values? ÊÇÏëËµÐ©Ê²Ã´ÄØ£¿
3Â¥2012-06-09 11:29:09
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What is the reason of using both SPSS and SAS programs? Animal model is not implemented in SPSS or SAS programs unless not mentioned author libraries or functions have been used.
Have association analyses been carried out on direct additive breeding values?
ΪʲôÓÃÁËSPSSºÍSASÁ½¸öÈí¼þ£¿SPSSºÍSASÈí¼þÖв¢Ã»ÓÐÖ´ÐÐAnimal model £¨Õâ¿é²»ÊǺÜÃ÷°×£©¡£¶Ôdirect additive breeding values×öû×öÆäËüµÄÏà¹ØµÄ·ÖÎö£¿
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4Â¥2012-06-09 11:52:00
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