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[实际应用] AMOS内建 bootstrap提示出错 [推广有奖]

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zengyuhx 发表于 2012-1-6 10:36:23 |显示全部楼层 |坛友微信交流群

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为什么我用bootstrap方法,提示出错呢?during the analysis of a bootstrap sample,an attempt was made to compute the correlation between two variables,one of whose estimated variances failed to be positive.This attempt was made because "Standardized estimates"in the "Analysis Properties"window was checked,or because the Standardized method was used.
本文来自: 人大经济论坛 LISREL、AMOS等结构方程模型分析软件 版,详细出处参考: https://bbs.pinggu.org/forum.php?mod=viewthread&tid=752158&page=4&from^^uid=2844086
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关键词:Bootstrap Bootstra boots amos boot 经济 论坛 fromuid because between

有福有德 在职认证  发表于 2012-10-23 10:23:37 |显示全部楼层 |坛友微信交流群
很可能是变量间的共线性导致的
所有模型都是错的

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cl6822184 发表于 2013-11-1 23:54:09 |显示全部楼层 |坛友微信交流群
https://bbs.pinggu.org/thread-1311860-1-1.html
可以查看这里,有很详细的解释

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cl6822184 发表于 2013-11-1 23:54:56 |显示全部楼层 |坛友微信交流群
Resolving the problem


AMOS is functioning as it was designed to do when it encounters a nonpositive variance during bootstrapping and you are estimating standardized estimates. The program can't calculate some standardized estimates because it would require either taking the square root of a negative variance, or dividing by a zero standard deviation.

Admittedly, there is something alarming about the message "An error occurred..." because it sounds like a program error occurred, but that is not the case.

It is true that the probability of this error message occurring can be reduced by reducing the number of bootstrap samples. There are a couple of other solutions that we think are better:

1. Don't ask for standardized estimates if you don't really need them. Of course this is not a useful solution of the main purpose of the bootstrapping is to estimate standard errors or confidence intervals for standardized estimates.

2. Click View->Analysis Properties->Bootstrap, and put an integer larger than 1 in the Bootfactor box. Say you put "4" in the Bootfactor box. Then the program will quadruple the sample size by using each observation 4 times. If you have a sample of 200, then you end up with a sample of 800, where each observation in the original sample of 200 appears 4 times in the sample of 800. Assuming that standard errors are inversely proportional to the square root of sample size, using a Bootfactor of 4 will have the effect of cutting the standard errors in half, so the program corrects for this by doubling each standard error before displaying it. With a larger sample, the estimates in the bootstrap samples will tend to be closer to the estimates in the original sample. If the original sample does not have nonpositive variance estimates it is less likely that the bootstrap samples will have nonpositive variance estimates. Of course if the original sample does have nonpositive variance estimates, a large Bootfactor values makes it more likely that the bootstrap samples will have nonpositive variance estimates. The online help gives a little more information on Bootfactor. (Look for "Bootfactor Method" in the online help index.)

If you don't request standardized estimates, Amos does not check for negative variance estimates during bootstrapping. Even though negative variance estimates don't have any meaningful interpretation that we know of, they don't create any numeric problems as long as you don't try to compute standardized estimates
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经云客 发表于 2017-8-12 13:08:39 |显示全部楼层 |坛友微信交流群
cl6822184 发表于 2013-11-1 23:54
Resolving the problem
Thank for your advice,it is so useful for me!

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iAweomse 学生认证  发表于 2017-8-26 20:07:09 |显示全部楼层 |坛友微信交流群
cl6822184 发表于 2013-11-1 23:54
Resolving the problem
You really did me a favor!

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liulingyuan1 发表于 2018-3-24 15:32:36 |显示全部楼层 |坛友微信交流群
cl6822184 发表于 2013-11-1 23:54
Resolving the problem
under this way, amos do not report the mean in the standardized regression weights. Could you tell me the reason for this? thank you very much!

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chenxj1105 发表于 2018-10-15 19:28:32 |显示全部楼层 |坛友微信交流群

RE: AMOS内建 bootstrap提示出错

我想知道这个问题解决了吗?我也遇到了同样的问题,按照建议的做法操作还是不行。

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lmz666666 发表于 2020-7-3 11:04:48 |显示全部楼层 |坛友微信交流群
没错,把Bootstrap factor 1改成4 ,结果就出来了,很神奇

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Wa_sai 发表于 2022-11-15 15:54:22 |显示全部楼层 |坛友微信交流群
chenxj1105 发表于 2018-10-15 19:28
我想知道这个问题解决了吗?我也遇到了同样的问题,按照建议的做法操作还是不行。
这个问题解决了吗?我也遇到了同样的问题,按照建议的做法操作还是不行。而且结果显示ok,但是view text 是虚的点不开。

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