ranking

问题 In our project, we use search engine, but the result need to be ranked based on each user's interest, similar to recommendation according to users' keyword. If we separate the two system, it would cost a lot time. Is there a better way to combine Search Engine and Recommend System together? Or is there a simple way to customize my ranking strategy to achieve this? 回答1: This is what we were trying to do in our project as well. There are two things while solving this problem - Relevancy vs

问题 I am trying to rank counts, conditioned by two factors in a dataframe. However I would like to have a special treatment of the ties. If two values are equaly, I want them to have an equal tie value. However the next value in the rank should have the next integer rank. Where I'm stuck is when I have the get the dataframe of unique values, conditional on the factor species. (In my actual data set it is conditional on three factors). species <- c(rep("a", 3), rep("b", 4)) df <- data.frame

问题 I am trying to make a conditional ranking in this chart: On the right you can see the total score and ranking from the Match 1,2,3 (sum) on line A and C I have a tie score (3 points and both ranked at 2nd place), I'd like to to add a 2nd and 3rd conditions to determinate the final ranking. If there is a tie in score (both are in same ranking), then to determine who is 2nd and who is 3rd place I want to use the values from the XX's column first. The higher value will win the 2nd place and in a

问题 I've seen some sites where they show two random items from a list, and users pick which one they prefer, and then based on the results of the user preferences, a ranking is generated for the entire data set. Does anyone know what this ranking algorithm is called and how it works? Thank you. 回答1: I believe you're referring to the ELO rating system. 回答2: A simple implementation would be to always choose two random items for the comparison and give the preferred item a point. Then rank in order

问题 I've seen some sites where they show two random items from a list, and users pick which one they prefer, and then based on the results of the user preferences, a ranking is generated for the entire data set. Does anyone know what this ranking algorithm is called and how it works? Thank you. 回答1: I believe you're referring to the ELO rating system. 回答2: A simple implementation would be to always choose two random items for the comparison and give the preferred item a point. Then rank in order

问题 I have seen: how do I find the closest value to a given number in an array? How do I find the closest array element to an arbitrary (non-member) number?. These relate to vanilla python and not pandas. If I have the series: ix num 0 1 1 6 2 4 3 5 4 2 And I input 3, how can I (efficiently) find? The index of 3 if it is found in the series The index of the value below and above 3 if it is not found in the series. Ie. With the above series {1,6,4,5,2}, and input 3, I should get values (4,2) with

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . `id` int(11) NOT NULL, `ip` text NOT NULL, `song` text NOT NULL, `vote` int(11) NOT NULL I have created a voting system and I would like to print the songs with more votes ... how do I do it? Thank you 回答1: I think you need to try for counting total votes for the song SELECT SUM(vote)as VOTECOUNT,

问题 Today I want to get a help in creating scores per user in my database. I have this query: SELECT r1.id, r1.nickname, r1.fecha, r1.bestia1, r1.bestia2, r1.bestia3, r1.bestia4 r1.bestia5 FROM reporte AS r1 INNER JOIN ( SELECT nickname, MAX(fecha) AS max_date FROM reporte GROUP BY nickname ) AS latests_reports ON latests_reports.nickname = r1.nickname AND latests_reports.max_date = r1.fecha ORDER BY r1.fecha DESC that's from a friend from this site who helped me in get "the last record per user

问题 Let's say I have an list: [4, 5, 2, 1] I need to rank these and have the output as: [3, 4, 2, 1] If two have the same ranking in the case: [4, 4, 2, 3] then the rankings should be averaged -> [3.5, 3.5, 1, 2] EDIT Here rank stands for position of number in a sorted list. If there are multiple numbers with same value, then rank of each such number will be average of their positions. 回答1: Probably not the most efficient, but this works. rank takes a sorted list and an item, and figures out the

问题 I have a VBA code to return a Crew ID for a job completed, the total number of jobs that crew did, how many days that crew was working, and then return the average number of jobs per day. They are in no particular order and all of these categories are adjacent to each other in the excel spreadsheet. In a column next to these other categories, I want to write a VBA code to assign each row a value (1 to 10, since there are 10 crews) based on who has the highest number of jobs per day. I have