crime | Predicting crime using taxi rides

I've a spring boot application which run sql on H2 to create database table during startup. The project is in github here.

I've Entity called Movie.java

The sql that I'm running is below and on github here -

I have a crime dataset where every row is one recorded offence that is to be used in an ARIMA time series model.

I'm trying to create a new variable in R containing the initial values of another variable (crime) based on groups (countries) considering the initial period of time observable per group (on panel data framework), my current data looks like this:

And I want it to look like this:

I saw that ddply could make it work this way, but the problem is that it is not longer supported by the latest R updates.

Thank you in advance.

I am currently using the scikit learn module in order to help with a crime prediction problem. I am having an issue batch coding the entire Dataframe that I have with the knn.predict method.

How can I batch code the entire two columns of my Dataframe with the knn.predict() method in order to store in another Dataframe the output?

I have previously asked a question about how to create a variable which counts instances of one ID number appearing in another column (see here). However, I have now realised that I need the new columns to hold a cumulative sum of the number of times the victim (in a particular crime incident) has been recorded as a suspect (in incidents occurring previous to that incident), and one which counts the number of times the suspect (in a particular crime incident) has been recorded as a victim (in incidents occurring previous to that incident). My data is already ordered by date so all I need is a way of cumulatively counting.

Here's a simplified version of my data:

And here is what I want to create:

Note that, where there is an NA, I would like the NA to be preserved. I'm currently trying to work in tidyverse and piping where possible, so I would prefer answers in that kind of format, but I'm open to any solution!

I tried adapting user438383's answer to my previous question but it threw an error (I'm quite new to R so I wasn't sure what this meant!):

I have a simple API that doesn't even display in my web browser.

https://data.police.uk/api/crimes-at-location?date=2017-02&location_id=884227

Others seem to have my issue (here and here), but as a newbie, I still don't fully understand what the issue is, especially in the context of R.

The first post seems to suggest that there's an issue with 'same origin policy', while in the second post, the issue seems to be the way the url is read in.

How can I diagnose the issue to figure out where the problem is, and in R, how could I actually parse such an API?

My current code is below, but it returns empty, just as in my browser:

I have tried searching for an answer to this question but it continues to elude me! I am working with crime data where each row refers to a specific crime incident. There is a variable for suspect ID, and a variable for victim ID. These ID numbers are consistent across the two columns (in other words, if a row contains the ID 424 in the victim ID column, and a separate row contains the ID 424 in the suspect column, I know that the same person was listed as a victim in the first crime and as a suspect in the second crime).

I want to create two new variables: one which counts the number of times the victim (in a particular crime incident) has been recorded as a suspect (in the dataset as a whole), and one which counts the number of times the suspect (in a particular crime incident) has been recorded as a victim (in the dataset as a whole).

Here's a simplified version of my data:

And here is what I want to create:

Note that, where there is an NA, I would like the NA to be preserved. I'm currently trying to work in tidyverse and piping where possible, so I would prefer answers in that kind of format, but I'm open to any solution!

I am currently learning about Room through the Big Nerd Ranch Android Programming textbook. Currently I am able to successfully query for all of the Crimes in my Crimes table, but my query for only one Crime based on UUID always returns null. However, I do know four things that work:

1. I can run "select * from crime where id = '0f14d0ab-9605-4a62-a9e4-5ed26688389b'" in my DB Browser for SQLite and the crime will return successfully in my database.

2. I can run @Query("SELECT * FROM crime WHERE id='0f14d0ab-9605-4a62-a9e4-5ed26688389b'") in my CrimeDao and the crime will return successfully in my app.

3. My CrimeFragment gets crimeId UUID from fragment arguments successfully, based on Log debugging.

4. My CrimeDetailViewModel's loadCrime() gets the crimeId UUID from CrimeFragment successfully.

However, from there, @Query("SELECT * FROM crime WHERE id=:id") always returns null. This means that I must not be passing in :id correctly, but I am unsure where I went wrong.

Here is my setup:

Crime.kt