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How to specify FUN used in by( ) or related apply( ) functions

In a by() fun开发者_Go百科ction, I will use cor (correlation) to be the FUN there. However, I\'d like to setup use=\"complete.obs\" too.[详细]

2023-04-13 07:49 分类：问答
Statistically optimize a genetic algorithms selection operator

I am familiar with the methods of selection for genetic algorithms such as stochastic universal sampling, roulette wheel, tournament and others. However, I realize that these methods are close to rand[详细]

2023-04-13 01:38 分类：问答
Facebook insights not visible

I am having some trouble with facebook insights and I was hoping someone could offer some help on this subj开发者_如何学Goect. The problem I am facing with is that no user (Role) that I have added to[详细]

2023-04-12 17:22 分类：问答
Maximum Likelihood Estimate pseudocode

I need to code a Maximum Likelihood Estimator to estimate the mean and variance of some toy data.I have a vector with 100 samples, created with numpy.random.randn(100). The data should have zero mean[详细]

2023-04-12 14:55 分类：问答
PHP 3D array count unique values

I have a 3D array. I need to extract the following: the number of occurrences of unique items in deepest level array[详细]

2023-04-12 12:35 分类：问答
PHP MySQL Tables Assistance

I have a script which I edited a little bit, on a page, it doesn\'t show the 7 day stats, what could cause this?[详细]

2023-04-12 10:42 分类：问答
Excel Graph - Category and Subcategory grouping

I seldom if ever use excel and have no deep understanding of graphs and graphing-related functions. Having said that...[详细]

2023-04-11 18:33 分类：问答
PHP actuarial-type probability formula

How would I convert the following formula to php to solve for \"p\": (1-p)^365=.80 What I\'m trying to do is calculate the daily probability of an event based on the annual probability. For example[详细]

2023-04-10 19:52 分类：问答
Plot smooth cumulative distribution function using MATLAB

How is it possible to make the following cumulative distribution function (CDF) curve smoother? Here\'s my code, using cdfplot:[详细]

2023-04-10 19:31 分类：问答
Printing all Possible nCr Combinations in Java

I\'m trying to print out all possibilities of nCr, which are the combinations when order doesn\'t matter.So 5C1 there are 5 possibilities: 1开发者_运维技巧 , 2, 3, 4, 5. 5C2 there are 10 possibilities[详细]

2023-04-10 16:47 分类：问答