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Free Consulting

All UT Austin students, faculty, and staff are eligible for up to one hour of free consulting each week. Our statistical consultants are available for appointments by phone/Skype or in-person, and they can also answer questions over email.

Click to schedule a 30-minute in-person or phone appointment

Or email your questions to: .

(We suggest in-person meetings for your first consultation or for complicated questions)

Please be aware, there are a limited number of consulting slots available and they fill up quickly. You can reserve a spot up to two weeks in advance. If you try to schedule an appointment and there are none available, it is because all spots for next 14 days have been reserved .

If you try to schedule an appointment and there are none available, it is because all spots for next 14 days have been reserved

Click for consultant bios. Consulting hours are subject to change.

Spring 2018 Consulting Schedule (Beginning January 8):

Click to schedule a 30-minute appointment with one of our consultants.

Location: 7.404 GDC (North Building of the Gates Dell Complex). Take the double elevators left of the main entrance to the 7th floor.

7.404 GDC

NOTE: All in-person and phone consulting is BY APPOINTMENT ONLY.


Appointment Cancellations If you need to cancel an appointment, please contact us immediately so that others may take advantage of the unused time slot. You may cancel appointments by either contacting our office at 232-0693 or sending an e-mail to . Please provide your name and the time slot you are canceling.

Appointment Cancellations

E-mail the statistics consultants at .

Most e-mails will be answered within one working day (messages received on Friday will not be answered until Monday). If you have multiple questions or complex questions, please schedule an in-person appointment rather than sending e-mail. If you do send multiple e-mails within a week, it may be several days before we can respond.

Available since 1.0.0.

Time complexity: O(1)

Time complexity:

Increments the number stored at key by one. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.

Note : this is a string operation because Redis does not have a dedicated integer type. The string stored at the key is interpreted as a base-10 64 bit signed integer to execute the operation.

64 bit signed integer

Redis stores integers in their integer representation, so for string values that actually hold an integer, there is no overhead for storing the string representation of the integer.

Integer reply : the value of key after the increment

The counter pattern is the most obvious thing you can do with Redis atomic increment operations. The idea is simply send an command to Redis every time an operation occurs. For instance in a web application we may want to know how many page views this user did every day of the year.

To do so the web application may simply increment a key every time the user performs a page view, creating the key name concatenating the User ID and a string representing the current date.

This simple pattern can be extended in many ways:

The rate limiter pattern is a special counter that is used to limit the rate at which an operation can be performed. The classical materialization of this pattern involves limiting the number of requests that can be performed against a public API.

We provide two implementations of this pattern using , where we assume that the problem to solve is limiting the number of API calls to a maximum of ten requests per second per IP address .

The more simple and direct implementation of this pattern is the following:

Basically we have a counter for every IP, for every different second. But this counters are always incremented setting an expire of 10 seconds so that they'll be removed by Redis automatically when the current second is a different one.

Note the used of wholesale air jordans authentic
and in order to make sure that we'll both increment and set the expire at every API call.


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Since many years DC-power systems in combination with batteries have been used.

In all fields of industry and commerce the need for auxiliary power supplies to protect equipment against power failure is increasing.

Battery assisted DC power systems are used in a wide range of applications, such as, monitoring and controlling of production processes, supply of measurement equipment, telemetry, telecomunication and radio systems. These systems can be found in:

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power range: 300 W to 2400 W

power range:

output voltages: 12 V, 24 V, 48 V, 60 V, 108 to 110 V, 216 to 220 V

output voltages:

Ensuring the continuity of operational processes

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power range: 0,6 kW to 1 MW

output voltages: 18 V to 320 V

output voltages:

highly efficient telecom power supplies

power of the modules: 800 W, 2000 W

power of the modules:

output voltages: programmable

modular DC power systems

power range: 13.5 kW to 67.5 kW

output voltages: 12 V, 24 V, 48 V, 60 V, 110 V, 220 V

power of the module: 13.500 W

power of the module:

power range: 3 kW to 15 kW

output voltages: 12 V, 24 V, 48 V, 60 V, 110 V, 220 V

convection cooled rectifier systems

power of the module: 4 kW

output voltages: 24 V, 48 V, 60 V, 110 V, 220 V

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power range: 0,6 kW to 1 MW

output voltages: 18 V to 320 V

If you have any further questions, do not hesitate to contact us.

If you have any further questions,


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Read more … Emergency power supply for the heavy rail rapid transit system in Washington

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