Parameter selection overview

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. If you're going to insist on doing it the unsafe way, at the very least double-up any single quotes found in searchStringe. Learn more. How to use sql parameters for a select query? Ask Question.

Asked 8 years, 5 months ago. Active 2 years, 7 months ago. Viewed 31k times. I need to fetch the records based on a 'like' match against a set of records, The below query im using is not working. Does anyone knows what's wrong with the query?

I'm getting the following error while running the above snippet: Must declare the scalar variable " Name". NewBie NewBie 1, 8 8 gold badges 32 32 silver badges 65 65 bronze badges. You have AddWithValue "Name", I tried both ways.

You didn't include the error you were getting. Can you please include it as a part of the question? Active Oldest Votes. What happens this way? AddWithValue " Name", searchString ; If you're going to insist on doing it the unsafe way, at the very least double-up any single quotes found in searchStringe.

Replace "'", "''". Aaron Bertrand Aaron Bertrand k 31 31 gold badges silver badges bronze badges. I'm getting this error "Must declare the scalar variable " Name". That is: sqlCommand. AddWithValue " Name", String. If Not con. Open Then con. AddWithValue " Medicine", txtMedicine.

Text cmd. Message End Try. Code-only answers are discouraged at SO because they lack context and may be not helpful for future readers. Please edit your answer to comment on your solution. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.Also known as feature selection in machine learning, the goal of variable selection is to identify a subset of predictors to simplify models.

This can benefit model interpretation, shorten fitting time, and improve generalization by reducing overfitting. There are many different methods. The one that is appropriate for a given problem depends on the model type, the data, the objective and the theoretical rationale. The parameters package implements a helper that will automatically pick a method deemed appropriate for the provided modelrun the variables selection and return the optimal formulawhich you can then re-use to update the model.

If you are familiar with R and the formula interface, you know of the possibility of including a dot. Curiously, few are aware of the possibility of additionally easily adding all the interaction terms. This can be achieved using the. Length with the iris dataset, included by default in R. And almost none of them is significant….

Which is weirdconsidering that gorgeous R2! I wish I had that in my research…. As you might know, having a model that is too performant is not always a good thing. For instance, it can be a marker of overfitting : the model corresponds too closely to a particular set of data, and may therefore fail to predict future observations reliably. The main issue of the model seems to be the high multicollinearity. This suggests that our model might not be able to give valid results about any individual predictor, nor tell which predictors are redundant with respect to others.

Time to do some variables selection. Although appealing, please note that these automated selection methods are quite criticizedand should not be used in place of theoretical or hypothetical reasons i. For simple linear regressions as above, the selection is made using the step function available in base R. This performs a stepwise selection.Use parameter actions to let your audience change a parameter value through direct interaction with a viz, such as clicking or selecting a mark.

You can use parameter actions with reference lines, calculations, filters, and SQL queries, and to customize how you display data in your visualizations. Parameter actions open up new possibilities for creating summary values and statistics without using calculations. You can configure parameter actions to let users select multiple marks that are automatically aggregated into a single parameter value. For examples of how parameter actions can be used, see Examples of parameter actions.

You need to create parameter actions in Tableau Desktop to make them available for use in Tableau Online and Tableau Server. The parameter referenced in the action must also be referenced in some part of the visualization. You can do this in different ways, such as referencing the parameter in a calculated field or reference line that is used in the viz. You can also build a view that uses a source field that is referred to in the parameter action.

Watch a video : To see related concepts demonstrated in Tableau, watch Parameter Actions Link opens in a new window 7 minutesa free training video. Use your tableau. Create one or more parameters. For more information, see Create Parameters. Optional : Depending on the behavior you want to make available to users for their analysis, you might want to create a calculated field that uses the parameter. For details on creating calculated fields, see Create a calculated field.

For example, if you created a calculated field that uses the parameter, build the view using that calculated field.

parameter selection overview

Or, drag a field that you plan to tie to the parameter into the view. Create a parameter action that uses a parameter. You can create multiple parameter actions for different purposes. The parameter action must refer to the sheet name of the visualization, the parameter name, and the source field that the parameter will be associated with.

Test the parameter action and adjust its settings or other related elements in your visualization as needed to get the behavior you want your audience to experience. Note : It is helpful to understand how you can use parameters in Tableau before you start using them in parameter actions. For more information:. In the Actions dialog box, specify a meaningful name for the action. Select a source sheet or data source. The current sheet is selected by default.

If you select a data source or dashboard you can select individual sheets within it. Hover - Runs when a user hovers the mouse cursor over a mark in the view. Also exposes an option for the action in the mark's tooltip. Select - Runs when a user clicks a mark or selects multiple marks in the view.

Menu - Runs when a user right-clicks macOS: control-clicks a selected mark in the view, then selects an option on the context menu. Under Targetspecify the target parameter and a source field. All parameters in the workbook are available in the Parameter list.

To let your users select multiple marks that get aggregated into a single parameter value, select an aggregation type.

parameter selection overview

If Aggregation is set to Noneand multiple marks that contain different values for the source field are selected, the parameter action will not run. The aggregation that you choose for the parameter action can be different than the aggregation used for that field in the view. For example, you could create a view that uses SUM Salesbut set the Sales source field referenced in the parameter action to use Average for the aggregation.

Note that if you then change the aggregation of the Sales field in the view to AVG Salesyou will need to update the parameter action to reference the Sales field again.

Keep current value - Current parameter value will remain in the view.This topic describes the common uses for Reporting Services report parameters, the properties you can set, and much more.

Report parameters enable you to control report data, connect related reports together, and vary report presentation. Read more about Report Parameters Concepts. Filter paginated report data at the data source by writing dataset queries that contain variables. Filter data from a shared dataset. When you add a shared dataset to a paginated report, you cannot change the query.

In the report, you can add a dataset filter that includes a reference to a report parameter that you create. Filter data from a shared dataset in a SQL Server mobile report. Enable users to specify values to customize the data in a paginated report. For example, provide two parameters for the start date and end date for sales data. Use parameters to relate main reports to drillthrough reports, to subreports, and to linked reports.

When you design a set of reports, you can design each report to answer certain questions. Each report can provide a different view or a different level of detail for related information. To provide a set of interrelated reports, create parameters for the related data on target reports.

parameter selection overview

Customize sets of parameters for multiple users. Create two linked reports based on a sales report on the report server. One linked report uses predefined parameter values for sales persons and the second linked report uses predefined parameter values for sales managers.

Both reports use the same report definition. Send commands to a report server through a URL request, to customize the rendering of a report. Enable users to specify values to help customize the appearance of a report. For example, provide a Boolean parameter to indicate whether to expand or collapse all nested row groups in a table. When you view a report that has parameters, the report viewer toolbar displays each parameter so you can interactively specify values. Parameters pane The report viewer toolbar displays a prompt and default value for each parameter.

You can customize the layout of parameters in the parameters pane. The prompt Select the Date appears next to the text box. To modify the date, type a new date in the text box or use the calendar control. Use the radio buttons to specify True or False. Show or Hide Parameter Area handle On the report viewer toolbar, click this arrow to show or hide the parameters pane. CategoryQuota parameter The parameter CategoryQuota is data type Floatso it takes a numeric value.The field of inferential statistics enables you to make educated guesses about the numerical characteristics of large groups.

The logic of sampling gives you a way to test conclusions about such groups using only a small portion of its members. A population is a group of phenomena that have something in common. The term often refers to a group of people, as in the following examples:. Often, researchers want to know things about populations but do not have data for every person or thing in the population.

If a company's customer service division wanted to learn whether its customers were satisfied, it would not be practical or perhaps even possible to contact every individual who purchased a product.

Instead, the company might select a sample of the population. A sample is a smaller group of members of a population selected to represent the population. In order to use statistics to learn things about the population, the sample must be random. A random sample is one in which every member of a population has an equal chance of being selected. The most commonly used sample is a simple random sample. It requires that every possible sample of the selected size has an equal chance of being used.

A parameter is a characteristic of a population. A statistic is a characteristic of a sample. Inferential statistics enables you to make an educated guess about a population parameter based on a statistic computed from a sample randomly drawn from that population see Figure 1. For example, say you want to know the mean income of the subscribers to a particular magazine—a parameter of a population. This example is one of statistical inference. Previous Quiz Central Limit Theorem.

Next Properties of the Normal Curve. Removing book from your Reading List will also remove any bookmarked pages associated with this title. Are you sure you want to remove bookConfirmation and any corresponding bookmarks? My Preferences My Reading List. Populations, Samples, Parameters, and Statistics. Adam Bede has been added to your Reading List!The Frenchman finally got the better of Jose in May and has realistic hopes of making it two in a row on Saturday night.

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Report Parameters (Report Builder and Report Designer)

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