Matchmaking program in c

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  1. Matchmaking program in c
  2. Your Answer
  3. c++ - Probabilistic matchmaking simulation - Code Review Stack Exchange

Matchmaking program in c

In the common non-statistical sense of the term, for example, the results from one set of 10 runs varied between You appear not to take either of those interpretations, however. If I'm reading your code correctly, you go through the women exactly once , and for each one you keep drawing random men until either you find one that that woman can marry or you have tested every one.

It should be clear that this yields a greater chance for women early in the list to be married, and that order-based bias will at minimum increase the variance of your results.

I find it plausible that it also exerts a net bias toward more marriages, but I don't have a good argument in support. Additionally, as I wrote in comments, you introduce some bias through the way you select random integers. For the sake of argument, let's suppose those values are uniformly distributed over that range.

In fact, this applies to any strictly mathematical transformation you might think of to narrow the range of the rand results. For the salaries, I don't see why you even bother to map them to a restricted range. For selecting random indices into your arrays, however, either for drawing men or for shuffling, you do need a restricted range, so you do need to take care.

The best way to reduce bias in this case is to force the random numbers drawn to come from a range that is evenly divisible by the number of options by re-drawing as many times as necessary to ensure it:. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

Your Answer

Matchmaking program in C? The problem I am given is the following: My code is below, the bulk of the problem is "solved" in the test function: Tom Jacob Tom Jacob 12 4. How many trials are you doing each time? You could also consider assigning uniformly-distributed salaries instead of choosing salaries randomly from a uniform distribution; since the order of the salaries does not matter, these are equivalent in the infinite-population limit. You're doing this using a simulation, but if you want a more direct approach, you could try using Poisson arrival distributions for a closed form answer.


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There are at least two plausible interpretations: The best way to reduce bias in this case is to force the random numbers drawn to come from a range that is evenly divisible by the number of options by re-drawing as many times as necessary to ensure it: John Bollinger John Bollinger I removed rand usage from the salary assigning portion of the program and simply equated salary to i loop iteration counter. Also, the cs50 library I linked only serves to read user input and provide the Boolean data type. Are you John Bollinger, creator of the Bollinger band technical indicator?


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    • TomJacob, I am a different John Bollinger. Suppose further that you wanted to generate numbers between 0 and 2. A No Raw Loops mantra: Same goes for initialization of salaries. The match-finding loop is really std:: Shuffling both arrays seems like doing extra work. I don't see how shuffling just men and inspecting women sequentially would change the result.

    c++ - Probabilistic matchmaking simulation - Code Review Stack Exchange

    There's no reason for an isMarried property: Your Percentage function could be improved. The first observation is that it is unnecessary to accumulate the number of trials, since this is already stored in the std:: Moreover, I would avoid the raw loop here like so:. Readability is improved a lot as well. For more on the topic, see e. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.

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    Probabilistic matchmaking simulation Ask Question. Quaxton Hale Quaxton Hale 2, 29 To name a few: Initialize data in constructors the proper way: Replace magic constants with a named constant that describes its meaning.