Its not easy for us to estimate or take into account demand, coupled with the production limitations it makes its a guestimate at times.

我们很难预估需求，加上产能的限制，有时候只能粗略估算。

youdao

All right now, now what I'd like you to do is just sort of do a guestimate in your mind of the percentage errors you might have made overall in these estimates, and I'll come back and ask you in a minute.

好了,现在,现在我希望你们,在脑海中估算下你们预测的百分误差,你们可以就总值做一个估算,我会在一分钟后问你们

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Others use more complex formulas, but in essence all these tests are an attempt to guestimate how much income retirees can take each year without outliving their assets.

FORBES: "Do-it-Yourself" retirement income for business owners: the capitalization test - Part 1